Patents by Inventor James B. Fitch

James B. Fitch 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).

  • Liquid ring pump
    Patent number: 4273515
    Abstract: An improved liquid ring pump includes an impeller having a prime number of radial blades, preferably thirteen, which reduce pump noise and vibration by eliminating subharmonics due to blade pairing.
    Type: Grant
    Filed: December 11, 1978
    Date of Patent: June 16, 1981
    Assignee: General Signal Corporation
    Inventor: James B. Fitch
  • Liquid ring pump
    Patent number: 4132504
    Abstract: An improved liquid ring pump includes an impeller having a larger axial length to diameter ratio than found in the prior art, with suction ports at both ends of the impeller. The number of impeller blades is chosen to be a prime number, preferably thirteen, to reduce pump noise and vibration. The pump housing includes novel manifolding for parallel or compound pump arrangements having two impellers, with suction ports at both ends of at least one impeller. A unique joint configuration between housing sections is also disclosed.
    Type: Grant
    Filed: April 7, 1976
    Date of Patent: January 2, 1979
    Assignee: General Signal Corporation
    Inventor: James B. Fitch
  • Liquid ring pump
    Patent number: D245501
    Type: Grant
    Filed: April 7, 1976
    Date of Patent: August 23, 1977
    Assignee: General Signal Corporation
    Inventor: James B. Fitch