Patents by Inventor Lester L. Ritter

Lester L. Ritter 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).

  • Apparatus for improving impact tool lubrication
    Patent number: 5377770
    Abstract: An impact tool having an air-operated hammer for impacting against an anvil in the body of the tool to cause the tool to tunnel through the ground, and having passages and conduits opening to the front region of the tool to pass water to lubricate the tool and wet the soil proximate the front of the tool, to ease the passage of the tool through the soil during the propulsion of the tool.
    Type: Grant
    Filed: March 23, 1993
    Date of Patent: January 3, 1995
    Inventor: Lester L. Ritter
  • Impact tool for tunneling
    Patent number: 4749050
    Abstract: An impact tool having an air-operated hammer for impacting against an anvil in the body of the tool to cause the tool to tunnel through the ground and having passages and conduits opening to the front tip of the tool to pass water to lubricate the tool to ease the passage of the tool through the soil during the propulsion of the tool, the front tip further having a headpiece through which the passages open to the tool exterior surface.
    Type: Grant
    Filed: February 13, 1987
    Date of Patent: June 7, 1988
    Inventor: Lester L. Ritter
  • Directional impact tool for tunneling
    Patent number: 4144941
    Abstract: A hole-driving tool having an air-operated hammer for impacting against an anvil in the body of the tool to cause the tool to tunnel through the ground, wherein the direction of travel is controlled by providing a variable mass distribution over the hammer and anvil combination, and controlling the relative impact position of the hammer against the anvil.
    Type: Grant
    Filed: September 30, 1977
    Date of Patent: March 20, 1979
    Inventor: Lester L. Ritter