Granted Patent
Utility
US 4,246,810 · App. 06/089,112
Tool for pre-tensioning a fastener
Inventor:
Frank E. Keske
Patented Case
View Patent ↗
Granted: Jan 27, 1981
Filed: May 10, 1979
Inventor
Frank E. Keske
Assignee (at issue)
Caterpillar Tractor Co.
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.