Granted Patent
Utility
US 5,131,695 · App. 07/668,972
Coupling with teflon seat
Inventor:
Herman D. Wiser
Patented Case
View Patent ↗
Granted: Jul 21, 1992
Filed: Mar 13, 1991
Inventor
Herman D. Wiser
Assignee (at issue)
Chatleff Controls, 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.