Granted Patent
Utility
US 4,525,604 · App. 06/502,011
Horn loudspeaker with convex diaphragm
Inventor:
Kent H. Frye
Patented Case
View Patent ↗
Granted: Jun 25, 1985
Filed: Jun 7, 1983
Inventor
Kent H. Frye
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.