Inventor · disambiguated record
Masamichi Utsumi
Also filed as: UTSUMI MASAMICHI
5 granted patents·91 citations·filing 1996–2001
82Inventor score
Technology areasG11B
Files withSONY CORP5
Top patents by PatentIndex Score
5 records- 0177US6366543B2Optical pickup for discriminating between and reading different types of optical discsSONY CORP·Filed 2001·Granted Apr 2, 2002·11 cites·6 claims
- 0272US6222803B1Optical pickup for discriminating between and reading different types of optical discsSONY CORP·Filed 1996·Granted Apr 24, 2001·22 cites·24 claims
- 0371US5682372AMethod and apparatus for playing back multilayer diskSONY CORP·Filed 1996·Granted Oct 28, 1997·29 cites·13 claims
- 0470US5742575AMethod and device for identifying discSONY CORP·Filed 1996·Granted Apr 21, 1998·23 cites·6 claims
- 0542US5751679AHologram formed on an objective lens for one defracting light beams which are separated by more than one track widthSONY CORP·Filed 1996·Granted May 12, 1998·6 cites·10 claims
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