Patents by Inventor Richard Desmarais

Richard Desmarais 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).

  • Method of welding thermoplastic film
    Patent number: 5449428
    Abstract: A method of welding at least two layers of a thermoplastic film which comprises a copolymer or copolymer-polymer mixture selected from the group consisting of ethylenevinylacetate (EVA) copolymer, an EVA copolymer and polyethylene, an EVA copolymer and polypropylene, and an EVA copolymer and polyethylene and polypropylene, with the proviso that the concentration of vinylacetate in said film is from about 12 to about 28% by weight, said method comprising the steps of:pressing said at least two layers of said thermoplastic film;applying a high frequency current to said pressed layers in order to weld said layers together; andrecovering said welded layers.
    Type: Grant
    Filed: May 3, 1994
    Date of Patent: September 12, 1995
  • Method of welding thermoplastic film
    Patent number: RE35991
    Abstract: A method of welding at least two layers of a thermoplastic film which comprises a copolymer or copolymer-polymer mixture selected from the group consisting of ethylenevinylacetate (EVA) copolymer, an EVA copolymer and polyethylene, an EVA copolymer and polypropylene, and an EVA copolymer and polyethylene and polypropylene, with the proviso that the concentration of vinylacetate in said film is from about 12 to about 28% by weight, said method comprising the steps of:pressing said at least two layers of said thermoplastic film;applying a high frequency current to said pressed layers in order to weld said layers together; andrecovering said welded layers.
    Type: Grant
    Filed: October 14, 1997
    Date of Patent: December 15, 1998