Granted Patent
Utility
US 4,686,112 · App. 06/457,578
Deposition of silicon dioxide
Inventor:
Dorothy M. Hoffman
Patented Case
View Patent ↗
Granted: Aug 11, 1987
Filed: Jan 13, 1983
Inventor
Dorothy M. Hoffman
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.