Granted Patent
Utility
US 4,187,926 · App. 05/967,739
Loudspeaker horn
Inventors:
Clifford A. Henricksen, Mark Ureda
Patented Case
View Patent ↗
Granted: Feb 12, 1980
Filed: Dec 8, 1978
Inventors
Clifford A. Henricksen
Mark Ureda
Assignee (at issue)
Altec, 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.