Granted Patent
Utility
US 6,541,748 · App. 09/500,581
Optical disk checkup/measuring apparatus
Inventor:
Takayuki Asahina
Patented Case
View Patent ↗
Granted: Apr 1, 2003
Filed: Feb 10, 2000
Inventor
Takayuki Asahina
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.