Granted Patent
Utility
US 4,304,982 · App. 06/154,043
Optical viewing system associated apparatus and machines equipped therewith
Inventor:
James R. Gramse
Patented Case
View Patent ↗
Granted: Dec 8, 1981
Filed: May 28, 1980
Inventor
James R. Gramse
Assignee (at issue)
Chemtronics Co., Ltd.
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.