Granted Patent
Utility
US 6,079,956 · App. 09/048,964
Multi-stage hydraulic pump
Inventor:
John L. Maliszewski
Patented Case
View Patent ↗
Granted: Jun 27, 2000
Filed: Mar 26, 1998
Inventor
John L. Maliszewski
Assignee (at issue)
Trench Plate Rental Co.
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.