Inventor · disambiguated record
Motohisa Hirao
Also filed as: HIRAO MOTOHISA
9 granted patents·227 citations·filing 1979–1992
90Inventor score
Files withHITACHI LTD9
Top patents by PatentIndex Score
9 records- 0184US4426700ASemiconductor laser deviceHITACHI LTD·Filed 1981·Granted Jan 17, 1984·30 cites·6 claims
- 0283US5340637AOptical device diffraction gratings and a photomask for use in the sameHITACHI LTD·Filed 1992·Granted Aug 23, 1994·67 cites·11 claims
- 0382US4665528ADistributed-feedback semiconductor laser deviceHITACHI LTD·Filed 1984·Granted May 12, 1987·25 cites·9 claims
- 0482US4366569ASemiconductor laser device including an arrangement for preventing laser degradation caused by excessive current flowHITACHI LTD·Filed 1980·Granted Dec 28, 1982·26 cites·5 claims
- 0580US4775980ADistributed-feedback semiconductor laser deviceHITACHI LTD·Filed 1985·Granted Oct 4, 1988·28 cites·11 claims
- 0670US4361887ASemiconductor light emitting elementHITACHI LTD·Filed 1980·Granted Nov 30, 1982·18 cites·9 claims
- 0769US4288757ASemiconductor laser deviceHITACHI LTD·Filed 1979·Granted Sep 8, 1981·17 cites·6 claims
- 0855US4905057ASemiconductor devicesHITACHI LTD·Filed 1989·Granted Feb 27, 1990·10 cites·26 claims
- 0942US4841536ASemiconductor laser devicesHITACHI LTD·Filed 1986·Granted Jun 20, 1989·6 cites·6 claims
Join the waitlist — get patent alerts
Get an alert when Motohisa Hirao 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 →