Granted Patent
Utility
US 4,837,657 · App. 07/134,481
Electrostatic discharge device
Inventors:
Thomas D. Belanger, Jr., Roy L. Johnson
Patented Case
View Patent ↗
Granted: Jun 6, 1989
Filed: Dec 17, 1987
Inventors
Thomas D. Belanger, Jr.
Roy L. Johnson
Assignee (at issue)
Communications Systems, 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.