Patents by Inventor Philip T. Selfridge

Philip T. Selfridge 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).

  • High strength asphalt cement paving composition
    Patent number: 4801332
    Abstract: A paving composition formed of aggregate and asphalt cement in which the asphalt cement is treated with a combination of a primary catalyst comprising a compound chosen from the group consisting of asphalt cement soluble organic-manganese, organic-cobalt, and organic-copper compounds, or a mixture of two or more thereof, and a secondary catalyst comprising an asphalt cement soluble organic-iron compound.
    Type: Grant
    Filed: June 15, 1987
    Date of Patent: January 31, 1989
    Assignee: Chemcrete International Corp.
    Inventors: Philip T. Selfridge, John B. Leonard, Jr., Patrick K. Clancey
  • Modified asphalt paving compositions
    Patent number: 4244747
    Abstract: A modified asphalt cement including manganese chloride (MnCl.sub.2) dispersed throughout the asphalt cement. A paving composition including the above material forming a binder for aggregate used for paving roads or the like.
    Type: Grant
    Filed: March 12, 1979
    Date of Patent: January 13, 1981
    Assignee: Chem-Crete Corporation
    Inventors: John B. Leonard, Jr., Philip T. Selfridge