Patents by Inventor David Francis Lawson

David Francis Lawson 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).

  • Smoke-retardant chlorinated polymer compositions
    Patent number: 4096116
    Abstract: The addition of cobalt, zinc, iron or manganese salts of hydroxycarboxylic or dicarboxylic acids containing 2 to 6 carbon atoms to halogenated polymer resin compositions greatly reduces the evolution of smoke when the compositions undergo combustion processes. These salts exhibit synergistic smoke suppressing action when used along with aluminum hydroxide.
    Type: Grant
    Filed: October 1, 1976
    Date of Patent: June 20, 1978
    Assignee: The Firestone Tire & Rubber Company
    Inventor: David Francis Lawson
  • Poly(phosphazene) compositions
    Patent number: 4064095
    Abstract: Poly(phosphazene) compositions exhibiting excellent flame resistance and low smoke output are produced by the addition of fillers from a class of fillers which decompose endothermically when heated to an appropriate temperature. The compositions may also include plasticizers such as triarylphosphates. The resulting compositions are particularly useful as coatings for wire and cable members.
    Type: Grant
    Filed: July 15, 1976
    Date of Patent: December 20, 1977
    Assignee: The Firestone Tire & Rubber Company
    Inventors: Arthur Eugene Oberster, David Francis Lawson
  • Smoke and flame retarded styrene polymers
    Patent number: 4059560
    Abstract: The evolution of smoke and the development of flame are retarded by the incorporation of hydrated magnesium oxychloride into organic polymers which contain aromatic components, particularly polymers and copolymers of styrene. The hydrated magnesium oxychloride has the added advantage that it has low tinting strength, i.e., does not greatly change the color or appearance of the polymers.
    Type: Grant
    Filed: May 5, 1976
    Date of Patent: November 22, 1977
    Assignee: The Firestone Tire & Rubber Company
    Inventors: David Francis Lawson, Edward Leo Kay
  • Smoke-retardant chlorinated polymer compositions
    Patent number: 4035324
    Abstract: The addition of Manganese borate (Mn B.sub.4 O.sub.7) to flexible vinyl chloride resin compositions greatly reduces the evolution of smoke when the compositions undergo combustion processes.
    Type: Grant
    Filed: May 5, 1976
    Date of Patent: July 12, 1977
    Assignee: The Firestone Tire & Rubber Company
    Inventors: David Francis Lawson, Edward Leo Kay
  • Smoke-inhibited polymer compositions
    Patent number: 4005248
    Abstract: The evolution of smoke from the combustion of organic polymers which contain aromatic moieties, especially polymers of styrene, with and without other monomers, is reduced materially by forming a complex of the polymer and chromium carbonyl.
    Type: Grant
    Filed: June 10, 1975
    Date of Patent: January 25, 1977
    Assignee: The Firestone Tire & Rubber Company
    Inventors: David Francis Lawson, Jung Wong Kang
  • Flame and smoke retardants for polyvinyl chloride
    Patent number: 3957723
    Abstract: Aluminum oxide trihydrate and zinc oxide function synergistically in reducing the flammability of polyvinyl chloride and in reducing the maximum smoke intensity generated in the combustion of the aluminum oxide trihydrate, zinc oxide, polyvinyl chloride combination.
    Type: Grant
    Filed: June 27, 1975
    Date of Patent: May 18, 1976
    Assignee: The Firestone Tire & Rubber Company
    Inventors: David Francis Lawson, Edward Leo Kay