Granted Patent
Utility
US 5,791,028 · App. 08/922,413
Reciprocating hydroenhancement system
Inventor:
Paul F. Zolin
Patented Case
View Patent ↗
Granted: Aug 11, 1998
Filed: Sep 3, 1997
Inventor
Paul F. Zolin
Assignee (at issue)
Valmet Aktiebolag
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.