Patents by Inventor Richard O. Whitehead

Richard O. Whitehead 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).

  • Rubberless high impact polypropylene
    Patent number: 4536537
    Abstract: Blends of propylene homopolymers, linear low density ethylene copolymers and certain plasticizer oils possess extremely good impact resistance at low temperatures (-30.degree. C.) along with good stiffness and blush.
    Type: Grant
    Filed: June 21, 1984
    Date of Patent: August 20, 1985
    Assignee: Shell Oil Company
    Inventors: G. Bruce Klingensmith, Richard O. Whitehead, Thair L. Higgins
  • Impact polymers
    Patent number: 4294937
    Abstract: Vinyl aromatic compositions having improved impact and toughness are disclosed comprising interpolymers containing a mixture of a polybutadiene rubber with a specific styrene-butadiene two-block copolymer and a poly(monovinylaromatic) compound.
    Type: Grant
    Filed: June 18, 1979
    Date of Patent: October 13, 1981
    Assignee: Shell Oil Company
    Inventor: Richard O. Whitehead
  • Styrenic impact polymers
    Patent number: 4267283
    Abstract: Vinyl aromatic compositions having improved impact and toughness are disclosed comprising interpolymers containing a mixture of a certain tapered S'B'S' copolymer and a certain SBS block copolymer with a poly(monovinyl aromatic) compound.
    Type: Grant
    Filed: June 16, 1980
    Date of Patent: May 12, 1981
    Assignee: Shell Oil Company
    Inventor: Richard O. Whitehead
  • Impact improved polymers
    Patent number: 4026969
    Abstract: Improved impact vinyl aromatic compositions are disclosed comprising interpolymers containing (A) from about two to about 25 parts by weight of a mixture of (1) a polybutadiene rubber with (2) a polyisoprene rubber in a weight ratio between 35:65 and 65:35; and (B) from about 98 to about 75 parts of at least one poly(monovinylaromatic) compound.
    Type: Grant
    Filed: November 12, 1975
    Date of Patent: May 31, 1977
    Assignee: Shell Oil Company
    Inventors: Simon Mostert, Richard O. Whitehead