Granted Patent
Utility
US 5,150,347 · App. 07/488,147
Beam track position control apparatus for optical disk apparatus
Inventor:
Shigenori Yanagi
Patented Case
View Patent ↗
Granted: Sep 22, 1992
Filed: Mar 5, 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.