Patents by Inventor David F. Lawson

David F. 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).

  • Patent number: 5069927
    Abstract: A composite comprises a coating which is adhered to a highly saturated elastomer having a corona discharge activated surface which is chemically fixed by a halogenating agent. A coating such as a paint, a weather-resistant film, etc., or an adhesive layer, is adhered to the activated and fixed surface. Various halogenating agents include N-halohydantoins, N-haloimides, N-haloamides, aqueous chlorine or bromine solutions, and acidified hypochlorite solutions. The composite is useful for EPDM roofing and consumer goods, e.g., a flexible polyurethane paint applied to the sidewalls of tires, as a decorated article, bonded composites, and the like.
    Type: Grant
    Filed: February 15, 1991
    Date of Patent: December 3, 1991
    Assignee: Bridgestone/Firestone, Inc.
    Inventors: David F. Lawson, Lynn A. Bryant
  • Patent number: 5066729
    Abstract: A process is provided for preparing a terminally functionalized polymer from a living polymer obtained by anionic polymerization of a diene monomer or mixture of a diene monomer and a vinyl aromatic hydrocarbon monomer which comprises reacting the living polymer with a compound having the formula: ##STR1## wherein R.sub.1 and R.sub.2 are selected from the group consisting of H, alkyl, cycloalkyl, aryl, dialkylaminoaryl, aralkyl, and aprotic O, N and S- containing alkyl, cycloalkyl, aryl and aralkyl groups; wherein R.sub.3 is selected from the group consisting of alkyl, cycloalkyl, aryl, dialkylaminoaryl, aralkyl, and aprotic O, N and S- containing alkyl, cycloalkyl, aryl and aralkyl groups; with the proviso that at least one of the R.sub.1, R.sub.2 and R.sub.3 groups must be a dialkylaminoaryl group and that not all of the R.sub.1, R.sub.2 and R.sub.3 groups can be aryl groups.
    Type: Grant
    Filed: April 9, 1990
    Date of Patent: November 19, 1991
    Assignee: Bridgestone/Firestone, Inc.
    Inventors: Mark L. Stayer, Jr., Thomas A. Antkowiak, David F. Lawson, Russell W. Koch
  • Patent number: 5055545
    Abstract: A composite comprises a coating which is adhered to an unsaturated usually cured elastomer utilizing a rubber-urethane adhesive having azoeneophile functionalities such as a dihydrocarbylazodicarboxylate, a dihydrocarbylazodicarboxamide, a dihydrocarbylazoesteramide, or the oxidized reaction product of a urethane prepolymer and a carbazate. A particularly useful carrier for the azoeneophiles is an isocyanate-terminated polyol prepolymer. The composite is useful when a paint is applied to consumer goods, e.g., as a flexible polyurethane paint applied to the sidewalls of tires, as a decorated article, as an adhesively bonded elastomeric composite, and the like.
    Type: Grant
    Filed: May 18, 1989
    Date of Patent: October 8, 1991
    Assignee: Bridgestone/Firestone, Inc.
    Inventor: David F. Lawson
  • Patent number: 4942093
    Abstract: A thermosetting adhesive comprising a bismaleimide compound and an isocyanate-terminated rubber polymer adapted to coreact upon heating is applied to substrate surfaces of a cured polyurethane and an uncured rubber compound. Upon heating, the adhesive crosslinks and the uncured rubber compound is preferably cured simultaneously. The adhesive is particularly useful in the fabrication of compositions by the bonding of cured polyurethane to an uncured rubber compound which becomes cured during the bonding process, such as in the construction of tires containing cured polyurethane reinforcements within uncured rubber carcasses, the retreading of tires containing polyurethane repairs, etc.
    Type: Grant
    Filed: September 9, 1988
    Date of Patent: July 17, 1990
    Assignee: Bridgestone/Firestone, Inc.
    Inventor: David F. Lawson
  • Patent number: 4454280
    Abstract: The incorporation of an alkaline earth hydroxide or oxide in a non-nitrogen-containing polymer results in the reduction of carbon monoxide and visible smoke generated during burning of the polymer. The polymer may be an elastomer, (that is a rubber), a thermoplastic, a thermoplastic elastomer, or a thermoset containing from 25 to about 400 parts of the alkaline earth metal compound per 100 parts of the polymer. A small amount of transition metal salts has further been found to greatly reduce the amount of carbon monoxide generated.
    Type: Grant
    Filed: July 29, 1982
    Date of Patent: June 12, 1984
    Assignee: The Firestone Tire & Rubber Company
    Inventor: David F. Lawson
  • Patent number: 4383071
    Abstract: An elastomeric flame and smoke retardant graft copolymer consisting essentially of a backbone copolymer derived from a conjugated diene and butyl acrylate and a side chain polymer derived from vinylidene chloride is prepared by polymerization under emulsion conditions. The graft copolymer may contain from 10 to 70 percent by weight of units derived from the conjugated diene, from 5 to 40 percent by weight of units derived from butyl acrylate and from 15 to 75 percent by weight of units derived from vinylidene chloride. In addition to excellent flame and smoke retardant characteristics, the graft copolymer exhibits excellent low temperature flexibility. The graft copolymers can be utilized in applications such as cushioning, insulation and coating applications where such characteristics are of major importance.
    Type: Grant
    Filed: May 4, 1981
    Date of Patent: May 10, 1983
    Assignee: The Firestone Tire & Rubber Company
    Inventors: David F. Lawson, Robert A. Hayes, Alan G. Altenau
  • Patent number: 4361668
    Abstract: The incorporation of an alkaline earth hydroxide or oxide in a non-nitrogen-containing polymer results in the reduction of carbon monoxide and visible smoke generated during burning of the polymer. The polymer may be an elastomer, (that is a rubber), a thermoplastic, a thermoplastic elastomer, or a thermoset containing from 25 to about 400 parts of the alkaline earth metal compound per 100 parts of the polymer. A small amount of transition metal salts has further been found to greatly reduce the amount of carbon monoxide generated.
    Type: Grant
    Filed: March 31, 1981
    Date of Patent: November 30, 1982
    Assignee: The Firestone Tire & Rubber Company
    Inventor: David F. Lawson
  • Patent number: 4072651
    Abstract: Tetrametaphosphimic acid [HNPO(OH)].sub.4.XH.sub.2 O and its salts are useful as flame retardants, for synthetic resins and natural materials.
    Type: Grant
    Filed: September 20, 1972
    Date of Patent: February 7, 1978
    Assignee: The Firestone Tire & Rubber Company
    Inventor: David F. Lawson
  • Patent number: 3957722
    Abstract: The incorporation of a combination of [1] a bromine-releasing flame-retarding compound (e.g., tetrabromobenzene, hexabromobenzene, decabromodiphenyl oxide, etc.) and [2] a zinc O,O-dihydrocarbyl phosphorodithioate (e.g., a dialkyl or diaryl derivative) or a chelated complex containing vanadium (III) or manganese (II) (e.g., such as acetonylacetonate, etc.) in a polybutadiene resin, renders the resin flame resistant.
    Type: Grant
    Filed: January 16, 1975
    Date of Patent: May 18, 1976
    Assignee: The Firestone Tire & Rubber Company
    Inventors: David F. Lawson, Delmar F. Lohr, Jr.
  • Patent number: T995004
    Abstract: The flammability of acrylonitrile-butadiene-sytrene resin is significantly decreased by adding thereto a combination of a brominated aromatic ether and iron or chromium naphthenate.The brominated aromatic ethers which may be used are illustrated by the generalized structure: ##STR1## in which x is 2 to 5 and y is 0 to 5, provided x plus y equals at least 2. Examples of these compounds include decabromodiphenyl oxide, octabromodiphenyl oxide, hexabromodiphenyl oxide, pentabromodiphenyl oxide or tetrabromodiphenyl oxide.The ABS resins which can be treated include the terpolymer produced by polymerization of acrylonitrile, butadiene and stryene monomers, as well as terpolymers produced by grafting acrylonitrile and styrene on polybutadiene, or blends of the component polymers.
    Type: Grant
    Filed: July 26, 1976
    Date of Patent: June 3, 1980
    Assignee: The Firestone Tire & Rubber Co.
    Inventor: David F. Lawson