Patents by Inventor Fredrick Douglas

Fredrick Douglas 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).

  • Patent number: 4181312
    Abstract: A slinger device installed between a pump housing and bearing housing to deflect liquid leaking from the pump housing away from the bearings. The slinger is in the form of an annular disc mounted on the shaft of the pump impeller and sealed thereto by a pair of o-rings. Triangular vanes on the disc propel leaking liquid outwardly by centrifugal action. A ridge is formed between each pair of vanes to direct liquid toward the sides of the vanes along flat surfaces of the disc extending between the ridge and vane.
    Type: Grant
    Filed: May 11, 1978
    Date of Patent: January 1, 1980
    Inventor: Fredrick Douglas
  • Patent number: D394910
    Type: Grant
    Filed: March 29, 1996
    Date of Patent: June 2, 1998
    Inventor: Fredrick Douglas Volker