Patents by Inventor Theodore J. Lang

Theodore J. Lang 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).

  • Patent number: 5169696
    Abstract: A transversely tearable film and pouches made therefrom are disclosed. The transversely tearable laminate comprises a machine direction oriented linear low density polyethylene film adhesively laminated on at least one side to a sealant film, the sealant film having an Elmendorf tear in the machine direction of at least about 2 g/.mu.m, and the selection of said oriented film and said sealant film being made on the basis that:K.X>(1-Y),whereinK is an empirically determined factor which depends of the properties of the oriented film and the sealant film,X is the thickness of all layers of sealant film in micrometers,Y=(MD.sub.c)/(TD.sub.c)MD.sub.c is the Elmendorf tear strength, in the machine direction, of the oriented film, measured in grams, andTD.sub.c is the Elmendorf tear strength, in the transverse direction, of the oriented film, measured in grams.
    Type: Grant
    Filed: November 1, 1991
    Date of Patent: December 8, 1992
    Assignee: Du Pont Canada Inc.
    Inventors: Theodore J. Lang, Kevin Bergevin
  • Patent number: 5091241
    Abstract: A transversely tearable film and pouches made therefrom are disclosed. The transversely tearable laminate comprises a machine direction oriented linear low density polyethylene film adhesively laminated on at least one side to a sealant film, the sealant film having an .Elmendorf tear in the machine direction of at least about 2 g/.mu.m, and the selection of said oriented film and said sealent film being made on the basis that:K.X>(1-Y),whereinK is an empirically determined factor which depends of the properties of the oriented film and the sealant film,X is the thickness of all layers of sealant film in micrometers,Y=(MD.sub.c)/(TD.sub.c)MD.sub.c is the Elmendorf tear strength, in the machine direction, of the oriented film, measured in grams, andTD.sub.c is the Elmendorf tear strength, in the transverse direction, of the oriented film, measured in grams.
    Type: Grant
    Filed: December 4, 1989
    Date of Patent: February 25, 1992
    Inventors: Theodore J. Lang, Kevin Bergevin
  • Patent number: 4565742
    Abstract: A film laminate comprising a base film and a first sealant web with a coating of polyvinylidene chloride (PVDC) sandwiched therebetween is disclosed. The first sealant web is selected from the group consisting of (a) film made from a copolymer of ethylene and vinyl acetate, and (b) a film made from a blend of (i) a copolymer of ethylene and vinyl acetate with (ii) a homopolymer of ethylene, or a copolymer of ethylene and one or more C.sub.4 to C.sub.10 .alpha.-olefins, said homopolymer or copolymer having a density of from about 0.915 to about 0.955 g/cm.sup.3, or blends of said homopolymer and copolymer. The base film is selected from the group consisting of oriented nylon film, oriented polyester film, oriented polypropylene film and a second sealant web, said second sealant web being selected from the same group as said first sealant web and having a slip coefficient of less than about 0.4.
    Type: Grant
    Filed: October 20, 1983
    Date of Patent: January 21, 1986
    Assignee: Du Pont Canada Inc.
    Inventor: Theodore J. Lang
  • Patent number: 4438180
    Abstract: A process for coating nylon film with polyvinylidene chloride is disclosed, comprising primer-coating the nylon film with an aqueous dispersion of a vinylidene chloride copolymer having a crystallinity index of less than 1.15 after 30 days' storage at 20.degree. C. and between about 1.05 and 1.20 when stored for 48 hours at 40.degree. C.; drying the primer-coated film; coating the primer-coated film with an aqueous dispersion of a vinylidene chloride copolymer capable of developing crystallinity to a level sufficient that the crystalline vinylidene chloride copolymer so-formed resists attack by an organic solvent, as measured by the Solvent Haze Test; and drying the coated film. During primer-coating and the first drying step, the film is kept under sufficient tension to prevent curling of the film. The coated film may be laminated to polyethylene to provide a laminate useful for packaging of processed food.
    Type: Grant
    Filed: August 16, 1982
    Date of Patent: March 20, 1984
    Assignee: Du Pont Canada Inc.
    Inventors: Theodore J. Lang, Bernard J. Kershaw