Inventor
OHSAWA SEIICHI
JP21 patents
⚠️ This page may combine multiple inventors who share the name “OHSAWA SEIICHI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
PIONEER ELECTRONIC CORP
9 patentsUS5608715AMar 4, 1997
Multi-layered recording disk and recording/reproducing system using the same
PIONEER ELECTRONIC CORP273 citations99
US5258968ANov 2, 1993
Tracking error signal generating device for preventing offset of the generated tracking error signal
PIONEER ELECTRONIC CORP70 citations96
US5615206AMar 25, 1997
Optical disk
PIONEER ELECTRONIC CORP8 citations74
US5546372AAug 13, 1996
Information detection light intensity control apparatus in optical disc recorded-information reproducing apparatus
PIONEER ELECTRONIC CORP9 citations73
US5381391AJan 10, 1995
Optical recording medium having a third non-linear optical reflection film
PIONEER ELECTRONIC CORP14 citations73
US5365052ANov 15, 1994
Optical information reading apparatus with controlled numerical aperture relationship between focusing and receiving optical systems
PIONEER ELECTRONIC CORP9 citations73
US4919511AApr 24, 1990
Fibre-type light conversion device
PIONEER ELECTRONIC CORP7 citations73
US4874221AOct 17, 1989
Fibre-type light wavelength conversion device
PIONEER ELECTRONIC CORP13 citations73
US5455817AOct 3, 1995
Second harmonics generating optical recording layer
PIONEER ELECTRONIC CORP0 citations52
PIONEER CORP
6 patentsUSRE40556EOct 28, 2008
Multi-layer information recording medium and information recording and reproducing apparatus
PIONEER CORP12 citations92
USRE39463EJan 9, 2007
Multi-layer information recording medium and information recording and reproducing apparatus
PIONEER CORP13 citations92
USRE39322EOct 3, 2006
Multi-layer information recording medium and information recording and reproducing apparatus
PIONEER CORP13 citations92
US6418104B1Jul 9, 2002
Tilt detector
PIONEER CORP22 citations92
US6773781B2Aug 10, 2004
Multi-layer information recording medium and information recording and reproducing apparatus
PIONEER CORP5 citations74
US7190664B2Mar 13, 2007
High density optical recording medium and method for reproducing thereof
PIONEER CORP1 citations52
CITIZEN WATCH CO LTD
5 patentsUS4774882AOct 4, 1988
Method for controlling printing impact power in impact type dot printer
CITIZEN WATCH CO LTD9 citations74
US4650348AMar 17, 1987
Method of dot-printing underlines
CITIZEN WATCH CO LTD4 citations62
US4527921AJul 9, 1985
Paper feed apparatus for shuttle printer
CITIZEN WATCH CO LTD3 citations62
US4852480AAug 1, 1989
Dot line printer with individually replaceable printing head
CITIZEN WATCH CO LTD3 citations61
US4757760AJul 19, 1988
Wire mask for a dot printer head apparatus
CITIZEN WATCH CO LTD5 citations57