Granted Patent
Utility
US 4,733,749 · App. 06/834,403
High output loudspeaker for low frequency reproduction
Inventors:
Raymond J. Newman, David E. Carlson
Patented Case
View Patent ↗
Granted: Mar 29, 1988
Filed: Feb 26, 1986
Inventors
Raymond J. Newman
David E. Carlson
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.