IP Library › Granted Patent US 5,482,448
Granted Patent Utility
US 5,482,448 · App. 08/258,092

Positive displacement pump with concentrically arranged reciprocating-rotating pistons

Inventors: Richard G. Atwater, Kenneth L. Shaw
Patented Case View Patent ↗
Granted: Jan 9, 1996 Filed: Jun 10, 1994
Inventors
Richard G. Atwater
Kenneth L. Shaw

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.

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Quick Facts
Patent No.
US 5,482,448
App. No.
08/258,092
Filed
1994-06-10
Granted
1996-01-09
Kind
A