Granted Patent
Utility
US 4,875,441 · App. 07/294,728
Enhanced efficiency valve actuator
Inventors:
William E. Richeson, Frederick L. Erickson
Patented Case
View Patent ↗
Granted: Oct 24, 1989
Filed: Jan 6, 1989
Inventors
William E. Richeson
Frederick L. Erickson
Assignee (at issue)
Magnavox Government and Industrial Electronics Company
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.