Granted Patent
Utility
US 5,046,925 · App. 07/638,714
Gas piston liquid flow controller
Inventor:
Robert E. Fletcher
Patented Case
View Patent ↗
Granted: Sep 10, 1991
Filed: Jan 8, 1991
Inventor
Robert E. Fletcher
Assignee (at issue)
Air Products and Chemicals, 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.