Granted Patent
Utility
US 4,355,903 · App. 06/181,990
Thin film thickness monitor
Inventor:
John R. Sandercock
Patented Case
View Patent ↗
Granted: Oct 26, 1982
Filed: Aug 28, 1980
Inventor
John R. Sandercock
Assignee (at issue)
RCA 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.