Granted Patent
Utility
US 4,666,273 · App. 06/844,263
Automatic magnification correcting system in a projection optical apparatus
Inventors:
Hisayuki Shimizu, Satoru Anzai, Hiroshi Tanaka, Kyoichi Suwa
Patented Case
View Patent ↗
Granted: May 19, 1987
Filed: Mar 25, 1986
Inventors
Hisayuki Shimizu
Satoru Anzai
Hiroshi Tanaka
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.