Granted Patent
Utility
US 4,917,150 · App. 07/225,925
Solenoid operated pressure control valve
Inventors:
Robert O. Koch, Warren H. Cowles, Keith D. Marsh
Patented Case
View Patent ↗
Granted: Apr 17, 1990
Filed: Jul 29, 1988
Inventors
Robert O. Koch
Warren H. Cowles
Keith D. Marsh
Assignee (at issue)
Colt 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.