Granted Patent
Utility
US 4,351,064 · App. 05/328,213
Communication
Inventor:
Walter Ewanus
Patented Case
View Patent ↗
Granted: Sep 21, 1982
Filed: Jan 31, 1973
Inventor
Walter Ewanus
Assignee (at issue)
Westinghouse Electric Company LLC
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.