Granted Patent
Utility
US 5,690,458 · App. 08/642,623
Hydraulic bolt tensioner
Inventor:
John K. Junkers
Patented Case
View Patent ↗
Granted: Nov 25, 1997
Filed: May 3, 1996
Inventor
John K. Junkers
Assignee (at issue)
John K. Junkers
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.