Granted Patent
Utility
US 4,345,968 · App. 06/296,754
End point detection using gas flow
Inventor:
Mary Ellen B. Coe
Patented Case
View Patent ↗
Granted: Aug 24, 1982
Filed: Aug 27, 1981
Inventor
Mary Ellen B. Coe
Assignee (at issue)
NCR Corporation
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.