Inventor · disambiguated record
Hiroaki Koyanagi
Also filed as: KOYANAGI HIROAKI
15 granted patents·480 citations·filing 1985–2000
95Inventor score
Top patents by PatentIndex Score
15 records- 0196US5018072AOptically readable mail system with general and receiver specific informationHITACHI LTD·Filed 1990·Granted May 21, 1991·133 cites·31 claims
- 0291US4773060AOptical information recording deviceHITACHI LTD·Filed 1985·Granted Sep 20, 1988·44 cites·16 claims
- 0390US4978187AOptical element, optical disc and rotary encoder with the optical elementHITACHI LTD·Filed 1989·Granted Dec 18, 1990·41 cites·22 claims
- 0489US4937808AIntergrated optical head with flexible substrate portionHITACHI LTD·Filed 1988·Granted Jun 26, 1990·40 cites·6 claims
- 0584US5701221AMagnetoresistive thin-film magnetic head and method of fabrication thereofHITACHI LTD·Filed 1995·Granted Dec 23, 1997·41 cites·6 claims
- 0683US4811328AOptical recording and reproducing deviceHITACHI LTD·Filed 1985·Granted Mar 7, 1989·30 cites·16 claims
- 0782US5177717AOptical memory medium and its information recording and erasing method and apparatusHITACHI LTD·Filed 1991·Granted Jan 5, 1993·32 cites·40 claims
- 0877US4718053AOptical information apparatus and method of recording and erasing informationHITACHI LTD·Filed 1985·Granted Jan 5, 1988·23 cites·21 claims
- 0972US5471358AThin film magnetoresistive head which includes a domain suppressing layer and method for manufacturing the sameHITACHI LTD·Filed 1992·Granted Nov 28, 1995·20 cites·19 claims
- 1063US5894380ARecording/reproducing separation type magnetic headHITACHI LTD·Filed 1996·Granted Apr 13, 1999·17 cites·6 claims
- 1162US5897969AMethod of fabricating a magnetoresistive thin-film magnetic headHITACHI LTD·Filed 1997·Granted Apr 27, 1999·14 cites·6 claims
- 1262US4862440AOptical head with optical beam control using acoustic wave deviceHITACHI LTD·Filed 1987·Granted Aug 29, 1989·12 cites·11 claims
- 1357US5110792AMethod and apparatus of optical modulation using superconductive oxide materialHITACHI LTD·Filed 1989·Granted May 5, 1992·16 cites·34 claims
- 1455USRE37785ERecording/reproducing separation type magnetic headHITACHI LTD·Filed 2000·Granted Jul 9, 2002·3 cites·8 claims
- 1537US5721942APersonal information display system for serving large capacities of general information to user-designated stations at user-designated timesHITACHI MAXELL·Filed 1991·Granted Feb 24, 1998·14 cites·15 claims
Join the waitlist — get patent alerts
Get an alert when Hiroaki Koyanagi files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →