Granted Patent
Utility
US 4,291,787 · App. 06/012,874
Exercising device with double acting hydraulic cylinder
Inventor:
Jerry D. Brentham
Patented Case
View Patent ↗
Granted: Sep 29, 1981
Filed: Feb 16, 1979
Inventor
Jerry D. Brentham
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.