Granted Patent
Utility
US 4,252,996 · App. 06/091,135
Convertible acoustic telephone coupler
Inventor:
Bernardino R. D'Agostino
Patented Case
View Patent ↗
Granted: Feb 24, 1981
Filed: Nov 5, 1979
Inventor
Bernardino R. D'Agostino
Assignee (at issue)
Hi-G Incorporated
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.