Patents by Inventor Robert O. York

Robert O. York 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).

  • Polystyrene foams containing 1,1-defluoroethane
    Patent number: 5204169
    Abstract: This invention relates to the use of polyfluorocarbon blowing agents in the preparation of polymer foams; particularly the use of 1,1-difluoroethane in the preparation of polystyrene foams for food packaging and food serving.
    Type: Grant
    Filed: August 3, 1992
    Date of Patent: April 20, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Robert O. York
  • Foam blowing agent composition and process for producing foams
    Patent number: 5147896
    Abstract: This invention relates to the use of polyfluorocarbon blowing agents in the preparation of polymer foams; particularly the use of 1,1-difluoroethane in the preparation of polystyrene foams for food packaging and food serving.
    Type: Grant
    Filed: May 20, 1991
    Date of Patent: September 15, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Robert O. York
  • Degradable foam materials
    Patent number: 5134171
    Abstract: Closed cell rigid polyhydroxy acid resin compositions foamed with environmentally benign, which compositions are degradable and cause minimal environmental impact when discarded.
    Type: Grant
    Filed: January 27, 1992
    Date of Patent: July 28, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Howard S. Hammel, Robert O. York