Patents by Inventor John Tregidgo

John Tregidgo 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).

  • Device for treating and conditioning engine coolant
    Patent number: 5435346
    Abstract: A device for treating and conditioning engine coolant for use with an internal combustion engine includes a housing having an inlet and outlet and a filtering media and container carrying coolant treatment material located within the housing. Coolant passes through the filter, and then is exposed to the tip of a rod which erodes away to permit treatment material to be discharged in the coolant. As the corrosiveness of the coolant decreases, erosion of the rod is discontinued, so that additional treatment material is no longer discharged into the coolant. Accordingly, the corrosiveness of the coolant is controlled to within relatively narrow limits.
    Type: Grant
    Filed: February 14, 1994
    Date of Patent: July 25, 1995
    Assignee: AlliedSignal Inc.
    Inventors: John Tregidgo, Francis J. Regina, Arthur T. Walsh, Ronald P. Rohrbach, Thirumalai G. Palanisamy, Gordon W. Jones, Gilbert C. Reynolds