Granted Patent
Utility
US 4,238,745 · App. 06/049,583
Phase shifter
Inventor:
Alfred Schwarzmann
Patented Case
View Patent ↗
Granted: Dec 9, 1980
Filed: Jun 18, 1979
Inventor
Alfred Schwarzmann
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.