Inventor
ITOH MASAKI
JP23 patents
⚠️ This page may combine multiple inventors who share the name “ITOH MASAKI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
NEC CORP
13 patentsUS5654950AAug 5, 1997
Method for protecting data recorded on a partial read-only memory (ROM) medium from unauthorized copying
NEC CORP32 citations92
US4839208AJun 13, 1989
Optical information recording medium
NEC CORP28 citations92
US6606293B1Aug 12, 2003
Optical information recording medium and methods for recording, reading, and erasing information thereupon
NEC CORP9 citations73
US4740447AApr 26, 1988
Optical recording medium
NEC CORP12 citations73
US4763139AAug 9, 1988
Optical information storage medium
NEC CORP17 citations72
US4504548AMar 12, 1985
Optical information recording medium for semiconductor laser
NEC CORP14 citations71
US5398219AMar 14, 1995
Magneto-optical recording medium with amorphous alloy film layers
NEC CORP8 citations69
US5790499AAug 4, 1998
Method for protecting data recorded on a partial read-only memory (ROM) medium from unauthorized copying
NEC CORP4 citations62
US5292592AMar 8, 1994
Optical information recording medium in which a protective layer comprises a Ni-Cr alloy layer
NEC CORP3 citations62
US4775568AOct 4, 1988
Optical information storage medium
NEC CORP4 citations62
US5473583ADec 5, 1995
Magneto-optical recording medium, recording and playback method and apparatus for the same
NEC CORP3 citations58
US6117511ASep 12, 2000
Optical recording media
NEC CORP2 citations56
US5362537ANov 8, 1994
Optical information recording medium comprising two magneto-optical layers which are made of GDFECO and TBFETI, respectively
NEC CORP1 citations52