Granted Patent
Utility
US 4,698,132 · App. 06/913,325
Method of forming tapered contact openings
Inventor:
Timothy A. Dennis
Patented Case
View Patent ↗
Granted: Oct 6, 1987
Filed: Sep 30, 1986
Inventor
Timothy A. Dennis
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.