Granted Patent
Utility
US 6,357,335 · App. 09/471,921
Pneumatic volume booster for valve positioner
Inventors:
Lawrence R. Lafler, Douglas J. Tanner
Patented Case
View Patent ↗
Granted: Mar 19, 2002
Filed: Dec 23, 1999
Inventors
Lawrence R. Lafler
Douglas J. Tanner
Assignee (at issue)
SOX, 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.