Patents by Inventor John J. Roderick

John J. Roderick 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 pressure polyethylene process
    Patent number: 4382132
    Abstract: A process for the high pressure polymerization of ethylene in a reactor in the presence of conventional free radical generating initiators, wherein the initiator material is admixed with certain additives in small concentrations to lower the polymerization initiation temperature.
    Type: Grant
    Filed: June 1, 1981
    Date of Patent: May 3, 1983
    Assignee: El Paso Polyolefins Company
    Inventors: Joseph M. Kelley, John J. Roderick
  • Stabilized polyolefin compositions
    Patent number: 4374230
    Abstract: Polyolefin resins are rendered stable against degradation caused by exposure to heat and oxygen in the presence of copper by the incorporation of a novel polymeric stabilizer functioning dually as an antioxidant and a chelating agent.
    Type: Grant
    Filed: March 28, 1979
    Date of Patent: February 15, 1983
    Assignee: El Paso Polyolefins Company
    Inventors: John L. H. Allan, Arnold B. Finestone, John J. Roderick
  • Stabilized polyolefin compositions
    Patent number: 4298521
    Abstract: Polyolefin resins are rendered stable against degradation caused by exposure to heat and oxygen in the presence of copper by the incorporation of a novel polymeric stabilizer functioning dually as an antioxidant and a chelating agent.
    Type: Grant
    Filed: March 28, 1979
    Date of Patent: November 3, 1981
    Assignee: El Paso Polyolefins Company
    Inventors: John L. H. Allan, Arnold B. Finestone, John J. Roderick
  • Stabilized polyolefin compositions
    Patent number: 4279809
    Abstract: Polyolefin resins are rendered stable against degradation caused by exposure to heat and oxygen in the presence of copper by the incorporation of a novel polymeric stabilizer functioning dually as an antioxidant and a chelating agent.
    Type: Grant
    Filed: July 14, 1976
    Date of Patent: July 21, 1981
    Assignee: El Paso Polyolefins Company
    Inventors: John L. H. Allan, Arnold B. Finestone, John J. Roderick