Patents by Inventor William McDowall

William McDowall 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).

  • System for detecting solid obstacles between confronting surfaces of pressure plates
    Patent number: 4473345
    Abstract: An inlet gas pressure passageway is associated with the movable mold section of a molding press and terminates at and therefore in the plane of the surface of said movable mold section which confronts the surface of the fixed mold section of the press. An outlet gas pressure passageway is associated with the fixed mold section and terminates at and therefore in the plane of the surface of said fixed mold section in alignment with the inlet passageway opening. Air or other gas under a predetermined superatmospheric is applied to the inlet passageway for delivery to the outlet passageway, and the latter is connected to a pressure switch operable at said predetermined gas pressure to effect application of high hydraulic closing pressure to the movable mold section.
    Type: Grant
    Filed: August 11, 1982
    Date of Patent: September 25, 1984
    Assignee: Hull Corporation
    Inventor: William McDowall