Inventor · disambiguated record
Etsufumi Yamamoto
Also filed as: YAMAMOTO ETSUFUMI
8 granted patents·93 citations·filing 1988–1997
87Inventor score
Files withSONY CORP8
Top patents by PatentIndex Score
8 records- 0175US5181195ATracking error signal generator with dc offset cancellationSONY CORP·Filed 1991·Granted Jan 19, 1993·24 cites·4 claims
- 0265US4893296AOptical pickup deviceSONY CORP·Filed 1988·Granted Jan 9, 1990·15 cites·14 claims
- 0364US5181193AOptical pickup device for a recording and/or reproducing apparatusSONY CORP·Filed 1989·Granted Jan 19, 1993·13 cites·7 claims
- 0461US6134198AOptical disc apparatus and tracking error signal calculation circuitSONY CORP·Filed 1997·Granted Oct 17, 2000·16 cites·19 claims
- 0556US4897828AOptical pickup deviceSONY CORP·Filed 1988·Granted Jan 30, 1990·10 cites·14 claims
- 0652US5144614AOptical pickup deviceSONY CORP·Filed 1992·Granted Sep 1, 1992·9 cites·4 claims
- 0740US6130868AApparatus and method for controlling rotational speed during a pause operationSONY CORP·Filed 1997·Granted Oct 10, 2000·5 cites·24 claims
- 0830US5606537AMethod of adjusting optics of optical pickup using error negating signal processing techniqueSONY CORP·Filed 1995·Granted Feb 25, 1997·1 cites·2 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →