Inventor · disambiguated record
Nobuo Imada
Also filed as: IMADA NOBUO
5 granted patents·72 citations·filing 1993–2000
81Inventor score
Technology areasG11B
Files withHITACHI LTD5
Top patents by PatentIndex Score
5 records- 0175US5404344ARecording/reproducing optical head producing focusing error signal from zero-th order diffracted light and tracking error signal from first order diffracted lightHITACHI LTD·Filed 1993·Granted Apr 4, 1995·23 cites·12 claims
- 0269US5699341AOptical disk apparatus and optical head thereofHITACHI LTD·Filed 1996·Granted Dec 16, 1997·19 cites·22 claims
- 0367US5872761AOptical disk apparatus and optical head thereofHITACHI LTD·Filed 1997·Granted Feb 16, 1999·17 cites·25 claims
- 0463US6388976B1Compact optical head including two light emitters having parallel optical axesHITACHI LTD·Filed 2000·Granted May 14, 2002·4 cites·23 claims
- 0552US6069862ACompact optical head including two light emitters having parallel optical axesHITACHI LTD·Filed 1997·Granted May 30, 2000·9 cites·15 claims
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →