Granted Patent
Utility
US 6,454,542 · App. 09/723,673
Hydraulic cylinder powered double acting duplex piston pump
Inventor:
Carl F. Back
Patented Case
View Patent ↗
Granted: Sep 24, 2002
Filed: Nov 28, 2000
Inventor
Carl F. Back
Assignee (at issue)
Laibe Corporation
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.