Patents by Inventor Stephen W. Hopgood

Stephen W. Hopgood 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 filter with external adjustment of blowback valve
    Patent number: 5164086
    Abstract: Rotary filter including a perforated, rotatable drum and at least one blowback valve located in close proximity to the interior surface of the drum. In a preferred embodiment, the blowback valve includes an opening adjacent the drum for the discharge of a gas and the opening includes at least one radial position adjusting device alignable with a hole in the perforated drum, whereby the radial position of the blowback valve in relation to the interior of the drum is adjustable externally through perforations in the drum. The external adjustment permits drums longer than possible with prior art rotary filters.
    Type: Grant
    Filed: October 11, 1990
    Date of Patent: November 17, 1992
    Assignee: Baker Hughes Incorporated
    Inventors: Stephen W. Hopgood, Lester Klein