Granted Patent
Utility
US 4,320,779 · App. 06/176,366
Push-type control valve for fluid actuator
Inventor:
Clifford M. Peters
Patented Case
View Patent ↗
Granted: Mar 23, 1982
Filed: Aug 8, 1980
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.