Inventor · disambiguated record
Nobuo Akahira
Also filed as: AKAHIRA NOBUO
68 granted patents·2 pending applications·2,167 citations·filing 1976–2006
99Inventor score
Files withMATSUSHITA ELECTRIC INDUSTRIAL CO LTD67HITACHI LTD1KIMURA KUNIO1MATSUSHITA ELECTRIC IND INC LT1
Top patents by PatentIndex Score
70 records- 0198US6456584B1Optical information recording medium comprising a first layer having a phase that is reversibly changeable and a second information layer having a phase that is reversibly changeableMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1999·Granted Sep 24, 2002·170 cites·20 claims
- 0297US5764619AOptical recording medium having two separate recording layersMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1996·Granted Jun 9, 1998·123 cites·24 claims
- 0397US5097464AOptical recording medium and optical recording/reproducing apparatusMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1990·Granted Mar 17, 1992·106 cites·17 claims
- 0496US5412626AMethod of recording optical information with selective correction in pulse waveform and a recording system thereforMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1993·Granted May 2, 1995·85 cites·17 claims
- 0596US5150351AOptical information recording apparatus for recording an input signal having variable width pulse duration and pulse spacing periodsMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1991·Granted Sep 22, 1992·96 cites·8 claims
- 0696US5109373AOptical information recording methodMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1990·Granted Apr 28, 1992·110 cites·33 claims
- 0795US5635267AOptical information recording medium of phase change type having variably grooved tracks depending on their radial locationsMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1994·Granted Jun 3, 1997·77 cites·32 claims
- 0895US5568461AOptical information recording and reproducing apparatusMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1995·Granted Oct 22, 1996·112 cites·15 claims
- 0994US5216657AMethod and apparatus for timing variable optical information recordingMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1992·Granted Jun 1, 1993·87 cites·9 claims
- 1093US6434095B1Optical information recording medium, manufacturing method therefor, manufacturing apparatus therefor, and optical information recording and reproducing apparatusMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2000·Granted Aug 13, 2002·25 cites·5 claims
- 1193US5745475AOptical information recording mediumMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1997·Granted Apr 28, 1998·82 cites·16 claims
- 1292US5811217AOptical information recording medium and optical information recording/reproducing methodMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1994·Granted Sep 22, 1998·60 cites·9 claims
- 1392US4278734AOptical information recording material and method of recording and reproducing information using same materialMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1979·Granted Jul 14, 1981·37 cites·13 claims
- 1491US6771587B2Optical information recording medium, with plural information layersMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2003·Granted Aug 3, 2004·22 cites·7 claims
- 1591US6487151B1Optical information recording and reproducing system with overwrite capability and recording medium for use therewithMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1995·Granted Nov 26, 2002·47 cites·24 claims
- 1691US5493561AOptical information recording medium and information recording and reproducing method thereofMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1993·Granted Feb 20, 1996·54 cites·18 claims
- 1790US6611491B2Optical recording medium having dual recording layersMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2002·Granted Aug 26, 2003·18 cites·4 claims
- 1890US6031814AOptical disk with stop-pulse generating means in a guide grooveMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1997·Granted Feb 29, 2000·42 cites·2 claims
- 1988US6707776B2Recording and reproducing method of optical information recording mediumMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2002·Granted Mar 16, 2004·16 cites·11 claims
- 2087US4091171AOptical information storage material and method of making itMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1976·Granted May 23, 1978·20 cites·11 claims
- 2186US5272667AOptical information recording apparatus for recording optical information in a phase change type optical recording medium and method thereforMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1990·Granted Dec 21, 1993·40 cites·24 claims
- 2285US5348783AOptical information recording mediumMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1993·Granted Sep 20, 1994·31 cites·15 claims
- 2385US5305297AMethod for determining optimum irradiation conditions in optical data recordingMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1991·Granted Apr 19, 1994·37 cites·9 claims
- 2484US7116631B2Optical information recording medium manfacturing method therefor, manufacturing apparatus therefor, and optical information recording and reproducing apparatusMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2006·Granted Oct 3, 2006·3 cites·7 claims
- 2584US5289453AOptical information recording methodMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1992·Granted Feb 22, 1994·35 cites·15 claims
- 2683US5898394ACode conversion method and apparatus, code recording medium, code recording apparatus and code reproducing apparatusMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1997·Granted Apr 27, 1999·41 cites·36 claims
- 2783US5491003AMethod for manufacturing an optical recording film composed of a metal and an oxide which can undergo an oxidation-reduction reaction upon exposure to a laser beamMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1993·Granted Feb 13, 1996·28 cites·8 claims
- 2881US7136349B2Multi-layer optical information recording medium with pits or groovesMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2004·Granted Nov 14, 2006·8 cites·5 claims
- 2981US5545454AOptical information recording medium and method of designing its structureMATSUSHITA ELECTRIC IND INC LT·Filed 1995·Granted Aug 13, 1996·39 cites·2 claims
- 3081US5410534AOptical information recording mediumMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1993·Granted Apr 25, 1995·33 cites·10 claims
- 3181US5154957AOptical information recording mediumMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1991·Granted Oct 13, 1992·40 cites·19 claims
- 3280US6226239B1Optical information recording and reproducing apparatus for multiple layer recording mediumMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1999·Granted May 1, 2001·19 cites·3 claims
- 3380US5249175AOptical information recording medium and information recording and reproducing method thereforMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1992·Granted Sep 28, 1993·30 cites·22 claims
- 3479US5424106AOptical information recording medium and method of designing its structureMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1993·Granted Jun 13, 1995·24 cites·19 claims
- 3577US5459018AOptical information recording medium, a manufacturing method thereof and an optical information recording and reproducing method using the mediumMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1993·Granted Oct 17, 1995·21 cites·2 claims
- 3677US4385303AOptical recording and reproducing discMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1981·Granted May 24, 1983·19 cites·7 claims
- 3777US4322839AMethod and apparatus for recording and reproducing information on and from an optical diskMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1979·Granted Mar 30, 1982·18 cites·15 claims
- 3874US5517485AOptical information recording medium having first and second tracks and apparatus for recording to and reproducing from the mediumMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1994·Granted May 14, 1996·21 cites·26 claims
- 3974US4624914AOptical information recording medium of Te, O and Pd and method for making sameKIMURA KUNIO·Filed 1985·Granted Nov 25, 1986·35 cites·11 claims
- 4073US5883720AMethod of measuring a film thickness of multilayer thin filmMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1997·Granted Mar 16, 1999·36 cites·31 claims
- 4172US6532209B2Optical information recording medium and optical information recording and reproducing apparatusMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2002·Granted Mar 11, 2003·5 cites·1 claims
- 4270US7075870B2Recording/reproducing apparatus for optical information recording medium and optical headMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 2004·Granted Jul 11, 2006·6 cites·1 claims
- 4370US6033535AOptical information recording disk and method for manufacturing the sameMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1995·Granted Mar 7, 2000·19 cites·15 claims
- 4470US4330883ASystem and method of optical information storage in a recording discMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1979·Granted May 18, 1982·14 cites·19 claims
- 4566US6411592B1Optical information recording medium having convex and concave portions for recording information and an additional portion for condition data, and recording and reproducing apparatus for using the mediumMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1996·Granted Jun 25, 2002·11 cites·10 claims
- 4666US5346740AOptical information recording mediumMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1991·Granted Sep 13, 1994·22 cites·15 claims
- 4766US4587209AOptical information recording member comprising Au, TeO2 and TeMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1985·Granted May 6, 1986·23 cites·9 claims
- 4863US5233599AOptical disk with a recording layer composed of tellurium, antimony, and germaniumMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1991·Granted Aug 3, 1993·13 cites·7 claims
- 4962US6027594AMethod of manufacturing optical information recording mediumMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1996·Granted Feb 22, 2000·12 cites·6 claims
- 5061US5729513AData storage apparatus for recording and reproducing information on a recording medium by rotating the recording medium at different angular velocitiesMATSUSHITA ELECTRIC INDUSTRIAL CO LTD·Filed 1995·Granted Mar 17, 1998·12 cites·11 claims
Showing the top 50 of 70 patent records by PatentIndex Score.
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