Patents by Inventor Harold R. Penton

Harold R. Penton 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).

  • Aryloxy-alkoxy-allylphenoxy substituted polyphosphazenes
    Patent number: 4602048
    Abstract: Polyphosphazene elastomers for use in making low density foam comprising a --P<.dbd.N].sub.n substantially linear backbone randomly substituted with 20-80 mole percent phenoxy, 20-80 mole percent lower alkylphenoxy, 1-50 mole percent alkoxy and 0.5-20 mole percent alkenylphenoxy and the foamed products made therefrom.
    Type: Grant
    Filed: November 20, 1985
    Date of Patent: July 22, 1986
    Assignee: Ethyl Corporation
    Inventors: Harold R. Penton, F. Alexander Pettigrew
  • Mammary implant
    Patent number: 4592755
    Abstract: A prosthesis for subcutaneous implantation such as a mammary implant used in reconstructive surgery is made from a polyphosphazene elastomer (e.g. polyfluoroalkoxy phosphazene) sac containing a silicone gel. The sac is essentially impermeable to the silicone gel fill and overcomes a gel migration problem encountered with implants made using polysiloxane sacs.
    Type: Grant
    Filed: June 11, 1985
    Date of Patent: June 3, 1986
    Assignee: Ethyl Corporation
    Inventors: Harold R. Penton, Michael E. Kucsma, F. Alexander Pettigrew
  • Aryloxy-alkoxy substituted polyphosphazenes
    Patent number: 4567229
    Abstract: Polyphosphazenes containing 20-80 mole percent phenoxy, 20-80 mole percent alkylphenoxy and 2-30 mole percent alkoxy substituents possess low glass transition temperature while still exhibiting good smoke values in standard tests.
    Type: Grant
    Filed: December 18, 1984
    Date of Patent: January 28, 1986
    Assignee: Ethyl Corporation
    Inventors: F. Alexander Pettigrew, Harold R. Penton
  • Polyphosphazene process
    Patent number: 4514550
    Abstract: Phosphonitrilic chloride polymers are substituted with aryloxide or alkoxide groups by reaction with an alkali metal aryloxide or alkoxide in a single liquid hydrocarbon reaction medium, e.g. cyclohexane, toluene and the like, in which the aryloxides or alkoxides are essentially insoluble and in which the substituted product is soluble.
    Type: Grant
    Filed: May 9, 1984
    Date of Patent: April 30, 1985
    Assignee: Ethyl Corporation
    Inventor: Harold R. Penton