Granted Patent
Utility
US 4,550,749 · App. 06/588,289
Adjustable check valve
Inventor:
Donald James Krikorian
Patented Case
View Patent ↗
Granted: Nov 5, 1985
Filed: Mar 12, 1984
Inventor
Donald James Krikorian
Assignee (at issue)
C. R. Bard, 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.