Patents by Inventor Lajos E. Keller

Lajos E. Keller 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).

  • Opaque film compositions
    Patent number: 5945205
    Abstract: An opaque, biaxially-oriented polymeric film contains a matrix of (i) a thermoplastic polymeric material in which there are dispersed (ii) void-initiating solid particles, about which there are located opacifying voids, and a minor amount of (iii) a light-absorbing pigment particles having lamellar morphology.
    Type: Grant
    Filed: July 29, 1998
    Date of Patent: August 31, 1999
    Assignee: Mobil Oil Corporation
    Inventors: Lajos E. Keller, Jean-Pierre Frognet
  • Uniaxially shrinkable biaxially oriented polypropylene film and its method of preparation
    Patent number: 5691043
    Abstract: A uniaxially heat-shrinkable, biaxially oriented, multilayer film having a polypropylene-containing core layer comprising at least 70 wt % of said multilayer film and at least one polyolefin-containing skin layer adjacent said core layer is prepared by biaxially orienting a coextrudate and thereafter orienting said coextrudate by stretching 10 to 40% in the machine direction. The core layer contains isotactic polypropylene and a modifier which reduces the crystallinity of the polypropylene by increasing chain imperfections or reducing isotacticity of the polypropylene-containing core. Such modifiers can be selected from the group consisting of atactic polypropylene, syndiotactic polypropylene, ethylene-propylene copolymer, propylene-butylene copolymer, ethylene-propylene-butylene terpolymer, and linear low density polyethylene. The skin layer can be selected from the group consisting of polypropylene, ethylene-propylene copolymer, polyethylene, and ethylene-propylene-butylene terpolymer.
    Type: Grant
    Filed: April 25, 1995
    Date of Patent: November 25, 1997
    Assignee: Mobil Oil Corporation
    Inventors: Lajos E. Keller, Marie-France Nothnagle
  • Multi-layer opaque film structures of reduced surface friction and process for producing same
    Patent number: 5264277
    Abstract: An opaque, biaxially oriented multi-layer polymeric film structure of reduced surface coefficient of friction.
    Type: Grant
    Filed: September 9, 1991
    Date of Patent: November 23, 1993
    Assignee: Mobil Oil Corp.
    Inventors: Jean-Pierre Frognet, Lajos E. Keller, Maurice Petitjean
  • Multi-layer opaque film structures tailored to end-use requirements
    Patent number: 5178942
    Abstract: An opaque, biaxially oriented polymeric film structure, produced by orienting the film to a degree which provides low light transmission and improved machinability.
    Type: Grant
    Filed: September 9, 1991
    Date of Patent: January 12, 1993
    Assignee: Mobil Oil Corporation
    Inventors: Jean-Pierre Frognet, Lajos E. Keller, Maurice Petitjean
  • High opacity film and method thereof
    Patent number: 5176954
    Abstract: A non-symmetrically layered, highly opaque, biaxially oriented polymer film with a core containing numerous microscopic voids and at least about 1% by weight of opacifying compounds; a first skin layer on one surface of the core containing up to about 12% by weight of inorganic particulate material; and a second skin layer on the other surface of the core.
    Type: Grant
    Filed: June 3, 1991
    Date of Patent: January 5, 1993
    Assignee: Mobil Oil Corporation
    Inventors: Lajos E. Keller, Larry G. Swan, John R. Wagner
  • Multi-layer high opacity film structures
    Patent number: 5091236
    Abstract: A multilayer opaque, biaxially oriented polymeric film structure.
    Type: Grant
    Filed: May 14, 1991
    Date of Patent: February 25, 1992
    Assignee: Mobil Oil Corporation
    Inventors: Lajos E. Keller, Jean-Pierre Frognet, Maurice Petitjean
  • Oriented polypropylene film structure
    Patent number: 5019447
    Abstract: An oriented polypropylene film structure comprises an oriented polypropylene base layer and a layer of a vinylidene chloride polymer on at least one surface of the base layer or on an intermediate layer, the vinylidene chloride polymer layer being substantially free of migratable emulsifier. A metal layer is provided directly on the vinylidene chloride polymer layer.
    Type: Grant
    Filed: December 12, 1989
    Date of Patent: May 28, 1991
    Assignee: Mobil Oil Corporation
    Inventor: Lajos E. Keller