Granted Patent
Utility
US 6,000,675 · App. 08/845,312
Tension-spring return rotary valve actuator
Inventor:
Philip W. Eggleston
Patented Case
View Patent ↗
Granted: Dec 14, 1999
Filed: Apr 25, 1997
Inventor
Philip W. Eggleston
Assignee (at issue)
Fisher Controls International LLC
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.