Granted Patent
Utility
US 5,960,811 · App. 09/145,664
Sensing valve for automatic shutoff when a substance is present in a flow of fluid
Inventor:
Jeffrey Partridge
Patented Case
View Patent ↗
Granted: Oct 5, 1999
Filed: Sep 2, 1998
Inventor
Jeffrey Partridge
Assignee (at issue)
OIL STATES INDUSTRIES, 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.