Granted Patent
Utility
US 4,322,277 · App. 06/207,713
Step mask for substrate sputtering
Inventor:
Stephen T. Opresko
Patented Case
View Patent ↗
Granted: Mar 30, 1982
Filed: Nov 17, 1980
Inventor
Stephen T. Opresko
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.