Patents by Inventor Elliott H. Blackwell

Elliott H. Blackwell 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).

  • Axial thrust adjustment for dual screw-type pump
    Patent number: 4017223
    Abstract: A dual screw-type pump is provided with a means for balancing the resultant dynamic axial thrust on the screw assemblies during operation of the pump. The resultant thrust on each assembly is absorbed in part by a circular piston on the assembly near the rear of the pump and the remainder by a thrust bearing engaged with the assembly near the front of the pump. The longitudinal position of one of the screw assemblies is selectively adjustable relative to the position of the other screw assembly to balance the thrust on the screw assemblies.
    Type: Grant
    Filed: March 24, 1975
    Date of Patent: April 12, 1977
    Assignee: Houdaille Industries, Inc.
    Inventor: Elliott H. Blackwell