Granted Patent
Utility
US 4,307,889 · App. 06/115,436
Apparatus utilizing rotary motion of a member as the motive force for a pump
Inventor:
Andre L. Piazza
Patented Case
View Patent ↗
Granted: Dec 29, 1981
Filed: Jan 25, 1980
Inventor
Andre L. Piazza
Assignee (at issue)
NL 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.