Patents by Inventor David C. Bean

David C. Bean 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).

  • Apparatus for continuous preparation of sulfur asphalt binders and paving compositions
    Patent number: 4155654
    Abstract: Apparatus is disclosed for continuous preparation of a blend of liquid sulfur in fluid asphalt in specified proportions to provide a dispersion of fine sulfur droplets in the asphalt, particularly suitable for coating onto aggregate to form "hot mix" for asphalt concrete of improved strength.
    Type: Grant
    Filed: July 28, 1978
    Date of Patent: May 22, 1979
    Assignee: Gulf Canada Limited
    Inventors: Gerhard J. A. Kennepohl, Alan Logan, David C. Bean
  • Built-up roofing using sulfur asphalt
    Patent number: 4135022
    Abstract: The disclosure describes built-up roofing having improved resistance to spreading of fire, fabricated from two or more layers of felt impregnated with asphalt based saturant with asphalt based coating spread on top of each felt layer; the saturant asphalt or coating asphalt or both are blends of 90 - 45% asphalt with 10 - 55% sulfur. The roofing is built-up in the conventional manner by "mopping" fluid asphalt based coating onto felt layers impregnated with asphalt based impregnant. A protective layer of inert mineral aggregate (e.g. gravel) optionally covers the top coating.
    Type: Grant
    Filed: October 7, 1975
    Date of Patent: January 16, 1979
    Assignee: Gulf Canada Limited
    Inventors: Gerhard J. A. Kennepohl, Laverne J. Miller, David C. Bean
  • Asphalt impregnated felt building materials
    Patent number: 4079158
    Abstract: The disclosure describes asphalt saturated felt building materials, optionally having a mineral filled asphalt base coating thereon, in which the asphalt saturating the felt and/or the asphalt in any mineral filled coating is a blend of 10-55% sulfur dispersed in the asphalt. The materials are used in the conventional manner as roofing felt, roofing shingles, and in built-up roofing, to obtain improved fire resistance.
    Type: Grant
    Filed: October 7, 1975
    Date of Patent: March 14, 1978
    Assignee: Gulf Oil Canada Limited
    Inventors: Gerhard J. A. Kennepohl, Laverne J. Miller, David C. Bean