Assignee
FOERSTER INST DR FRIEDRICH
DE·28 granted patents·514 citations·filing 1975–1999
Top patents by PatentIndex Score
28 records- 0180US3988665AEddy current test coil assembly using printed circuit conductor meansFOERSTER INST DR FRIEDRICH·Filed 1975·Granted Oct 26, 1976·38 cites·2 claims
- 0277US5550468AMethod and apparatus for adjusting the operating diameter of a probe in a rotating testing headFOERSTER INST DR FRIEDRICH·Filed 1994·Granted Aug 27, 1996·42 cites·18 claims
- 0377US4445088AMethod and arrangement for evaluating a defect signal by comparing the ratio of maximum signal rise and maximum signal magnitude to a predetermined valueFOERSTER INST DR FRIEDRICH·Filed 1981·Granted Apr 24, 1984·53 cites·4 claims
- 0472US4954777ADevice for defect testing of non-ferromagnetic test samples and for ferromagnetic inclusionsFOERSTER INST DR FRIEDRICH·Filed 1988·Granted Sep 4, 1990·46 cites·1 claims
- 0565US6097190AMethod and device for locating and identifying search objects concealed in the ground, particularly plastic minesFOERSTER INST DR FRIEDRICH·Filed 1997·Granted Aug 1, 2000·34 cites·35 claims
- 0665US4314203ATest arrangement for the non-destructive testing of metallic test piecesFOERSTER INST DR FRIEDRICH·Filed 1979·Granted Feb 2, 1982·17 cites·12 claims
- 0765US4016487AArrangement of eddy current scanning coilsFOERSTER INST DR FRIEDRICH·Filed 1976·Granted Apr 5, 1977·21 cites·8 claims
- 0862US5245307ASearch coil assembly for electrically conductive object detectionFOERSTER INST DR FRIEDRICH·Filed 1992·Granted Sep 14, 1993·43 cites·4 claims
- 0955US4881031AEddy current method and apparatus for determining structural defects in a metal object without removing surface films or coatingsFOERSTER INST DR FRIEDRICH·Filed 1988·Granted Nov 14, 1989·24 cites·5 claims
- 1055US4331920AMagnetic or magneto-inductive materials tester with improved processing circuitFOERSTER INST DR FRIEDRICH·Filed 1979·Granted May 25, 1982·17 cites·5 claims
- 1151US6005392AMethod for the operation and for the evaluation of signals from an eddy current probe and device for performing the methodFOERSTER INST DR FRIEDRICH·Filed 1997·Granted Dec 21, 1999·35 cites·25 claims
- 1250US5184070AEddy-current defect test instrument with multiple test probes and one distance probeFOERSTER INST DR FRIEDRICH·Filed 1991·Granted Feb 2, 1993·25 cites·16 claims
- 1347US5638000AMethod and apparatus for electro-magnetically testing elongated objectsFOERSTER INST DR FRIEDRICH·Filed 1994·Granted Jun 10, 1997·13 cites·21 claims
- 1446US5517114AApparatus for testing elongated objects having a radially adjustable rotary probeFOERSTER INST DR FRIEDRICH·Filed 1994·Granted May 14, 1996·14 cites·16 claims
- 1544US4447778AApparatus for securing storage tape on a test piece during magnetographic testingFOERSTER INST DR FRIEDRICH·Filed 1981·Granted May 8, 1984·9 cites·4 claims
- 1642US4117403ASingle magnetic stray field sensor whose signals are differently attenuated in two channels and then comparedFOERSTER INST DR FRIEDRICH·Filed 1977·Granted Sep 26, 1978·9 cites·12 claims
- 1741US4387338AMethod and apparatus for testing a metallic workpiece by inducing eddy currents thereinFOERSTER INST DR FRIEDRICH·Filed 1980·Granted Jun 7, 1983·9 cites·20 claims
- 1840US5068612AElectromagnetic shield for an inductive search coil assemblyFOERSTER INST DR FRIEDRICH·Filed 1990·Granted Nov 26, 1991·19 cites·1 claims
- 1937US6344740B1Guide device for testing elongated objectsFOERSTER INST DR FRIEDRICH·Filed 1999·Granted Feb 5, 2002·7 cites·28 claims
- 2037US5509320AMethod and apparatus for testing elongated objects having a non-circular cross-sectionFOERSTER INST DR FRIEDRICH·Filed 1994·Granted Apr 23, 1996·6 cites·10 claims
- 2136US4063159AAdjusting device for magnetic probesFOERSTER INST DR FRIEDRICH·Filed 1976·Granted Dec 13, 1977·4 cites·8 claims
- 2235US5576967AMethod and apparatus for monitoring and ensuring product qualityFOERSTER INST DR FRIEDRICH·Filed 1993·Granted Nov 19, 1996·4 cites·21 claims
- 2335US4566585ASelf-centering driver for oblong materialFOERSTER INST DR FRIEDRICH·Filed 1983·Granted Jan 28, 1986·8 cites·9 claims
- 2435US4562349AMethod and apparatus for scanning the surface of an objectFOERSTER INST DR FRIEDRICH·Filed 1983·Granted Dec 31, 1985·5 cites·6 claims
- 2534US4297636AMagnet and probe mounting means on a rotating head of magnetic defect testing apparatusFOERSTER INST DR FRIEDRICH·Filed 1979·Granted Oct 27, 1981·6 cites·18 claims
- 2632US3980884AProcess and apparatus for determining the concentration of a suspensionFOERSTER INST DR FRIEDRICH·Filed 1975·Granted Sep 14, 1976·4 cites·13 claims
- 2727US4519243AApparatus for the nondestructive testing of elongated test specimens by magnetic techniquesFOERSTER INST DR FRIEDRICH·Filed 1983·Granted May 28, 1985·1 cites·8 claims
- 2823US4881036APhase shift compensation for metal detection apparatusFOERSTER INST DR FRIEDRICH·Filed 1987·Granted Nov 14, 1989·1 cites·6 claims
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →