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Class Information
Number: 338
Name: Electrical resistors >
Description: GENERAL STATEMENT OF THE CLASS SUBJECT MATTER:










Class Number Class Name No. of Patents
338/1

Coherer type

3
338/221

Detachable plug-type resistor unit

41
338/278

Edgewise coiled helical strip resistance element

10
338/207

Element and base permanently folded or rolled

1
338/204

Element in layers piled or stacked between terminals

45
338/205

With intervening conducting layer

13
338/206

Expanded metal type

15
338/209

Extensible

2
338/210

Flexible or folding

48
338/213

Beaded

9
338/214

Cable type

138
338/211

Element coated on flexible base

44
338/212

Tape or sheet

95
338/223

Granular or powdered element

36
338/225

Carbon particles

34
338/224

Granular or powdered mixtures

27
338/296

Helical or wound resistance element

30
338/298

Compound helix or winding

9
338/302

Element coiled on cylindrical or prismatic core

47
338/303

In helical groove on core

17
338/301

Element coiled on flat or ribbon base

18
338/300

Element forms a coating

11
338/304

Element on frame or support

38
338/305

Element extends in or through openings or grooves in frame or support

26
338/297

Flat spiral winding

16
338/299

Plural supported helices or windings

32
338/66

Ignition interference suppressor type

32
338/216

In coaxial transmission line or wave guide

33
338/220

In detachable electrical connector

55
338/219

In or on lamp socket or base

18
338/226

Incased, embedded, or housed

53
338/228

Casing extends through plate

7
338/262

Casing or housing formed as a coating

24
338/263

Helical or wound element

4
338/264

Element coiled on a core

11
338/265

Terminal or leads at one end of core

3
338/266

Terminal surrounds element and/or core

2
338/256

Casing or housing formed in plural layers external to element

13
338/257

One layer a coating

9
338/275

Casing or housing formed on and hardened on resistor (e.g., molded)

68
338/232

Casing or housing readily openable and/or separable from element

18
338/233

Elongated casing or housing with plug, disc, or cap at end

10
338/252

Element embedded or enclosed in groove or recess

39
338/253

With filling hardened in situ

9
338/243

Element in insulation with outer metallic sheath

26
338/245

Entire insulation or sheath formed as a coating

3
338/244

Insulation coated on conducting liner

3
338/250

Insulation formed and hardened in situ (e.g., molded)

8
338/247

Plural part sheath

5
338/248

Insulation formed and hardened in situ (e.g., molded)

10
338/249

Parts formed as flat sheets

9
338/251

Sheath embraces or folds over insulation

5
338/246

With insulation and sheath external and internal to element

1
338/238

Element inpowdered insulation with outer metallic sheath

63
338/239

Plural elements or resistors

18
338/242

Shape of sheath

16
338/240

Terminals or leads adjacent

21
338/241

Sheath only outside looped element

13
338/254

Flattened resistance element between flat layers

57
338/255

Layers coalesced or fused together

13
338/267

Helical or wound element

10
338/269

Casing or housing formed on and hardened on resistor (e.g., molded)

19
338/270

Element coiled on a core

28
338/268

Preformed sleeve engaging over element

18
338/231

In liquid

7
338/230

Metal casing or housing cast around element

9
338/260

Plural resistors

73
338/261

Helical or wound element

7
338/229

Probe type

44
338/258

Resistance element formed as a coating on interior of casing or housing

8
338/271

Terminal forms casing or housing

21
338/273

Terminal or lead extends into end of elongated casing or housing

39
338/274

With sealing plug, disc or cap

45
338/276

Terminal or lead extends through casing or housing wall

45
338/272

Terminal or lead surrounds and secured to casing or housing

18
338/234

With gaseous or vacuum spacing between element and casing or housing

34
338/235

Plural elements or resistors

21
338/236

Spacing of uniform thickness over length of element

13
338/237

Hermetically sealed

38
338/227

With resistance value indicator

5
338/259

Wound, braided, or woven casing or housing

6
338/68

Mechanically variable (e.g., rheostat)

30
338/87

Contact adjustably inserted into resistance element (e.g., penetrating type)

2
338/88

Powdered element

1
338/114

Deformable

191
338/115

Element in piled or stacked layers

8
338/70

In or on lamp socket

8
338/71

Resistor surfaces pressed together (e.g., compressible type)

4
338/73

Resistor with contact angularly slidable on element

6
338/74

Resistor with contact rectilinearly slidable on element

7
338/72

Resistor with intervening connector between contact and element (e.g., taps)

6
338/76

Interchangeable resistors of different resistance value

1
338/80

Liquid resistance element

41
338/82

Adjustable insulating barrier between electrodes

10
338/81

Electrode separable from liquid element for switching

6
338/86

Level of liquid element adjustable on electrodes (e.g., electrodes move up and down in element)

15
338/83

Variable electrode separation

9
338/85

Electrode rotatable

2
338/84

Plural ganged electrodes

4
338/89

Mathematical function (e.g., sine-cosine potentiometer)

22
338/91

With mechanical converter

2
338/90

With slab or card-type resistance element

7
338/118

Movable contact electrically adjustable over length of resistance element

51
338/120

Additional resistor adjustably shunts part of resistance element (e.g., varifunction type

6
338/122

Coarse and fine resistance elements

5
338/123

Plural elements and plural contacts

14
338/124

Contacts interlinked (e.g., lost motion type)

1
338/136

Contact clamped on resistance element

3
338/143

Contact moves along turns of helical resistance element

8
338/144

Contact lifts element from core

0
338/145

Helical resistance element moves

1
338/147

Resistor formed as a flat spiral

2
338/149

With contact stop

5
338/146

With helical collector parallel to helical element

0
338/148

With helical screw for moving the contact

2
338/153

Contact operated by pedal or treadle

60
338/155

Contact rocks along element or taps

4
338/157

Contact rolls along element or taps

10
338/158

Contact rolls rectilinearly

6
338/160

Contact slides along in contact with element

112
338/162

Contact angularly slidable

234
338/169

Contact pressure adjustable

2
338/164

Hermetically sealed housing

53
338/167

Spring-loaded contact

40
338/174

With collector ring

101
338/175

Ring, a shaft-bearing

10
338/170

With contact biasing spring on contact arm or carrier

22
338/165

With elongated rectilinear resistance element

7
338/168

With flexible lead-in to contact

7
338/163

With knob forming casing or covering

59
338/171

With plural contact portions

60
338/166

With removable actuating shaft or key

24
338/172

With switching

69
338/173

Contact separable from resistance element

11
338/176

Contact rectilinearly slidable

123
338/178

Contact separable from element for switching

15
338/177

Contact surrounds resistor

4
338/180

Screw-operated

33
338/181

Screw, a fine-adjustment

1
338/183

With collector bar

28
338/182

With contact lock

7
338/179

With series switch

18
338/161

With element casing open over contact track

14
338/138

Element tapered

13
338/142

Element forms a coating

11
338/141

Helical or wound

4
338/139

Portion of element shorted

5
338/140

With intervening connector between contact and element (e.g., taps)

5
338/137

Plural contacts adjustable over single resistance element

14
338/128

Plural

145
338/130

Ganged

14
338/133

Rectilinearly operated

4
338/132

Resistors in tandem along rotary shaft or coupling

19
338/131

Resistors individually adjustable

16
338/134

Individually operated concentric shaft type

17
338/129

Sequentially operated

7
338/150

Resistance element moves

17
338/152

With knob mounting or enclosing the element

12
338/151

With liquid contact

2
338/125

Unitary movable contact electrically bridges plural resistance elements

15
338/127

Contact rotates between circularly arranged elements or taps

10
338/126

Elements or taps in parallel

10
338/154

With a flexible conductive strip separating the movable contact and the resistance element or taps

9
338/119

With contact position indicating lamp

17
338/159

With heat conducting or distributing path

10
338/184

With housing

118
338/185

With intervening connector between contact and element (e.g., taps)

30
338/190

Angularly movable contact

31
338/192

Resistance element enclosed

2
338/193

Enclosure formed on and hardened on element

4
338/191

With switch

14
338/186

Connector formed as severed helical turns or as comb teeth

1
338/194

Rectilinearly movable contact

12
338/187

With arc suppressor

3
338/188

With collector bar or ring

14
338/189

With magnetic holder for controller arm

2
338/156

With liquid contact

2
338/121

With nonlinearity correction

1
338/135

With zero setting or phasing

9
338/69

Musical instrument playing key actuated

29
338/77

Plug boxes

2
338/92

Resistance element adjustably short-circuited

37
338/93

Compressible spring type

3
338/94

Liquid contact

12
338/96

Spring contact strip progressively pressed along element

12
338/97

Unitary movable contact electrically bridges resistance portions

6
338/95

With intervening structure between element and short-circuiting means (e.g., taps)

9
338/195

Resistance value varied by removing or adding material

306
338/117

Slidable coextensive helical and linear contacts

4
338/99

Surfaces pressed together (e.g., compressible type)

162
338/100

Granular

14
338/101

Pile type

20
338/112

Contact surface area of piles variable

7
338/108

Pedal- or treadle-operated

20
338/102

With contactor moving along pile

0
338/107

With electromagnetic holder

1
338/103

With electromagnetic operator (e.g., electric motor)

4
338/104

Force applied at both ends of pile

4
338/105

With diaphragm-type biasing spring

0
338/106

With initial pressure adjustment

1
338/109

With initial pressure adjustment

1
338/111

With intervening conducting structure

4
338/113

With resilient pressure-applying linkage

12
338/110

With switch actuated by resistor actuator

4
338/78

With current reversing (e.g., reversing rheostat)

3
338/116

With electromagnetic operator (e.g., electric motor)

10
338/79

With element winding and/or unwinding

3
338/199

With housing

72
338/98

With motion or vibration damping means (e.g., dashpots)

5
338/196

With resistor actuator position indicator

48
338/75

With resistor cleaner

5
338/197

With support

30
338/198

With switch actuated by resistor actuator

73
338/200

With switch

79
338/201

Switch connects plural elements in parallel

12
338/208

Mesh, woven, or braided resistance element

47
338/334

Miscellaneous

77
338/50

Mounted on wheels or vehicle

31
338/202

Movable contact structure

103
338/12

Movable magnet actuates resistor through housing or partition

15
338/333

Particular configuration and/or dimension

102
338/295

Plural resistance elements connected by a jumper or spacer

97
338/48

Plural separate diverse resistors

30
338/203

Readily severable into independent resistors

44
338/11

Reflector directs heat on element

0
338/321

Resistance element cores and frames

17
338/13

Resistance value responsive to a condition

130
338/25

Ambient temperature

330
338/26

Cable or tape type (e.g., fire-detecting cable)

33
338/27

Liquid contact or element

8
338/31

Mechanically adjustable or variable

2
338/28

Probe type

243
338/29

Mechanically adjustable or variable

5
338/30

Terminal forms casing or housing

21
338/20

Current and/or voltage (e.g., ballast resistor)

337
338/24

Indirectly heated

35
338/22R

Thermistor type

1146
338/23

Indirectly heated

71
338/22SD

Semiconductor

305
338/21

Voltage surge-responsive or lightning arrester type

450
338/33

Float actuator

68
338/36

Fluid- or gas pressure-actuated

67
338/41

Bellows or capsule

10
338/40

Bourdon tube

4
338/42

Diaphragm

228
338/38

Liquid resistance element or contact

21
338/39

Piston

18
338/37

Vehicle tire inflation

2
338/47

Force-actuated

169
338/34

Gas, vapor, or moisture absorbing or collecting

412
338/35

Humidity

145
338/43

Gravity stabilized or inertia actuator

7
338/45

Centrifugal

1
338/44

Liquid resistance element or contact

4
338/46

Pendulum

12
338/32R

Magnetic field or compass (e.g., hall effect type)

578
338/32H

Hall effect

250
338/32S

Superconductors

38
338/15

Photoconductive (e.g., light sensitive)

84
338/18

Infrared radiation

60
338/17

Plural resistance elements (e.g., mosaic)

20
338/19

With transparent housing

4
338/16

With vibration control

1
338/14

Plural conditions

26
338/7

Resistance value temperature-compensated

63
338/8

Temperature-compensated actuator

11
338/9

With additional compensating resistor or resistance element

46
338/10

Filament or wire resistance elements

4
338/279

Ribbon resistance element bent or curved on flat side

26
338/282

Helical or wound

17
338/280

Zigzag or sinuous

66
338/281

Element includes integral stiffening structure

26
338/49

Shunt type

53
338/2

Strain gauge type

241
338/5

Dynamometer type

153
338/6

Extensometer type

39
338/4

Fluid- or gas pressure-actuated

389
338/3

With temperature compensation

48
338/217

Tapered element

46
338/218

Helical or wound

14
338/306

With base extending along resistance element

120
338/314

Resistance element and base formed in layers

283
338/307

Resistance element and/or terminals printed or marked on base

283
338/308

Resistance element coated on base

624
338/309

Terminal coated on

510
338/310

Resistance element extends through base

29
338/311

Resistance element mounted in a groove in base

42
338/313

Terminal embraces base

71
338/312

Terminal extends in or through base

69
338/60

With capacity-reducing

10
338/53

With cooling gas or liquid circulation

32
338/54

Element granular, powdered, or stacked between terminals

5
338/57

Vented or ventilating casing or housing

14
338/58

Ventilated helical or zigzag element

33
338/55

With cooling liquid circulation

23
338/56

Liquid resistance element circulates

8
338/67

With diverse nonelectrical device (e.g., mechanical or chemical)

11
338/64

With electrical shield

17
338/65

Mechanically variable resistor

0
338/51

With heat dissipating projections (e.g., vanes)

57
338/52

Granular, powdered, or transversely stacked resistance element

7
338/59

With heat-storing

11
338/61

With inductance-reducing

36
338/62

Helical or wound element

9
338/63

Bifilar

3
338/222

With liquid element

10
338/315

With mounting or supporting means

68
338/316

Compensates for or permits resistor

70
338/318

Extending between supports

49
338/319

Plural resistors

52
338/320

Plural resistors

207
338/317

Threading or projecting through the support

31
338/277

With protecting structure spaced from element or terminal

20
338/215

With switch

40
338/322

With terminal

117
338/324

Diverse terminals

68
338/331

Resistance element surrounds terminal

25
338/328

Terminal and resistance element disposed in flat layers

168
338/330

Terminal and resistance element integral

49
338/327

Terminal coated on resistance element

78
338/332

Terminal embraces or surrounds resistance element

171
338/323

Terminal tapped on resistance element

25
338/326

Terminals adjacent (e.g., looped resistor)

21
338/329

Welded or soldered

81
338/325

With three or more terminals

115
338/DIG.1

Worm gear drive

16
338/283

Zigzag or sinuous resistance element

54
338/287

Compound or multiple zigzag

33
338/288

Element includes conductive jumpers or spacers

11
338/294

Cylindrical

30
338/285

Element extends along groove in base

12
338/292

Element forms a coating

28
338/289

Element includes conductive jumpers or spacers

17
338/284

Element includes integral stiffening structure

14
338/290

Element projects in or through an opening or a slot in a support or frame

25
338/286

Helical

8
338/293

Planar

67
338/291

With transverse element stiffening or reinforcing rod or strip

5
 
 
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