Granted Patent
Utility
US 4,685,137 · App. 06/735,400
Microphone with non-symmetrical directivity pattern
Inventors:
Alan R. Watson, Michael A. Bryson
Patented Case
View Patent ↗
Granted: Aug 4, 1987
Filed: May 17, 1985
Inventors
Alan R. Watson
Michael A. Bryson
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.