Patents by Inventor John W. Hirzy

John W. Hirzy 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).

  • Plastifiers, method of preparation and PVC compositions containing same
    Patent number: 4273890
    Abstract: Block copolyesters and block copolyesterurethanes are presented which are useful as plastifiers for PVC. The plastifiers, depending on process variations, contain ordered or random blocks of amorphous and semi-crystalline structure and are characterized as being highly compatible and substantially non-fugitive when blended with PVC.
    Type: Grant
    Filed: March 21, 1980
    Date of Patent: June 16, 1981
    Assignee: Monsanto Company
    Inventor: John W. Hirzy
  • Plastifiers, method of preparation and PVC compositions containing same
    Patent number: 4212957
    Abstract: Block copolyesters and block copolyesterurethanes are presented which are useful as plastifiers for PVC. The plastifiers, depending on process variations, contain ordered or random blocks of amorphous and semi-crystalline structure and are characterized as being highly compatible and substantially non-fugitive when blended with PVC.
    Type: Grant
    Filed: December 27, 1977
    Date of Patent: July 15, 1980
    Assignee: Monsanto Company
    Inventor: John W. Hirzy