Granted Patent
Utility
US 4,921,409 · App. 07/209,698
High pressure reciprocating pump
Inventor:
Dragan Besic
Patented Case
View Patent ↗
Granted: May 1, 1990
Filed: Jun 21, 1988
Inventor
Dragan Besic
Assignee (at issue)
Dresser 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.