Granted Patent
Utility
US 4,303,908 · App. 06/155,958
Electronic sounder
Inventors:
Robert B. Enemark, Aaron A. Galvin, Stephen Marchetti
Patented Case
View Patent ↗
Granted: Dec 1, 1981
Filed: Jun 3, 1980
Inventors
Robert B. Enemark
Aaron A. Galvin
Stephen Marchetti
Assignee (at issue)
American District Telegraph Company
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.