Granted Patent
Utility
US 5,696,748 · App. 08/681,810
Hologram optical system for optical pickup for optical disk drive
Inventor:
Hiroyasu Yoshikawa
Patented Case
View Patent ↗
Granted: Dec 9, 1997
Filed: Jul 29, 1996
Inventor
Hiroyasu Yoshikawa
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.