Granted Patent
Utility
US 4,934,652 · App. 07/449,707
Dual stage valve actuator
Inventor:
Thomas Golden
Patented Case
View Patent ↗
Granted: Jun 19, 1990
Filed: Dec 11, 1989
Inventor
Thomas Golden
Assignee (at issue)
Otis Engineering Corporation
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.