Patents by Inventor Leo L. Roberts

Leo L. Roberts 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).

  • Submersible pump impeller locking method
    Patent number: 4483660
    Abstract: A method of installing the diffusers and impellers on a shaft of a centrifugal pump uses a latent locking member. The locking member is positioned within a counterbore of each impeller when the impellers are placed on the shaft between each diffuser. After positioning, the locking member is activated to bond the impellers to the shaft. Preferably, the locking member is a heat activated material that requires heat for the material to become fluid. On cooling, the adhesive forms a rigid bond with the shaft.
    Type: Grant
    Filed: May 14, 1982
    Date of Patent: November 20, 1984
    Assignee: Hughes Tool Company
    Inventor: Leo L. Roberts
  • Tandem thrust bearing
    Patent number: 4275938
    Abstract: A tandem thrust bearing arrangement associated with a rotating shaft which is subjected to an axial load having spaced first and second annular members or thrust runners fixed to the shaft and first and second thrust bearings associated with the respective annular members and means axially movable with respect to the shaft supporting one of the thrust bearings which activates pivotable means applying load to the other thrust bearing.
    Type: Grant
    Filed: November 21, 1979
    Date of Patent: June 30, 1981
    Assignee: Centrilift-Hughes, Inc.
    Inventor: Leo L. Roberts
  • Impeller for a magnetically coupled pump
    Patent number: 4135863
    Abstract: An improved impeller for a pump of the type wherein the impeller is sealed within a pump housing and driven by a rotating external drive magnet magnetically coupled to an impeller magnet forming a portion of the impeller.
    Type: Grant
    Filed: September 30, 1977
    Date of Patent: January 23, 1979
    Assignee: Little Giant Corporation
    Inventors: Lee W. Davis, James S. Hollingsworth, Leo L. Roberts
  • Pump
    Patent number: D244750
    Type: Grant
    Filed: October 8, 1975
    Date of Patent: June 21, 1977
    Assignee: Little Giant Corporation
    Inventors: Leo L. Roberts, Lee W. Davis, Jim S. Hollingsworth