Granted Patent
Utility
US 6,320,828 · App. 09/347,373
Servo system having track crossing detection for an optical disk drive system
Inventor:
Kai Sun
Patented Case
View Patent ↗
Granted: Nov 20, 2001
Filed: Jul 6, 1999
Inventor
Kai Sun
Assignee (at issue)
Oak Technology, Inc.
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.