Granted Patent
Utility
US 4,387,611 · App. 06/265,234
Hydraulic wrench for simultaneously tightening or loosening at least two threaded connectors
Inventor:
John K. Junkers
Patented Case
View Patent ↗
Granted: Jun 14, 1983
Filed: May 19, 1981
Inventor
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.