Granted Patent
Utility
US 4,242,673 · App. 05/885,369
Optical particle detector
Inventor:
Glenn F. Cooper
Patented Case
View Patent ↗
Granted: Dec 30, 1980
Filed: Mar 13, 1978
Inventor
Glenn F. Cooper
Assignee (at issue)
American District Telegraph Company
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.