Granted Patent
Utility
US 5,777,965 · App. 08/683,174
Optical disk having an erased-state indicator and optical disk apparatus for reducing frequency of disk-erasing operations
Inventors:
Satoshi Itami, Masaru Nakahara, Masahiro Nakada, Hiroshi Suzuki, Kenichi Utsumi
Patented Case
View Patent ↗
Granted: Jul 7, 1998
Filed: Jul 18, 1996
Inventors
Satoshi Itami
Masaru Nakahara
Masahiro Nakada
Hiroshi Suzuki
Kenichi Utsumi
Assignee (at issue)
Fujitsu Limited
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.