Granted Patent
Utility
US 4,453,559 · App. 06/312,930
Pneumatic controller
Inventors:
Gerald F. Varnum, David E. Wiklund
Patented Case
View Patent ↗
Granted: Jun 12, 1984
Filed: Oct 19, 1981
Inventors
Gerald F. Varnum
David E. Wiklund
Assignee (at issue)
Fisher Controls 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.