Granted Patent
Utility
US 5,249,213 · App. 07/791,993
Circuit for counting the number of crossed over tracks by an optical head in optical disk apparatus
Inventor:
Hideki Kobunaya
Patented Case
View Patent ↗
Granted: Sep 28, 1993
Filed: Nov 14, 1991
Inventor
Hideki Kobunaya
Assignee (at issue)
NEC CORPORATION
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.