Granted Patent
Utility
US 4,817,669 · App. 07/057,318
Control valve
Inventors:
Miller M. Barrier, Graeme E. Reynolds, Daniel J. Pesek
Patented Case
View Patent ↗
Granted: Apr 4, 1989
Filed: Jun 4, 1987
Inventors
Miller M. Barrier
Graeme E. Reynolds
Daniel J. Pesek
Assignee (at issue)
B.R. Controls, Inc.
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.