Patents by Inventor Thomas W. Donaldson

Thomas W. Donaldson 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).

  • Wheel device for removing fluid from a fluid carrying chain
    Patent number: 4994116
    Abstract: A fluid carrying chain is drawn between the interface of circumferentially abutting wheel members having pockets in the circumferential edge faces thereof configured to the shape of the link members of the chain such that each link member becomes snugly enveloped in its own chamber thereby expelling fluid from the link member.
    Type: Grant
    Filed: May 28, 1985
    Date of Patent: February 19, 1991
    Inventor: Thomas W. Donaldson
  • Device for recovering fluid from a well
    Patent number: 4712667
    Abstract: An endless chain of link members having oil accumulating cavities disposed therein is circulated in a well at a controlled rate carrying oil to the surface where same is dumped and removed by brush and wipers.
    Type: Grant
    Filed: March 26, 1985
    Date of Patent: December 15, 1987
    Inventors: Owen E. Jackson, Thomas W. Donaldson
  • Down-well pump device
    Patent number: 4636145
    Abstract: A pump is positioned in the oil producing zone of a well to pump fluid therefrom and is driven by an oil accumulating chain used to recover oil from the well in conjunction with associated secondary drive means.
    Type: Grant
    Filed: May 28, 1985
    Date of Patent: January 13, 1987
    Inventor: Thomas W. Donaldson