Granted Patent
Utility
US 4,408,248 · App. 06/335,623
Protection circuit
Inventors:
Raymond M. Bulley, William F. MacPherson, Robert F. Youhas
Patented Case
View Patent ↗
Granted: Oct 4, 1983
Filed: Dec 30, 1981
Inventors
Raymond M. Bulley
William F. MacPherson
Robert F. Youhas
Assignee (at issue)
Bell Telephone Laboratories, Inc.
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.