Granted Patent
Utility
US 4,844,401 · App. 07/212,845
Noise isolated relay
Inventor:
David M. Tenniswood
Patented Case
View Patent ↗
Granted: Jul 4, 1989
Filed: Jun 29, 1988
Inventor
David M. Tenniswood
Assignee (at issue)
Hi-Ram, 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.