Granted Patent
Utility
US 4,581,496 · App. 06/072,403
Diaphragm for attenuating harmonic response in an electroacoustic transducer
Inventor:
Louis P. Sweany
Patented Case
View Patent ↗
Granted: Apr 8, 1986
Filed: Sep 4, 1979
Inventor
Louis P. Sweany
Assignee (at issue)
Emhart Industries, 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.