Granted Patent
Utility
US 4,776,562 · App. 07/078,826
Dual piston pneumatically operated valve
Inventors:
William S. Kalaskie, David E. Hughes
Patented Case
View Patent ↗
Granted: Oct 11, 1988
Filed: Jul 28, 1987
Inventors
William S. Kalaskie
David E. Hughes
Assignee (at issue)
Stanley G. Flagg & Co.
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.