Patents by Inventor Roy M. Freeman

Roy M. Freeman 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 modulus low hysteresis rubber compound for pneumatic tires
    Patent number: 5494091
    Abstract: A sulfur-vulcanizable rubber compound, being devoid of peroxide components, having high modulus and low hysteresis properties subsequent to vulcanization. Such compounds comprise from about 25 to 55 parts by weight of polyisoprene; and from about 75 to 45 parts by weight of a diene polymer selected from the group consisting of homopolymers of conjugated diene monomers and copolymers thereof with monoolefin monomers and EPDM terpolymers to total 100 parts by weight of rubber polymer; from about 50 to 70 parts by weight of a reinforcing filler, per 100 parts by weight wherein at least a portion of at least one of the rubber polymers is grafted with a polymeric metal salt of an .alpha., .beta.-ethylenically unsaturated carboxylic acid to form an uncured graft rubber copolymer and at least about 4 parts by weight of a curative selected from the group consisting of sulfur and sulfur donors, per 100 parts by weight of rubber.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: February 27, 1996
    Assignee: Bridgestone Corporation
    Inventors: Roy M. Freeman, William L. Hergenrother, Frederick J. Ravagnani
  • High modulus low hysteresis rubber compound for pneumatic tires
    Patent number: 5494958
    Abstract: A sulfur-vulcanizable rubber compound, being devoid of peroxide components, having high modulus and low hysteresis properties subsequent to vulcanization. Such compounds comprise from about 25 to 55 parts by weight of polyisoprene; and from about 75 to 45 parts by weight of a diene polymer selected from the group consisting of homopolymers of conjugated diene monomers and copolymers thereof with monoolefin monomers and EPDM terpolymers to total 100 parts by weight of rubber polymer; from about 50 to 70 parts by weight of a reinforcing filler, per 100 parts by weight wherein at least a portion of at least one of the rubber polymers is grafted with a polymeric metal salt of an .alpha., .beta.-ethylenically unsaturated carboxylic acid to form an uncured graft rubber copolymer and at least about 4 parts by weight of a curative selected from the group consisting of sulfur and sulfur donors, per 100 parts by weight of rubber.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: February 27, 1996
    Assignee: Bridgestone Corporation
    Inventors: Roy M. Freeman, William L. Hergenrother, Frederick J. Ravagnani
  • High modulus low hysteresis rubber compound for pneumatic tires
    Patent number: 5464899
    Abstract: A sulfur-vulcanizable rubber compound, being devoid of peroxide components, having high modulus and low hysteresis properties subsequent to vulcanization. Such compounds comprise from about 25 to 55 parts by weight of polyisoprene; and from about 75 to 45 parts by weight of a diene polymer selected from the group consisting of homopolymers of conjugated diene monomers and copolymers thereof with monoolefin monomers and EPDM terpolymers to total 100 parts by weight of rubber polymer; from about 50 to 70 parts by weight of a reinforcing filler, per 100 parts by weight wherein at least a portion of at least one of the rubber polymers is grafted with a polymeric metal salt of an .alpha., .beta.-ethylenically unsaturated carboxylic acid to form an uncured graft rubber copolymer and at least about 4 parts by weight of a curative selected from the group consisting of sulfur and sulfur donors, per 100 parts by weight of rubber.
    Type: Grant
    Filed: March 31, 1994
    Date of Patent: November 7, 1995
    Assignee: Bridgestone Corporation
    Inventors: Roy M. Freeman, William L. Hergenrother, Frederick J. Ravagnani