Granted Patent
Utility
US 4,410,770 · App. 06/271,621
Directional microphone
Inventor:
Lee Hagey
Patented Case
View Patent ↗
Granted: Oct 18, 1983
Filed: Jun 8, 1981
Inventor
Lee Hagey
Assignee (at issue)
Electro-Voice, Inc.
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.