Patents by Inventor Martin W. Do Boer Hignett

Martin W. Do Boer Hignett 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).

  • Mechanical face seal with trapezoidal shaped grooves on a sealing face
    Patent number: 5222743
    Abstract: A mechanical face seal includes a first sealing ring mounted non-rotatably and sealed with respect to a shaft and a second sealing ring mounted non-rotatably and sealed with respect to a housing, the second sealing ring being mounted in axial alignment with the first sealing ring and springs being provided to urge sealing faces of the first and second sealing rings into sealing engagement. The sealing face of the first sealing ring is provided with a plurality of grooved areas spaced angularly around its circumference, the grooved areas opening to one edge of the sealing face, a continuous annular dam formation being provided between the grooved areas and the other edge of the sealing face.
    Type: Grant
    Filed: January 31, 1992
    Date of Patent: June 29, 1993
    Assignee: John Crane (UK) Limited
    Inventors: Ian M. Goldswain, Martin W. Do Boer Hignett