Granted Patent
Utility
US 4,298,017 · App. 06/118,237
Automatic fluid component shut off system
Inventor:
Robert D. Hetherington
Patented Case
View Patent ↗
Granted: Nov 3, 1981
Filed: Feb 4, 1980
Inventor
Robert D. Hetherington
Assignee (at issue)
Poly-Glas 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.