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Class Information
Number: 324/234
Name: Electricity: measuring and testing > Magnetic > With means to create magnetic field to test material > Electrically energized nonforce type sensor
Description: Subject matter wherein the apparatus to sense and indicate the sensing of the magnetic field modified by the material includes a sensor which requires an electrical current to pass therethrough, and which senses and indicates the magnetic field other than by a force measurement.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 5010298 |
Variable inductance displacement measuring device with slidable metal sleeve and ferrite bead core |
Apr. 23, 1991 |
| 5003262 |
Eddy current system with interference signal rejection |
Mar. 26, 1991 |
| 4983914 |
Proximity measurement by inductive sensing using single turn UHF energized coil sensors incorporated into cutter head of sheep shearing device |
Jan. 8, 1991 |
| 4963118 |
Method and apparatus for coin sorting and counting |
Oct. 16, 1990 |
| 4947117 |
Nondestructive detection of an undesirable metallic phase, T.sub.1, during processing of aluminum-lithium alloys |
Aug. 7, 1990 |
| 4943771 |
Differential eddy current sensor measuring apparatus for use with movable mirror segments |
Jul. 24, 1990 |
| 4926123 |
Precision variable pitch compensation winding for displacement transducer |
May. 15, 1990 |
| 4906925 |
Apparatus for detecting conductive materials in a moving flow |
Mar. 6, 1990 |
| 4893079 |
Method and apparatus for correcting eddy current signal voltage for temperature effects |
Jan. 9, 1990 |
| 4891591 |
Nonintrusive method and apparatus for monitoring the cure of polymeric materials |
Jan. 2, 1990 |
| 4883264 |
Bill disbursing system |
Nov. 28, 1989 |
| 4878019 |
Electrical sensing system for measuring ferrous particles within a fluid with temperature compensation circuit |
Oct. 31, 1989 |
| 4875567 |
Coin validation device |
Oct. 24, 1989 |
| 4864236 |
Wire inhomogeneity detector having a core with opposing pole pieces and guide pieces adjacent the opposing pole pieces |
Sep. 5, 1989 |
| 4845429 |
Inductance divider sensor |
Jul. 4, 1989 |
| 4843259 |
Process for the non-contacting detection of eddy current-induced bodies, particularly metal objects, as well as to sensors based on the process |
Jun. 27, 1989 |
| 4837509 |
Method and apparatus for measuring diameter of a steel reinforcement rod embedded in concrete and the thickness of the concrete overlayer |
Jun. 6, 1989 |
| 4835471 |
Measuring device with oscillation circuit including an exciting coil and tuned to a specific resonant frequency, for determining content of magnetizable substances in materials |
May. 30, 1989 |
| 4764725 |
Apparatus for detecting counterfeit currency using two coils to produce a saturating magnetic field |
Aug. 16, 1988 |
| 4746858 |
Non destructive testing for creep damage of a ferromagnetic workpiece |
May. 24, 1988 |
| 4731578 |
Electrical sensing system for measuring ferrous particles within a fluid |
Mar. 15, 1988 |
| 4719422 |
Eddy-current probes especially for the scanning of non-flat profiled surfaces |
Jan. 12, 1988 |
| 4667158 |
Linear position transducer and signal processor |
May. 19, 1987 |
| 4629984 |
Ferromagnetic eddy current probe apparatus |
Dec. 16, 1986 |
| 4603295 |
Two-headed DC magnetic target proximity sensor |
Jul. 29, 1986 |
| 4593244 |
Determination of the thickness of a coating on a highly elongated article |
Jun. 3, 1986 |
| 4584529 |
Method and apparatus for discriminating between genuine and suspect paper money |
Apr. 22, 1986 |
| 4580096 |
Isotachophoresis analyzer for inductively detecting boundaries between adjoining substances having different conductivities |
Apr. 1, 1986 |
| 4580097 |
Electronic proximity sensor which is responsive to induced resistance |
Apr. 1, 1986 |
| 4555664 |
Process and device for inspecting a surface in simulated manner which differs from the real surface scanning by an eddy current transducer |
Nov. 26, 1985 |
| 4502006 |
Displacement measuring transducers and their use for sensing vehicle suspension displacements |
Feb. 26, 1985 |
| 4488113 |
Magnetic bridge proximity sensor |
Dec. 11, 1984 |
| 4485344 |
Apparatus for electromagnetically measuring the ovalization of a ferromagnetic pipe |
Nov. 27, 1984 |
| 4450405 |
Alloy testing apparatus using eddy current conductivity probe |
May. 22, 1984 |
| 4446427 |
Measuring and control device using the damping effect of a resistive effect element on the inductor of a tuned circuit |
May. 1, 1984 |
| 4361218 |
Coin testing apparatus |
Nov. 30, 1982 |
| 4306455 |
Apparatus for checking the geometrical features of mechanical pieces |
Dec. 22, 1981 |
| 4290017 |
Apparatus and method for nondestructive evaluation of surface flaws in conductive materials |
Sep. 15, 1981 |
| 4283680 |
Electrical bridge balancing circuit |
Aug. 11, 1981 |
| 4276539 |
Vehicle detection systems |
Jun. 30, 1981 |
| 4239415 |
Method of installing magnetic sensor loops in a multiple lane highway |
Dec. 16, 1980 |
| 4219774 |
Automatic eddy current surface probe for fastener holes |
Aug. 26, 1980 |
| 4150314 |
Level amplitude output rotary speed transducer |
Apr. 17, 1979 |
| 4092586 |
Temperature-sensing circuit |
May. 30, 1978 |
| 4074249 |
Magnetic detection means |
Feb. 14, 1978 |
| 4061968 |
Process of and apparatus for non-destructive eddy current testing involves the suppression of displayed lobes corresponding to fault parameters to be eliminated from the display |
Dec. 6, 1977 |
| 4050013 |
Magnetic field probe which measures switching current of magnetic element at moment the element switches as measure of external field |
Sep. 20, 1977 |
| 4050010 |
Apparatus utilizing a test surface with a magnetic flux gap for detecting dimensional disconformities of manufactured elements |
Sep. 20, 1977 |
| 4047591 |
Air gun monitoring and synchronizing method and apparatus |
Sep. 13, 1977 |
| 4048556 |
Method for evaluating electrode consumption rate |
Sep. 13, 1977 |
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