Granted Patent
Utility
US 4,668,077 · App. 06/749,438
Projection optical apparatus
Inventor:
Hiroshi Tanaka
Patented Case
View Patent ↗
Granted: May 26, 1987
Filed: Jun 27, 1985
Inventor
Hiroshi Tanaka
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.