Patents by Inventor Gregory M. Holtzapple

Gregory M. Holtzapple 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).

  • Tire with tread of elastomer composition
    Patent number: 5504140
    Abstract: Pneumatic rubber tire with a tread composed of a rubber blend of a base of at least two synthetic elastomers composed of (i) specialized isoprene/butadiene copolymer elastomer having a low Tg in a range of about -70.degree. to about -100.degree. C. and (ii) a diene based elastomer having a Tg in a range of about -5.degree. to about -30.degree. C. together with a minor amount of natural cis 1,4-polyisoprene rubber. Selection of the base of the said two synthetic elastomers having spaced apart, or spatially defined, Tg's of at least 40.degree. C. is an important feature of the tread rubber blend. Representative examples of contemplated elastomers with Tg's in a range of about -5.degree. to about -30.degree. C. are 3,4-polyisoprene elastomer, styrene/isoprene copolymer elastomer and high vinyl polybutadiene elastomers.In one aspect, the tread rubber blend is reinforced with reinforcing filler composed of carbon black or a combination of carbon black and silica accompanied by a coupling agent.
    Type: Grant
    Filed: September 30, 1994
    Date of Patent: April 2, 1996
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: David J. Zanzig, Paul H. Sandstrom, John J. A. Verthe, Raymond R. DiRossi, Gregory M. Holtzapple
  • Rubber blend and tire with tread thereof
    Patent number: 5300577
    Abstract: A pneumatic tire with a tread comprising a blend of 3,4-polyisoprene rubber, cis 1,4-polybutadiene rubber, and a terpolymer of styrene/isoprene/butadiene. The triblend of the three basic elastomers when compounded and cured into a polymer network gives a high tan delta at 0.degree. C. associated with good wet traction and a low tan delta at 60.degree. C. which has been associated with low rolling resistance.
    Type: Grant
    Filed: February 6, 1992
    Date of Patent: April 5, 1994
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Raymond R. DiRossi, Gregory M. Holtzapple, Joseph K. Hubbell, Mark H. Seloover, John J. A. Verthe
  • Rubber blend and tire with tread thereof
    Patent number: 5087668
    Abstract: A pneumatic tire with a tread composed of a blend of 3,4-polyisoprene rubber, cis 1,4 polyisoprene rubber and at least one additional diene based rubber.
    Type: Grant
    Filed: May 9, 1991
    Date of Patent: February 11, 1992
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Paul H. Standstrom, J. Dale Massie, II, John J. A. Verthe, Gregory M. Holtzapple, Raymond R. DiRossi