Granted Patent
Utility
US 4,899,700 · App. 07/153,155
Pneumatically powered valve actuator
Inventors:
William E. Richeson Jr., Federick L. Erickson
Patented Case
View Patent ↗
Granted: Feb 13, 1990
Filed: Feb 8, 1988
Inventors
William E. Richeson Jr.
Federick L. Erickson
Assignee (at issue)
Magnavox Government and Electronic 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.