Granted Patent
Utility
US 6,807,139 · App. 10/117,188
Objective lens and optical pickup apparatus
Inventor:
Katsuya Sakamoto
Patented Case
View Patent ↗
Granted: Oct 19, 2004
Filed: Apr 8, 2002
Inventor
Katsuya Sakamoto
Assignee (at issue)
Konica 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.