Granted Patent
Utility
US 6,819,504 · App. 10/235,643
High NA objective lens for optical pick-up
Inventor:
Koichi Maruyama
Patented Case
View Patent ↗
Granted: Nov 16, 2004
Filed: Sep 6, 2002
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.