Granted Patent
Utility
US 4,687,322 · App. 06/931,013
Projection optical apparatus
Inventors:
Akikazu Tanimoto, Shoji Ishizaka, Yutaka Endo, Hiroyuki Suzuki, Masamitsu Yanagihara
Patented Case
View Patent ↗
Granted: Aug 18, 1987
Filed: Nov 17, 1986
Inventors
Akikazu Tanimoto
Shoji Ishizaka
Yutaka Endo
Hiroyuki Suzuki
Masamitsu Yanagihara
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.