Patents by Inventor John A. Sheaffer

John A. Sheaffer 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).

  • Rotary vacuum disc filter
    Patent number: 4207190
    Abstract: A rotary vacuum disc filter having a rotatable center shaft assembly mounting a plurality of filter discs each comprised of a like number of removable filter sectors aligned in horizontal rows, with each row connected to one of a plurality of longitudinally extending filtrate channels in the center shaft assembly wherein the outlet port of a selected channel at one end of the center shaft assembly may be selectively closed by a removable sealing plate to cut off flow from such channel.
    Type: Grant
    Filed: January 3, 1978
    Date of Patent: June 10, 1980
    Assignee: Dorr-Oliver Incorporated
    Inventor: John A. Sheaffer
  • Endless filter belt
    Patent number: 3965011
    Abstract: Endless filter belt for rotary vacuum drum filters, featuring a novel improved belt connection whereby the transverse terminal end portions of a length of filter belt are separably joined together by the use of a novel combination of press type closure pile fabrics or materials, capable of absorbing any longitudinal tension stresses in the filter belt, while readily deformable from the initial transverse linear extent.
    Type: Grant
    Filed: May 5, 1975
    Date of Patent: June 22, 1976
    Assignee: Dorr-Oliver Incorporated
    Inventor: John A. Sheaffer