Inventor · disambiguated record
Sadao Hishiyama
Also filed as: HISHIYAMA SADAO
16 granted patents·553 citations·filing 1973–2001
95Inventor score
Files withHITACHI LTD16
Top patents by PatentIndex Score
16 records- 0195US4833020AMagnetic recording mediumHITACHI LTD·Filed 1988·Granted May 23, 1989·77 cites·30 claims
- 0294US5605733AMagnetic recording medium, method for its production, and system for its useHITACHI LTD·Filed 1993·Granted Feb 25, 1997·70 cites·28 claims
- 0393US5236791AMagnetic recording medium and magnetic storageHITACHI LTD·Filed 1989·Granted Aug 17, 1993·58 cites·44 claims
- 0493US5147732ALongitudinal magnetic recording media and magnetic memory unitsHITACHI LTD·Filed 1989·Granted Sep 15, 1992·96 cites·34 claims
- 0591US5143794AMagnetic recording media for longitudinal recording, process for producing the same and magnetic memory apparatusHITACHI LTD·Filed 1989·Granted Sep 1, 1992·49 cites·8 claims
- 0682US6627253B2Magnetic recording media for longitudinal recording, process for producing the same and magnetic memory apparatusHITACHI LTD·Filed 2001·Granted Sep 30, 2003·16 cites·6 claims
- 0777US5665478AMagnetic recording media for longitudinal recordingHITACHI LTD·Filed 1994·Granted Sep 9, 1997·32 cites·44 claims
- 0876US4883711AMagnetic recording mediumHITACHI LTD·Filed 1987·Granted Nov 28, 1989·30 cites·9 claims
- 0976US3947372AFerrimagnetic materialHITACHI LTD·Filed 1973·Granted Mar 30, 1976·25 cites·8 claims
- 1074US4621030APerpendicular magnetic recording medium and manufacturing method thereofHITACHI LTD·Filed 1983·Granted Nov 4, 1986·24 cites·33 claims
- 1170US6335103B1Magnetic recording media for longitudinal recordingHITACHI LTD·Filed 1997·Granted Jan 1, 2002·21 cites·26 claims
- 1261US4842917AMagnetic recording medium and process for producing the sameHITACHI LTD·Filed 1987·Granted Jun 27, 1989·20 cites·30 claims
- 1356US4792497AMagnetic recording media for longitudinal recordingHITACHI LTD·Filed 1988·Granted Dec 20, 1988·10 cites·8 claims
- 1454US4786553AMagnetic recording mediumHITACHI LTD·Filed 1987·Granted Nov 22, 1988·13 cites·26 claims
- 1542US4544591APerpendicular magnetic recording mediumHITACHI LTD·Filed 1983·Granted Oct 1, 1985·7 cites·25 claims
- 1637US4939045AMagnetic recording mediumHITACHI LTD·Filed 1988·Granted Jul 3, 1990·5 cites·22 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →