Granted Patent
Utility
US 4,650,983 · App. 06/667,890
Focusing apparatus for projection optical system
Inventor:
Kyoichi Suwa
Patented Case
View Patent ↗
Granted: Mar 17, 1987
Filed: Nov 2, 1984
Inventor
Kyoichi Suwa
Assignee (at issue)
Nippon Kogaku K.K.
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.