Granted Patent
Utility
US 4,239,463 · App. 05/946,557
Reciprocating plunger pump with improved liquid end valve assembly
Inventor:
Charles Yaindl
Patented Case
View Patent ↗
Granted: Dec 16, 1980
Filed: Sep 28, 1978
Inventor
Charles Yaindl
Assignee (at issue)
Worthington Pump, 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.