Granted Patent
Utility
US 6,791,932 · App. 09/556,416
Optical system of optical pick-up
Inventor:
Koichi Maruyama
Patented Case
View Patent ↗
Granted: Sep 14, 2004
Filed: Apr 24, 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.