Patents Assigned to Lawson Mardon Thermaplate Corporation
  • Patent number: 6169143
    Abstract: Polyester composition with improved impact properties, improved oxygen permeability and improved dimensional shrinkage during heating. Impact modifiers are dissolved into a molten polyester to form a eutectic alloy. On slow cooling, the eutectic alloy of the invention freezes to form a mixture of particles of the impact modifier embedded in a matrix of the polyester. By controlling the solidification of the melt, the size and distribution of the precipitates from the melt can be controlled, which allows control of the mechanical properties. The precipitation can also be controlled either by homogenous nucleation or by heterogeneous nucleation through the addition of a nucleating agent or the introduction of a suitable surface for nucleation. The invention also provides a process of manufacturing the above polyester, an article comprising this polyester and a process for making this article.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: January 2, 2001
    Assignee: Lawson Mardon Thermaplate Corporation
    Inventors: Edward J. Dalgewicz, III, John Bond, Richard Freundlich
  • Patent number: 6077904
    Abstract: Polyester composition with improved impact properties, improved oxygen permeability and improved dimensional shrinkage during heating. Impact modifiers are dissolved into a molten polyester to form a eutectic alloy. On slow cooling, the eutectic alloy of the invention freezes to form a mixture of particles of the impact modifier embedded in a matrix of the polyester. By controlling the solidification of the melt, the size and distribution of the precipitates from the melt can be controlled, which allows control of the mechanical properties. The precipitation can also be controlled either by homogenous nucleation or by heterogeneous nucleation through the addition of a nucleating agent or the introduction of a suitable surface for nucleation. The invention also provides a process of manufacturing the above polyester, an article comprising this polyester and a process for making this article.
    Type: Grant
    Filed: July 17, 1992
    Date of Patent: June 20, 2000
    Assignee: Lawson Mardon Thermaplate Corporation
    Inventors: Edward J. Dalgewicz, III, John Bond, Richard Freundlich
  • Patent number: 6012628
    Abstract: A protective box for a food tray. The food tray has a base, a generally upright, contiguous wall attached to the base, and a circumferential flange attached to an upper edge of the wall. The protective box typically has three or more, generally upright walls, and a device for holding the food tray within the box so that the flange of the food tray is separated from at least two of the upright walls of the protective box.
    Type: Grant
    Filed: May 13, 1997
    Date of Patent: January 11, 2000
    Assignee: Lawson Mardon Thermaplate Corporation
    Inventors: Mahmood A. Shaikh, Andreas Christel