Inventor · disambiguated record
Frederick J. Jeffers
Also filed as: JEFFERS FREDERICK · JEFFERS FREDERICK J · JEFFERS FREDERICK JOHN
56 granted patents·3 pending applications·1,409 citations·filing 1974–2012
99Inventor score
Top patents by PatentIndex Score
59 records- 0196US7762380B2Currency discrimination system and methodCUMMINS ALLISON CORP·Filed 2007·Granted Jul 27, 2010·80 cites·51 claims
- 0296US4413296AThin film magnetoresistive headEASTMAN KODAK CO·Filed 1981·Granted Nov 1, 1983·56 cites·3 claims
- 0395US6372338B1Spherical magnetic particles for magnetic recording mediaEASTMAN KODAK CO·Filed 1998·Granted Apr 16, 2002·35 cites·20 claims
- 0494US8684157B2Currency discrimination system and methodCUMMINS ALLISON CORP·Filed 2012·Granted Apr 1, 2014·16 cites·18 claims
- 0594US8322505B2Currency discrimination system and methodFREEMAN JAY D·Filed 2010·Granted Dec 4, 2012·44 cites·23 claims
- 0693US4164770AThin film magnetoresistive headEASTMAN TECHNOLOGY·Filed 1977·Granted Aug 14, 1979·40 cites·4 claims
- 0791US5418458AApparatus and method for authentication of documents printed with magnetic inkEASTMAN KODAK CO·Filed 1993·Granted May 23, 1995·146 cites·16 claims
- 0890US4388662AThin film magnetoresistive headEASTMAN KODAK CO·Filed 1981·Granted Jun 14, 1983·35 cites·9 claims
- 0989US5260653AThin film very high sensitivity magnetoresistive magnetometer having temperature compensation and simple domain stabilityEASTMAN KODAK CO·Filed 1992·Granted Nov 9, 1993·75 cites·1 claims
- 1088US5698839AMagnetically encodable card having magnetic pigment uniformly dispersed in plasticEASTMAN KODAK CO·Filed 1995·Granted Dec 16, 1997·125 cites·12 claims
- 1188US5119025AHigh-sensitivity magnetorresistive magnetometer having laminated flux collectors defining an open-loop flux-conducting pathEASTMAN KODAK CO·Filed 1991·Granted Jun 2, 1992·69 cites·4 claims
- 1287US4992699AX-ray phosphor imaging screen and method of making sameEASTMAN KODAK CO·Filed 1989·Granted Feb 12, 1991·34 cites·15 claims
- 1384US5121258AApparatus for anhysteretic duplication of a flexible magnetic diskEASTMAN KODAK CO·Filed 1991·Granted Jun 9, 1992·37 cites·8 claims
- 1484US4318136AMagnetic recording apparatus and methodSPIN PHYSICS INC·Filed 1980·Granted Mar 2, 1982·26 cites·7 claims
- 1581US4683508AMagneto-resistive head with reduced thermal noiseEASTMAN KODAK CO·Filed 1985·Granted Jul 28, 1987·33 cites·6 claims
- 1679US5717967AMethod and camera for writing hand-generated information on a filmstrip in the cameraEASTMAN KODAK CO·Filed 1996·Granted Feb 10, 1998·16 cites·11 claims
- 1779US5398145ATracking control apparatus including a servo head having a tapered transducing gapEASTMAN KODAK CO·Filed 1994·Granted Mar 14, 1995·35 cites·8 claims
- 1878US4277806AMagnetic recording using recording media having temperature dependent coercivityEASTMAN TECHNOLOGY·Filed 1979·Granted Jul 7, 1981·18 cites·15 claims
- 1977US5757183ADevice to shield a magnetic field in a given planeEASTMAN KODAK CO·Filed 1996·Granted May 26, 1998·42 cites·10 claims
- 2075US7295107B2Ferromagnetic detection pillarMEDNOVUS INC·Filed 2005·Granted Nov 13, 2007·12 cites·13 claims
- 2172US5705924AHall effect sensor for detecting an induced image magnet in a smooth materialEASTMAN KODAK CO·Filed 1997·Granted Jan 6, 1998·32 cites·21 claims
- 2271US5689184ALarge scale metallic object detectorEASTMAN KODAK CO·Filed 1996·Granted Nov 18, 1997·48 cites·5 claims
- 2370US4306215AThin magnetoresistive headSPIN PHYSICS INC·Filed 1979·Granted Dec 15, 1981·13 cites·8 claims
- 2469US5714747AMagnetic card and reader systemEASTMAN KODAK CO·Filed 1996·Granted Feb 3, 1998·42 cites·5 claims
- 2569US5613712AMagnetic fingerprint for secure document authenticationEASTMAN KODAK CO·Filed 1995·Granted Mar 25, 1997·36 cites·5 claims
- 2669US5353169AContact duplication of magnetically recorded information without the use of a transfer fieldEASTMAN KODAK CO·Filed 1991·Granted Oct 4, 1994·19 cites·9 claims
- 2769US4633344AUnambiguously tracking a data track in response to signals derived from the track data itselfEASTMAN KODAK CO·Filed 1985·Granted Dec 30, 1986·16 cites·10 claims
- 2868US5239435ALaminated magnetic record/playback head with thin films of high permeability material spaced apart by very thin films of insulating magnetic material for high bit densities and data transfer ratesEASTMAN KODAK CO·Filed 1991·Granted Aug 24, 1993·17 cites·16 claims
- 2967US7239134B2Screening method and apparatusMEDNOVUS INC·Filed 2006·Granted Jul 3, 2007·8 cites·21 claims
- 3065US4908724ADual gap cross-field magnetic recording head with single gap signal excitationEASTMAN KODAK CO·Filed 1988·Granted Mar 13, 1990·13 cites·3 claims
- 3165US4754354AFerrite film insulating layer in a yoke-type magneto-resistive headEASTMAN KODAK CO·Filed 1986·Granted Jun 28, 1988·13 cites·9 claims
- 3263US5552589APermanent magnet assembly with MR element for detection/authentication of magnetic documentsEASTMAN KODAK CO·Filed 1994·Granted Sep 3, 1996·20 cites·7 claims
- 3360US5543911AMethod of currency or document validation by use of an anti-counterfeiting magnetic viewing stripEASTMAN KODAK CO·Filed 1994·Granted Aug 6, 1996·25 cites·6 claims
- 3454US5717381ACopyright protection for photos and documents using magnetic elementsEASTMAN KODAK CO·Filed 1995·Granted Feb 10, 1998·21 cites·13 claims
- 3554US3935578AThermo-magnetic image recording methods and apparatusEASTMAN KODAK CO·Filed 1974·Granted Jan 27, 1976·8 cites·11 claims
- 3651US5644228APermanent magnet assembly with MR and DC compensating biasEASTMAN KODAK CO·Filed 1994·Granted Jul 1, 1997·17 cites·6 claims
- 3749US5533759AMethod of currency or document validation by use of a temperature sensitive magnetic patternEASTMAN KODAK CO·Filed 1994·Granted Jul 9, 1996·13 cites·6 claims
- 3849US2008281187A1Ferromagnetic threat detection method apparatusMEDNOVUS INC·Filed 2007·Application pending·0 cites
- 3948US5532584AMR sensor including calibration circuit wherein signals are averaged for determining a correction factor and pole pieces are shaped to reduce field in gap therebetweenEASTMAN KODAK CO·Filed 1994·Granted Jul 2, 1996·13 cites·5 claims
- 4048US4106028AMethod and apparatus for forming magnetic images by piezoelectric coupling between an optical image and a magnetostrictive imaging componentEASTMAN TECHNOLOGY·Filed 1977·Granted Aug 8, 1978·5 cites·9 claims
- 4147US7239223B2Enhancement magnetizer for magnetic resonance imaging screeningMEDNOVUS INC·Filed 2004·Granted Jul 3, 2007·3 cites·8 claims
- 4244US4123790AMagnetic head with mechanically isolated thin film sensorEASTMAN TECHNOLOGY·Filed 1977·Granted Oct 31, 1978·4 cites·3 claims
- 4342US5554932AMeasurement of a saturation magnetic flux density through use of a rotating permanent magnetEASTMAN KODAK CO·Filed 1993·Granted Sep 10, 1996·9 cites·19 claims
- 4441US5218493AMagnetic recording apparatus including a magnetic head having a curved media-contact surface equal to the curvature of a rotatable drumEASTMAN KODAK CO·Filed 1991·Granted Jun 8, 1993·4 cites·9 claims
- 4541US5025163ARadiographic imaging screenEASTMAN KODAK CO·Filed 1989·Granted Jun 18, 1991·6 cites·8 claims
- 4640US5700594AMagnetic medium capable of supporting both longitudinal and perpendicular recording, and method of making sameEASTMAN KODAK CO·Filed 1995·Granted Dec 23, 1997·4 cites·3 claims
- 4738US6549368B1Segmented plate hub hold down system for recording mediumIOMEGA CORP·Filed 1999·Granted Apr 15, 2003·3 cites·8 claims
- 4838US5691682AVery high field micro magnetic roller and method of making sameEASTMAN KODAK CO·Filed 1995·Granted Nov 25, 1997·6 cites·17 claims
- 4937US4642718AOptimum control of overwrite by record gap length selectionEASTMAN KODAK CO·Filed 1984·Granted Feb 10, 1987·2 cites·8 claims
- 5037US2006145691A1Ferromagnetic detection pillar and variable aperture portalMEDNOVUS INC·Filed 2005·Application pending·0 cites
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