Granted Patent
Utility
US 4,875,775 · App. 06/642,144
Reciprocally switched four modulator system
Inventors:
Ronald J. Michal, Eric Udd, Richard F. Cahill
Patented Case
View Patent ↗
Granted: Oct 24, 1989
Filed: Aug 20, 1984
Inventors
Ronald J. Michal
Eric Udd
Richard F. Cahill
Assignee (at issue)
McDonnell Douglas 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.