Patents by Inventor Donald E. Bardsley

Donald E. Bardsley 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).

  • Apparatus for sealing a center valve vacuum filter
    Patent number: 5194153
    Abstract: A seal for a rotating center valve vacuum filter drum has a non-flat cross section with an elastomeric core and a chemical resistant sheathing. The seal is installed under tension so that, as wear occurs during operation, positive sealing contact is maintained. The non-flat cross section provides a nesting relationship with the center valve slot and stationary shoe to resist any tendency to wander out of the slot.
    Type: Grant
    Filed: December 6, 1991
    Date of Patent: March 16, 1993
    Assignee: Ingersoll-Rand Company
    Inventor: Donald E. Bardsley
  • Rotating drum end seal
    Patent number: 4821536
    Abstract: The seal has particular use as a seal in vats having a rotatable drum. The seal prevents material from getting between the ends of the drum and adjacent vat inside surface.
    Type: Grant
    Filed: June 22, 1988
    Date of Patent: April 18, 1989
    Assignee: Ingersoll-Rand Company
    Inventor: Donald E. Bardsley
  • Feeding device for use in filter presses
    Patent number: 4317724
    Abstract: The feeding device includes elastically deformable material which is deformed when compressed. Upon release of the compression, the material returns to its original shape thereby releasing potential energy to dislodge any cake tending to stick to the bottom of the device.
    Type: Grant
    Filed: May 23, 1980
    Date of Patent: March 2, 1982
    Assignee: Ingersoll-Rand Company
    Inventor: Donald E. Bardsley