Patents by Inventor James F. Pilgrim

James F. Pilgrim 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).

  • Process for coating sheet substrates with thermoplastic polymer
    Patent number: 4143187
    Abstract: An improved process for coating sheet substrates with thermoplastic polymer is disclosed. In the process the sheet substrate forms one die lip of the extrusion coating die. The sheet substrate is passed from face-to-face contact with the metal block of the extrusion coating die into a spaced apart relationship with one die lip of the extrusion coating die, the sheet substrate forming the second die lip. Molten thermoplastic polymer is extruded into the space between the one die lip and the sheet substrate, thereby coating the sheet substrate with polymer. The preferred polymer is a poly-.alpha.-olefin, especially polyethylene or a copolymer of ethylene and butene-1. The preferred sheet substrate has orifices in the surfaces thereof. The process may be used to coat sheet substrates with a thermoplastic polymer, e.g. in the manufacture of form boards for the construction industry.
    Type: Grant
    Filed: December 1, 1977
    Date of Patent: March 6, 1979
    Assignee: Du Pont of Canada Limited
    Inventors: James F. Pilgrim, Ronald A. Hunter
  • Process for coating sheet substrates with thermoplastic polymer
    Patent number: RE30789
    Abstract: An improved process for coating sheet substrates with thermoplastic polymer is disclosed. In the process the sheet substrate forms one die lip of the extrusion coating die. The sheet substrate is passed from face-to-face contact with the metal block of the extrusion coating die into a spaced apart relationship with one die lip of the extrusion coating die, the sheet substrate forming the second die lip. Molten thermoplastic polymer is extruded into the space between the one die lip and the sheet substrate, thereby coating the sheet substrate with polymer. The preferred polymer is a poly-.alpha.-olefin, especially polyethylene or a copolymer of ethylene and butene-1. The preferred sheet substrate has orifices in the surfaces thereof. The process may be used to coat sheet substrates with a thermoplastic polymer, e.g. in the manufacture of form boards for the construction industry.
    Type: Grant
    Filed: November 26, 1979
    Date of Patent: November 3, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: James F. Pilgrim, Ronald A. Hunter