Patents by Inventor Roland P. Holt

Roland P. Holt has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Nonrotary piston for jackhammer and removable splined nut therefor
    Patent number: 5350025
    Abstract: A fluid-activated, percussive impact tool has a piston therein that reciprocates longitudinally but not rotationally. The piston activates a wrap spring clutch to rotate the drill steel. A removable splined nut in combination with the tool's housing restrains rotation of the piston, while permitting longitudinal reciprocation of the piston.
    Type: Grant
    Filed: October 12, 1993
    Date of Patent: September 27, 1994
    Assignee: Ingersoll-Rand Company
    Inventors: Paul B. Campbell, Robert R. Kimberlin, Sean M. O'Malley, Roland P. Holt