Granted Patent
Utility
US 4,387,788 · App. 06/341,442
Diaphragm pressure ring for tone generators
Inventors:
Michael Slavin, Irvin B. Rea
Patented Case
View Patent ↗
Granted: Jun 14, 1983
Filed: Jan 21, 1982
Inventors
Michael Slavin
Irvin B. Rea
Assignee (at issue)
Lectron Products, 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.