Granted Patent
Utility
US 4,142,973 · App. 05/769,647
Valve with indicator circuit
Inventor:
Robert D. Kachman
Patented Case
View Patent ↗
Granted: Mar 6, 1979
Filed: Feb 17, 1977
Inventor
Robert D. Kachman
Assignee (at issue)
Facet Enterprises, Incorporated
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.