Granted Patent
Utility
US 4,852,528 · App. 07/209,279
Pneumatic actuator with permanent magnet control valve latching
Inventors:
William E. Richeson, Frederick L. Erickson
Patented Case
View Patent ↗
Granted: Aug 1, 1989
Filed: Jun 20, 1988
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.