Granted Patent
Utility
US 4,722,664 · App. 06/270,946
Lined corrosion resistant pump
Inventor:
Jack L. Wissman
Patented Case
View Patent ↗
Granted: Feb 2, 1988
Filed: Jun 5, 1981
Inventor
Jack L. Wissman
Assignee (at issue)
The Duriron Company, 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.