Granted Patent
Utility
US 4,252,145 · App. 06/020,604
Manually reset control valve for a fluid actuator
Inventor:
Clifford M. Peters
Patented Case
View Patent ↗
Granted: Feb 24, 1981
Filed: Mar 15, 1979
Inventor
Clifford M. Peters
Assignee (at issue)
W-K-M Wellhead 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.