Granted Patent
Utility
US 4,512,657 · App. 06/533,598
Exposure control system
Inventor:
Keiichiro Sakato
Patented Case
View Patent ↗
Granted: Apr 23, 1985
Filed: Sep 19, 1983
Inventor
Keiichiro Sakato
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.