Granted Patent
Utility
US 4,784,371 · App. 07/074,089
Hydraulic jack having a small diameter bleed part in the cylinder wall
Inventor:
William Kamper
Patented Case
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Granted: Nov 15, 1988
Filed: Jul 16, 1987
Inventor
William Kamper
Assignee (at issue)
Hein-Werner 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.