Granted Patent
Utility
US 5,086,419 · App. 07/575,847
Optical disk apparatus for controlling second optical beam based on bias information
Inventor:
Shigenori Yanagi
Patented Case
View Patent ↗
Granted: Feb 4, 1992
Filed: Aug 31, 1990
Inventor
Shigenori Yanagi
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.