Patents Represented by Attorney M. L. Winkelman

Find this attorney in the Justia Lawyer Directory

  • Method for the preparation of styrene polymer foam and foam prepared thereby
    Patent number: 4636527
    Abstract: Styrene polymer foam is prepared using a mixed blowing agent of carbon dioxide plus ethyl chloride and optionally a fluorocarbon to provide a foam having primary cells and secondary cells formed in the struts and walls.
    Type: Grant
    Filed: March 31, 1986
    Date of Patent: January 13, 1987
    Assignee: The Dow Chemical Company
    Inventors: Kyung W. Suh, John M. Kennedy
  • Method for obtaining low densities with particulate expandable polystyrene
    Patent number: 4579701
    Abstract: Low density expanded polystyrene is obtained by extended exposure of particles to atmospheric steam and aging the particles in air. Particles have wrinkled cell walls.
    Type: Grant
    Filed: September 24, 1984
    Date of Patent: April 1, 1986
    Assignee: The Dow Chemical Company
    Inventors: Chung P. Park, James T. Grimes
  • Uniform minimization of plastic foam cell size
    Patent number: 4579872
    Abstract: Expandable beads and the like of thermoplastic organic polymer material, advantageously lightly-crosslinked in preparation, which are imbibed with halocarbon and/or light hydrocarbon (including mixed) blowing agents are advantageously tempered to provide excellent quality, uniformly fine-celled expanded cellular products therefrom by a quick quench from imbibition temperature to below 10 or so .degree. C. within one minute.
    Type: Grant
    Filed: May 6, 1985
    Date of Patent: April 1, 1986
    Assignee: The Dow Chemical Company
    Inventor: David R. Johnson
  • Expandable synthetic resinous thermoplastic particles, method for the preparation thereof and the application therefor
    Patent number: 4569949
    Abstract: Expandable styrene acrylonitrile polymer particles are provided which give good resiliency over an extended period of time.
    Type: Grant
    Filed: June 17, 1985
    Date of Patent: February 11, 1986
    Assignee: The Dow Chemical Company
    Inventor: John W. Brenner