Granted Patent
Utility
US 4,277,712 · App. 06/083,693
Acoustic electric transducer with slotted base
Inventor:
Amin M. Hanafy
Patented Case
View Patent ↗
Granted: Jul 7, 1981
Filed: Oct 11, 1979
Inventor
Amin M. Hanafy
Assignee (at issue)
Hewlett-Packard Company, L.P.
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.