Granted Patent
Utility
US 4,601,235 · App. 06/621,832
Reciprocating pump piston
Inventor:
Emmett T. Roberts
Patented Case
View Patent ↗
Granted: Jul 22, 1986
Filed: Jun 18, 1984
Inventor
Emmett T. Roberts
Assignee (at issue)
TRW Limited
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.