Granted Patent
Utility
US 6,741,402 · App. 09/973,114
Objective lens for optical head
Inventors:
Shuichi Takeuchi, Koichi Maruyama
Patented Case
View Patent ↗
Granted: May 25, 2004
Filed: Oct 10, 2001
Inventors
Shuichi Takeuchi
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.