Patents by Inventor Dudley E. J. Ward

Dudley E. J. Ward 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).

  • Vacuum seal
    Patent number: 5292226
    Abstract: In FIG. 5, a rotor (22.sup.1) has a sealing face (24.sup.1) provided with a plurality of grooves (33.sup.1) in which a sealing fluid can be held by counter-balanced centrifugal and pressure differential forces as the rotor (22.sup.1) rotates to form a seal across the sealing face (24.sup.1). In alternative embodiments the grooves (33) can be of constant width and/or not radially disposed. In a specific use, the sealing arrangement seals a vacuum in a milk concentrator.
    Type: Grant
    Filed: January 21, 1992
    Date of Patent: March 8, 1994
    Assignee: Milcon Developments (NZ) Limited
    Inventor: Dudley E. J. Ward