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Class Information
Number: 324
Name: Electricity: measuring and testing >
Description: This is the residual home for all subject matter, not elsewhere classified, relating to the measuring, testing (or sensing) of electric properties, (e.g., determining ground resistivity, determining frequency of an alternating current, determining kilowatt hour demand), or the measuring, testing or sensing of nonelectric properties by electric means (e.g., determining moisture, a nonelectric property, by measuring conductance with a resistance bridge; determining speed, a nonelectric property by use of an electric tachometer).










Class Number Class Name No. of Patents
324/452

A material property using electrostatic phenomenon

159
324/455

Corona induced

64
324/456

For flaw detection

64
324/454

Frictionally induced

52
324/453

In a liquid

81
324/451

A material property using thermoelectric phenomenon

31
324/66

Conductor identification or location (e.g., phase identification)

305
324/67

Inaccessible (at test point) conductor (e.g., buried in wall)

359
324/71.1

Determining nonelectric properties by measuring electric properties

692
324/71.3

Beam of atomic particles

116
324/71.2

Erosion

141
324/71.4

Particle counting

239
324/71.5

Semiconductors for nonelectrical property

190
324/71.6

Superconductors

43
324/800

Divining rods

1
324/403

Electric lamp or discharge device

42
324/404

Cathode-ray tube

56
324/414

Electric lamp

124
324/405

Vacuum tube

8
324/408

Circuit for making diverse test

2
324/406

Plural tubes in the testing circuit

2
324/413

Shock testing

1
324/407

Testing circuit for diverse-type tube

5
324/409

Testing discharge space characteristic (e.g., emission)

20
324/410

With application of current or potential to the discharge control means

15
324/411

Pulsating or alternating current or potential for the discharge control means

5
324/412

Pulsating or alternating current for the anode

4
324/160

Electrical speed measuring

273
324/178

Including "event" sensing means

70
324/179

Magnetic field sensor

85
324/180

Mechanically actuated switch

7
324/177

Including motor current or voltage sensor

66
324/176

Including object displacement varied variable circuit impedance

25
324/163

Including speed analog electrical signal generator

93
324/164

Eddy current generator type (e.g., tachometer)

52
324/165

With direction indicator

114
324/166

Including speed-related frequency generator

469
324/173

Including magnetic detector

434
324/174

Permanent magnet type

685
324/168

Including periodic switch

34
324/169

In ignition system

43
324/170

High voltage speed signal type

10
324/171

With extent-of-travel indicator

36
324/175

Including radiant energy detector

135
324/167

Including rotating magnetic field actuated indicator

64
324/172

Including synchronized recording medium

16
324/161

Speed comparing means

145
324/162

With acceleration measuring means

67
324/425

Electrolyte properties

247
324/426

Using a battery testing device

693
324/435

Having particular meter scale or indicator

123
324/436

Including oscillator in measurement circuit

51
324/437

Including probe structure

57
324/433

To compare battery voltage with a reference voltage

441
324/427

To determine ampere-hour charge capacity

436
324/428

Including an integrating device

128
324/432

To determine battery electrolyte condition

116
324/430

To determine internal battery impedance

263
324/429

To determine load/no-load voltage

214
324/434

To determine plural cell condition

257
324/431

With temperature compensation of measured condition

118
324/439

Using a conductivity determining device

333
324/443

Having a bridge circuit

30
324/446

Having conductance probe structure

139
324/449

With axially arranged electrodes

65
324/448

With concentric electrodes

44
324/447

With movable or adjustable electrode

40
324/445

Having inductance probe structure

72
324/440

Which includes a dropping mercury cell

6
324/441

Which includes a temperature responsive element

85
324/442

Which includes an oscillator

74
324/444

Which includes current and voltage electrodes

122
324/450

Which includes particular cell container structure

141
324/438

Using a ph determining device

166
324/415

Electromechanical switching device

153
324/424

Circuit breaker

202
324/418

Relay

135
324/419

Reed switch

19
324/420

To evaluate contact chatter

15
324/421

To evaluate contact resistance

38
324/423

To evaluate contact response time

47
324/422

To evaluate contact sequence of operation

35
324/417

Thermostat switch

22
324/416

Voltage regulator

34
324/457

Electrostatic field

319
324/458

Using modulation-type electrometer

147
324/500

Fault detecting in electric circuits and of electric components

424
324/506

Combined with a flashlight

16
324/507

With fuse testing attachment

21
324/512

For fault location

238
324/527

By applying a test signal

332
324/531

At fault site

42
324/528

Tracing test signal to fault location

103
324/529

Using a magnetic field sensor

170
324/530

Using an electric field sensor

67
324/532

Using time measuring

98
324/533

Of reflected test signal

246
324/519

By capacitance measuring

172
324/520

By frequency sensitive or responsive detection

181
324/521

By phase sensitive or responsive detection

125
324/534

By reflection technique

230
324/525

By resistance or impedance measuring

360
324/526

Using a bridge circuit

38
324/536

By spark or arc discharge

344
324/535

By time measuring

109
324/522

By voltage or current measuring

823
324/523

Of an applied test signal

217
324/524

Polarity responsive

57
324/513

Where component moves while under test

14
324/514

By exposing component to liquid or gas while under test

55
324/515

Using a particular sensing electrode

48
324/516

Metal chain

8
324/518

Metal pellets or beads

6
324/517

Wire bristles

8
324/502

In an ignitor or detonator

33
324/503

In vehicle wiring

196
324/505

Combined with window glass

16
324/504

With trailer

44
324/555

Instruments and devices for fault testing

281
324/556

Having a lamp or light indicator

200
324/511

Of electrically operated apparatus (power tool, appliance, machine, etc.)

160
324/509

Of ground fault indication

411
324/510

Of electrically operated apparatus (power tool, appliance, machine, etc.)

161
324/537

Of individual circuit component or element

1254
324/545

Armature or rotor

146
324/548

Capacitor

191
324/763

Dut including test circuit

1087
324/538

Electrical connectors

437
324/550

Fuse

111
324/551

Insulation

305
324/552

Bushing

32
324/553

Oil

21
324/554

Sheet material

21
324/770

Liquid crystal device test

415
324/772

Motor or generator fault tests

445
324/539

Multiconductor cable

334
324/541

For insulation fault

121
324/542

Having a light or sound indicator

109
324/540

With sequencer

53
324/771

Power supply test

142
324/549

Resistor

60
324/543

Single conductor cable

170
324/544

For insulation fault

130
324/750

System sensing fields adjacent device under test (dut)

378
324/753

Using electro-optic device

211
324/751

Using electron beam probe

399
324/752

Using light probe

338
324/765

Test of semiconductor device

3698
324/766

With barrier layer

124
324/768

Bipolar transistor

65
324/767

Diode

217
324/769

Field effect transistor

386
324/546

Winding or coil

189
324/547

Transformer

135
324/764

With identification of dut

68
324/754

With probe elements

3069
324/762

Cantilever

445
324/756

Contact confirmation

152
324/755

Internal of or on support for device under test (dut)

960
324/761

Pin

940
324/758

Probe alignment or positioning

971
324/757

Probe contact enhancement

424
324/759

With recording of test results on dut

53
324/760

With temperature control

797
324/501

Using radiant energy

240
324/508

With electric power receptacle for line wire testing

140
324/557

For insulation fault of noncircuit elements

179
324/559

Where a moving sensing electrode scans a stationary element under test

60
324/558

Where element moves while under test

45
324/600

Impedance, admittance or other quantities representative of electrical stimulus/response relationships

181
324/601

Calibration

608
324/629

Distributive type parameters

93
324/630

Plural diverse parameters

26
324/647

Using a comparison or difference circuit

100
324/648

With a bridge circuit

31
324/632

Using particular field coupling type (e.g., fringing field)

148
324/633

Using resonant frequency

173
324/635

To determine dimension (e.g., distance or thickness)

86
324/634

To determine water content

68
324/636

With a resonant cavity

193
324/637

Using transmitted or reflected microwaves

411
324/638

Scattering type parameters (e.g., complex reflection coefficient)

209
324/642

Where energy is reflected (e.g., reflectometry)

397
324/645

Having standing wave pattern

41
324/644

To determine dimension (e.g., distance or thickness)

224
324/646

To determine reflection coefficient

86
324/643

To determine water content

140
324/639

Where energy is transmitted through a test substance

271
324/641

To determine insertion loss

27
324/640

To determine water content

188
324/631

Using wave polarization (e.g., field rotation)

39
324/649

Lumped type parameters

122
324/653

For figure of merit or q value

26
324/652

Of a resonant circuit

81
324/658

Using capacitive type measurement

617
324/663

Where a material or object forms part of the dielectric being measured

530
324/672

By comparison or difference circuit

84
324/673

Including a bridge circuit

23
324/674

By frequency signal response, change or processing circuit

95
324/675

Including a tuned or resonant circuit

44
324/671

To determine dimension (e.g., dielectric thickness)

229
324/664

To determine water content

232
324/665

By comparison or difference circuit

49
324/666

Including a bridge circuit

18
324/667

By frequency signal response, change or processing circuit

92
324/668

Including a tuned or resonant circuit

49
324/669

With compensation means

37
324/670

For temperature variations

48
324/686

With a capacitive sensing means

507
324/687

Having fringing field coupling

142
324/688

Including a guard or ground electrode

210
324/690

Including a probe type structure

408
324/689

To determine water content

146
324/679

With comparison or difference circuit

270
324/680

Including a bridge circuit

36
324/684

With compensation means

109
324/685

For temperature variation

56
324/681

With frequency signal response, change or processing circuit

137
324/682

Including a tuned or resonant circuit

71
324/659

With loss characteristic evaluation

45
324/683

With phase signal processing circuit

100
324/676

With pulse signal processing circuit

114
324/678

Including charge or discharge cycle circuit

397
324/677

Including r/c time constant circuit

90
324/661

With variable distance between capacitor electrodes

328
324/662

To determine dimension (e.g., thickness or distance)

507
324/660

With variable electrode area

186
324/654

Using inductive type measurement

139
324/656

Including a comparison or difference circuit

46
324/657

Using a bridge circuit

19
324/655

Including a tuned or resonant circuit

82
324/650

Using phasor or vector analysis

125
324/651

With a bridge circuit

13
324/691

Using resistance or conductance measurement

386
324/722

Device or apparatus determines conductivity effects

80
324/723

Potentiometer

29
324/724

Using a probe type structure

143
324/705

With comparison or difference circuit

132
324/706

Including a bridge circuit

103
324/720

With compensation means

75
324/721

For temperature variation

85
324/707

With frequency response, change or processing circuit

68
324/708

Including a tuned or resonant circuit

30
324/692

With living organism condition determination using conductivity effects

152
324/693

With object or substance characteristic determination using conductivity effects

329
324/697

For interface

31
324/699

To determine dimension (e.g., distance or thickness)

104
324/700

Including corrosion or erosion

220
324/698

To determine oil qualities

173
324/694

To determine water content

198
324/695

Where the object moves while under test

37
324/696

With a probe structure

147
324/701

Where the object moves while under test

53
324/709

With phase signal processing circuit

51
324/710

With pulse signal processing circuit

43
324/712

Including a digital or logic circuit

47
324/711

Including r/c time constant circuit

64
324/702

With radiant energy effects

30
324/703

Including heating

66
324/704

With ratio determination

42
324/719

With semiconductor or ic materials quality determination using conductivity effects

303
324/713

With voltage or current signal evaluation

590
324/715

Including a particular probing technique (e.g., four point probe)

218
324/718

To detect a flaw or defect

178
324/716

To determine dimension (e.g., distance or thickness)

150
324/717

To determine material composition

101
324/714

Including a potentiometer

57
324/612

Parameter related to the reproduction or fidelity of a signal affected by a circuit under test

91
324/620

Distortion

87
324/625

Dissymmetry or asymmetry

12
324/621

Envelope delay

29
324/623

Harmonic

73
324/624

Intermodulation

36
324/626

Nonlinearity

26
324/622

Phase

60
324/613

Noise

213
324/614

Signal to noise ratio or noise figure

73
324/627

Shielding effectiveness (se)

147
324/628

Circuit interference (e.g., crosstalk) measurement

117
324/615

Transfer function type characteristics

112
324/616

Gain or attenuation

58
324/617

Response time or phase delay

119
324/619

Selective type characteristics

39
324/618

Transient response or transient recovery time (e.g., damping)

31
324/727

Piezoelectric crystal testing (e.g., frequency, resistance)

103
324/726

Transformer testing (e.g., ratio)

57
324/725

Using a particular bridge circuit

133
324/602

With auxiliary means to condition stimulus/response signals

48
324/603

For excitation

112
324/604

Including marker signal generator circuit

10
324/605

For response signal evaluation or processing

135
324/607

Including a conversion (e.g., a->d or d-> a) process

141
324/608

Including a ratiometric function

48
324/606

Including a signal comparison circuit

112
324/609

For sensing

81
324/610

Including a bridge circuit

49
324/611

Including a remote type circuit

75
324/378

Internal-combustion engine ignition system or device

114
324/402

Apparatus for coupling a measuring instrument to an ignition system

153
324/383

By simulating or substituting for a component under test

10
324/388

Coil

99
324/385

Distributor

9
324/387

Condenser

2
324/386

Dwell (i.e., cam angle)

13
324/380

Electronic ignition system

102
324/382

With capacitor discharge circuit

26
324/381

With magnetically controlled circuit

12
324/391

Ignition timing

66
324/392

Using a pulse signal technique

65
324/393

In situ testing of spark plug

69
324/397

By shorting the plug to ground to indicate spark plug condition

11
324/398

With air gap in ground circuit

3
324/395

Using an illuminating device to indicate spark plug condition

21
324/399

Wherein a measured electric quantity indicates spark plug condition

155
324/396

With an air gap in series with spark plug to indicate spark plug condition

6
324/394

With cathode-ray tube display

6
324/390

Low or high tension lead

16
324/389

Magneto

5
324/400

Spark plug removed or tested in a test fixture

6
324/401

Using a pressure chamber

4
324/384

Using plural tests in a conventional ignition system

60
324/379

With analysis of displayed waveform

96
324/200

Magnetic

110
324/214

By paramagnetic particles

18
324/216

Flaw testing

49
324/215

With pattern enhancing additive

9
324/202

Calibration

354
324/226

Combined

409
324/203

Curie point determination

12
324/263

Current through test material forms test magnetic field

67
324/207.11

Displacement

241
324/207.26

Approach or retreat

407
324/207.12

Compensation for measurement

535
324/207.22

Having particular sensed object

565
324/207.13

Having particular sensor means

431
324/207.14

Diverse sensors

94
324/207.2

Hall effect

988
324/207.15

Inductive

414
324/207.16

Electrically energized

507
324/207.19

Differential bridge circuit

85
324/207.18

Differential type (e.g., lvdt)

200
324/207.17

Separate pick-up

502
324/207.21

Magnetoresistive

885
324/207.24

Linear

791
324/207.23

Plural measurements (e.g., linear and rotary)

188
324/207.25

Rotary

1864
324/204

Fluid material examination

252
324/223

Hysteresis loop curve display or recording

38
324/222

Hysteresis or eddy current loss testing

67
324/260

Magnetic field detection devices

588
324/261

With support for article

91
324/210

Magnetic information storage element testing

277
324/212

Dynamic information element testing

267
324/211

Memory core storage element testing

16
324/213

Magnetic recording medium on magnetized object records object field

34
324/219

Magnetic sensor within material

101
324/220

Sensor supported, positioned, or moved within pipe

299
324/221

Borehole pipe testing

69
324/262

Magnetic test structure elements

504
324/244

Magnetometers

495
324/250

Electronic tube or microwave magnetometers

28
324/256

Energized movable sensing coil magnetometers

22
324/258

Fixed coil magnetometer

96
324/251

Hall plate magnetometers

372
324/259

Movable magnet or magnetic member interacts with magnetic field

61
324/257

Moving coil magnetometer

18
324/247

Nonparallel plural magnetic sensors

225
324/244.1

Optical

266
324/245

Plural sensor axis misalignment correction

43
324/253

Saturable core magnetometers

197
324/255

Peak voltage type

22
324/254

Second harmonic type

31
324/252

Semiconductor type solid-state or magnetoresistive magnetometers

1025
324/248

Superconductive magnetometers

394
324/249

Thin film magnetometers

203
324/246

With means to align field sensor with magnetic field sensed

43
324/206

Movable random length material measurement

33
324/205

Permanent magnet testing

35
324/227

Plural tests

184
324/217

Railroad rail flaw testing

14
324/218

Rail joint cutout

6
324/209

Stress in material measurement

214
324/201

Susceptibility

47
324/225

With compensation for test variable

523
324/228

With means to create magnetic field to test material

425
324/234

Electrically energized nonforce type sensor

161
324/238

Material flaw testing

300
324/235

Noncoil type

241
324/236

Oscillator type

269
324/237

Material flaw testing

88
324/239

Induced voltage-type sensor

406
324/240

Material flaw testing

417
324/241

Opposed induced voltage sensors

67
324/242

Plural sensors

274
324/243

Plural sensors

219
324/232

Plural magnetic fields in material

315
324/229

Thickness measuring

189
324/230

Layer or layered material

196
324/231

With backing member

34
324/233

With phase sensitive element

262
324/224

With temperature control of material or element of test circuit

79
324/76.11

Measuring, testing, or sensing electricity, per se

578
324/76.12

Analysis of complex waves

214
324/76.13

Amplitude distribution

112
324/76.14

Radiometer (e.g., microwave, etc.)

60
324/76.16

With counter

43
324/76.17

With integrator

38
324/76.15

With sampler

120
324/76.18

With slope detector

10
324/76.19

Frequency spectrum analyzer

322
324/76.21

By fourier analysis

150
324/77.11

Nonscanning

67
324/76.33

Correlation

68
324/76.34

With space discharge device

2
324/76.28

Digital filter

51
324/76.35

With delay line

85
324/76.29

With filtering

104
324/76.31

Parallel filters

67
324/76.32

With space discharge device

1
324/76.36

With optics

75
324/76.37

Bragg cell

32
324/76.22

Real-time spectrum analyzer

99
324/76.26

Scanning-panoramic receiver

52
324/76.27

With particular sweep circuit

56
324/76.23

With mixer

136
324/76.24

With sampler

157
324/76.25

With slope detector

14
324/76.38

With sampler

52
324/98

Balancing (e.g., known/unknown voltage comparison, bridge, rebalancing)

40
324/99R

Automatic

49
324/99D

Digital voltmeters

204
324/100

With recording

12
324/156

Casings

177
324/121R

Cathode ray (e.g., magic eye)

310
324/121E

Magic eye indicators

1
324/157

Combined

116
324/103R

Demand, excess, maximum or minimum (e.g., separate meters for positive and negative power, peak voltmeter)

166
324/103P

Peak voltmeters

146
324/104

Thermal (e.g., actuation)

25
324/150

Eccentrically pivoted coil

20
324/137

Eddy current rotor (e.g., a.c. integrating wattmeter)

40
324/138

With phase adjustment

8
324/109

Electrostatic attraction or piezoelectric

72
324/92

Fluid (e.g., thermal expansion)

13
324/93

Conductive field (e.g., mercury)

5
324/94

Electrolytic

36
324/76.39

Frequency of cyclic current or voltage (e.g., cyclic counting etc.)

200
324/76.52

By phase comparison

116
324/76.69

Current output proportional to frequency

18
324/76.74

Deviation measurement

53
324/76.55

Digital output

190
324/76.62

With counter

119
324/76.64

Plural

10
324/76.63

Using register

17
324/76.61

With memory

31
324/76.56

With microwave frequency detection

22
324/76.59

With multiplexing

33
324/76.58

With sampler

46
324/76.65

With space discharge device

5
324/76.57

With tone detection

27
324/76.71

Nulling circuit

5
324/76.72

Qualitative output

18
324/76.66

With capacitive energy storage

23
324/76.67

With space discharge device

5
324/76.54

With delay line

94
324/76.68

With filtering

74
324/76.53

With phase lock

119
324/76.73

With saturable device

4
324/76.51

By tuning (e.g., to resonance,etc.)

28
324/76.41

Frequency comparison, (e.g., heterodyne, etc.)

135
324/76.47

Digital output

189
324/76.48

With counter

146
324/76.44

With filtering

89
324/76.45

Bandpass

40
324/76.46

Plural

13
324/76.43

With plural mixers

38
324/76.42

With sampler

71
324/76.75

Having inductive sensing

13
324/76.49

Tuned mechanical resonator (e.g., reed, piezocrystal, etc.)

40
324/76.76

With space discharge device

4
324/122

Gaseous discharge (e.g., spark gap voltmeter)

70
324/125

Inertia control, instrument damping and vibration damping

33
324/117R

Magnetic saturation (e.g., in field or in amplifier)

654
324/117H

Hall effect

388
324/110

Meter protection or fraud combatting

204
324/118

Modulator/demodulator

59
324/139

Motor-driven, time-controlled or oscillating (e.g., ratchet)

5
324/101

Non-rebalancing bridge

2
324/132

Nonlinear (e.g., thyrite)

109
324/133

Nonquantitative (e.g., hot-line indicator, polarity tester)

527
324/76.77

Phase comparison (e.g., between cyclic pulse voltage and sinusoidal current, etc.)

267
324/76.83

Analog output

38
324/76.82

Digital output

211
324/90

Electrodynamometer instrument

1
324/76.79

Feedback control, electrical

61
324/76.81

Feedback control, mechanical

7
324/86

Polyphase (e.g., phase angle, phase rotation or sequence)

94
324/76.78

Quadrature sensing

47
324/91

Synchroscope type

3
324/85

With frequency conversion

23
324/87

With nonlinear device (e.g., saturable reactor, rectifier), discharge device (e.g., gas tube) or lamp

6
324/88

Cathode ray

22
324/89

Space discharge control means (e.g., grid)

1
324/84

With waveguide (e.g., coaxial cable)

18
324/143

Plural active motor elements (e.g., for two crossed pointers)

47
324/140R

Plural inputs (e.g., summation, ratio)

92
324/140D

Ratio

37
324/141

Voltamperes (real or reactive)

101
324/142

Watts

659
324/114

Plural meters (e.g., plural movements in one case)

75
324/115

Plural ranges, scales or registration rates

368
324/116

With register (e.g., discount type, demand penalty)

80
324/129

Polepiece (e.g., split) admits nonunitary input conductor

11
324/107

Polyphase

150
324/108

Positive, negative or zero sequence

28
324/113

Recording

72
324/130

Self-calibration

186
324/131

Suppressed zero

14
324/105

Thermal (e.g., compensation)

79
324/106

Actuation

72
324/102

Transient or portion of cyclic

125
324/96

Using radiant energy

778
324/97

Light beam type (e.g., mirror galvanometer, parallax-free scale)

36
324/123R

With amplifier or space discharge device

128
324/123C

Feedback amplifiers

52
324/124

Inverted amplifier

16
324/134

With commutator or reversing or pulsating switch (e.g., d.c. watt-hour meter)

11
324/135

Oscillating

2
324/126

With coupling means (e.g., attenuator, shunt)

439
324/128

Selective filter

23
324/127

Transformer (e.g., split core admits conductor carrying unknown current)

733
324/144

With electromagnetic field (e.g., dynamometer)

40
324/147

Soft iron vane

8
324/145

Solenoid plunger type

9
324/146

With permanent magnet (e.g., field, vane)

81
324/151R

With permanent magnet

20
324/152

Drag magnet

10
324/151A

Permanent magnet core

19
324/149

With probe, prod or terminals

191
324/119

With rectifier (e.g., a.c. to d.c.)

119
324/153

With register

4
324/136

With rolling wheel or ball (e.g., transmission, integrating)

2
324/154R

With rotor (e.g., filar suspension, zero set, balancing)

42
324/154PB

Pointer and bearing details

27
324/155

With pivot (e.g., internal friction compensation, anticreep)

13
324/111

With storage means for voltage or current (e.g., condenser banks)

85
324/112

Tape, sheet (e.g., disk) or wire (e.g., magnetic) storage

9
324/120

With voltage or current conversion (e.g., d.c. to a.c., 60 to 1000)

99
324/95

With waveguide or long line

262
324/158.1

Miscellaneous

3073
324/323

Of geophysical surface or subsurface in situ

198
324/330

By aerial survey

61
324/331

For magnetic field detection

46
324/345

By magnetic means

182
324/346

Within a borehole

154
324/326

For small object detection or location

567
324/329

Using movable transmitter and receiver

277
324/327

Using oscillator coupled search head

75
324/328

Of the beat frequency type

26
324/324

Including borehole fluid investigation

77
324/325

To determine fluid entry

14
324/347

Using electrode arrays, circuits, structure, or supports

178
324/354

Coupled to artificial current source

35
324/357

Including separate pickup of generated fields or potentials

102
324/363

By varying the path of current flow

10
324/364

Using frequency variation

8
324/366

For well logging

113
324/372

Between spaced boreholes

12
324/368

Cased borehole

72
324/367

Using a pad member

68
324/373

Using current focussing means

45
324/374

Including a pad member

37
324/375

Including plural current focussing arrays

38
324/371

Using plural fields

24
324/370

Using surface current electrodes

21
324/369

While drilling

82
324/365

Offshore

111
324/360

Using a pulse-type current source

13
324/362

To measure induced polarization

25
324/361

With mechanical current reversing means

3
324/359

With nonelectrode pickup means

19
324/358

With three electrodes

15
324/355

Within a borehole

72
324/356

While drilling

35
324/348

For detecting naturally occurring fields, currents, or potentials

75
324/349

Of the telluric type

13
324/350

Including magneto-telluric type

45
324/351

Within a borehole

53
324/352

Combined with artificial source measurement

2
324/353

With fluid movement or pressure variation

24
324/344

With radiant energy or nonconductive-type receiver

74
324/332

With radiant energy or nonconductive-type transmitter

48
324/334

With separate pickup

162
324/335

Employing multiple frequencies

68
324/337

To detect return wave signals

144
324/336

To detect transient signals

40
324/338

Within a borehole

422
324/339

By induction logging

384
324/341

To measure dielectric constant

59
324/340

To measure susceptibility

9
324/342

Using a toroidal coil

32
324/343

Using angularly spaced coils

79
324/333

Within a borehole

98
324/376

Of subsurface core sample

60
324/377

For magnetic properties

14
324/300

Particle precession resonance

658
324/306

Determine fluid flow rate

519
324/318

Spectrometer components

3248
324/322

Electronic circuit elements

1533
324/319

Polarizing field magnet

650
324/320

With homogeneity control

510
324/321

Sample holder structure

313
324/301

Using a magnetometer

116
324/302

To determine direction

31
324/307

Using a nuclear resonance spectrometer system

2605
324/310

By scanning sample frequency spectrum

94
324/312

By spectrum storage and analysis

335
324/308

Including a test sample and control sample

112
324/313

Including polarizing magnetic field/radio frequency tuning

114
324/309

To obtain localized resonance within a sample

3412
324/314

With conditioning of transmitter signal

257
324/315

With sample resonant frequency and temperature interdependence

104
324/311

With signal decoupling

99
324/316

Using an electron resonance spectrometer system

147
324/317

Including a test sample and control sample

33
324/304

Using optical pumping or sensing device

100
324/305

Having particular optical cell structure

28
324/303

Using well logging device

524
324/73.1

Plural, automatically sequential tests

1078
324/74

Testing and calibrating electric meters (e.g., watt-hour meters)

205
324/75

By stroboscopic means

3
324/72

Testing potential in specific environment (e.g., lightning stroke)

456
324/72.5

Voltage probe

772
324/459

Using ionization effects

113
324/464

For analysis of gas, vapor, or particles of matter

309
324/466

Using a filter

18
324/469

Using a radioactive substance

23
324/465

Using electronegative gas sensor

25
324/467

Using test material desorption

3
324/468

Using thermal ionization

58
324/470

Using thermionic emission

16
324/460

For monitoring pressure

93
324/463

Using a magnetic field

23
324/461

Using a radioactive substance

4
324/462

Using thermionic emissions

29
 
 
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