Granted Patent
Utility
US 4,260,928 · App. 05/959,106
Electro-acoustic transducer with horn and reflector
Inventor:
Robert J. Salem
Patented Case
View Patent ↗
Granted: Apr 7, 1981
Filed: Nov 9, 1978
Inventor
Robert J. Salem
Assignee (at issue)
General Electric 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.