Patents by Inventor Derek J. Watridge

Derek J. Watridge 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 drum filter
    Patent number: 4309288
    Abstract: An improved rotary filter is described. A baffle means is disposed between the filter drum and the filter cloth in substantial alignment with at least some of the circumferential openings in the filter drum to decrease the erosive effects on the filter cloth of fluid discharged through the circumferential openings in the filter drum.
    Type: Grant
    Filed: August 7, 1980
    Date of Patent: January 5, 1982
    Assignee: Exxon Research & Engineering Co.
    Inventors: Douglas G. Ryan, Derek J. Watridge