Patents by Inventor Donald A. Boothroyd

Donald A. Boothroyd 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).

  • Non-woven depth filter cartridge
    Publication number: 20020063092
    Abstract: A new non-woven depth filter cartridge is formed by insertion of a core into filter mass formed in a continuous process. A mass of very fine diameter polymer filaments is overlaid by mass of larger diameter polymer filaments. The filaments are continuously accumulated on a spinning mandrel and advanced along and off of the mandrel by a press roller. An inner cylindrical surface of the cumulative filament mass forming the depth filter element is calendered, which facilitates insertion of a core member.
    Type: Application
    Filed: January 25, 2002
    Publication date: May 30, 2002
    Applicant: Osmonics, Inc.
    Inventors: Thomas M. Aune, Travis G. Stifter, Donald A. Boothroyd
  • Non-woven depth filter element
    Patent number: 6358417
    Abstract: A new non-woven depth filter element is formed in a continuous process whereby a mass of very fine diameter polymer filaments overlaid by mass of larger diameter polymer filaments are continuously accumulated on a spinning mandrel and advanced along and off of the mandrel by a press roller. An inner cylindrical surface of the cumulative filament mass forming the depth filter element is calendered, which facilitates insertion of a core member.
    Type: Grant
    Filed: April 21, 1999
    Date of Patent: March 19, 2002
    Assignee: Osmonics, Inc.
    Inventors: Thomas M. Aune, Travis G. Stifter, Donald A. Boothroyd