Granted Patent
Utility
US 6,594,222 · App. 09/747,969
Objective lens for optical pick-up
Inventor:
Koichi Maruyama
Patented Case
View Patent ↗
Granted: Jul 15, 2003
Filed: Dec 27, 2000
Inventor
Koichi Maruyama
Assignee (at issue)
Pentax 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.