Granted Patent
Utility
US 6,158,973 · App. 09/536,227
Multi-stage manual hydraulic pump
Inventor:
John L. Maliszewski
Patented Case
View Patent ↗
Granted: Dec 12, 2000
Filed: Mar 27, 2000
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.