Granted Patent
Utility
US 5,646,415 · App. 08/516,874
Apparatus for detecting a defect of an optical disc based on sensor outputs for adjacent positions
Inventor:
Yoshitake Yanagisawa
Patented Case
View Patent ↗
Granted: Jul 8, 1997
Filed: Aug 18, 1995
Inventor
Yoshitake Yanagisawa
Assignee (at issue)
Sony Disc 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.