Patents by Inventor David H. Doolittle

David H. Doolittle 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).

  • Bitumen composition
    Patent number: 4878950
    Abstract: A bitumen composition comprising asphalt and a low molecular weight .alpha.-olefin homopolymer or copolymer. The composition is useful in the preparation of roofing coatings or materials and the cured roofing material will exhibit improved low temperature flexibility when compared to prior art roofing compositions. The composition may also contain other additives including high molecular weight polymers, fillers, fire retardants, anti-oxidants, anti-ozonants, pigments and the like.
    Type: Grant
    Filed: April 29, 1988
    Date of Patent: November 7, 1989
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Andrew Halasz, Giuseppe Spinelli, David H. Doolittle