Granted Patent
Utility
US 4,619,435 · App. 06/707,925
Control valve apparatus for pneumatic tools
Inventor:
Paul A. Biek
Patented Case
View Patent ↗
Granted: Oct 28, 1986
Filed: Mar 4, 1985
Inventor
Paul A. Biek
Assignee (at issue)
Dresser Industries, 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.