Granted Patent
Utility
US 4,605,262 · App. 06/648,200
Three way check valve
Inventor:
Roy E. Bartholomew
Patented Case
View Patent ↗
Granted: Aug 12, 1986
Filed: Sep 7, 1984
Inventor
Roy E. Bartholomew
Assignee (at issue)
ALLIED CONSULTING, 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.