Patents by Inventor Barry J. Heitner

Barry J. Heitner 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).

  • Direct sheet extrusion of solid surface sheet and profiled materials
    Patent number: 6544451
    Abstract: A process is disclosed for direct extrusion of an acrylic polymer highly filled with aluminum trihydroxide wherein a lubricant is introduced to permit the composition to be extruded at a temperature below about 200° C.
    Type: Grant
    Filed: June 26, 2000
    Date of Patent: April 8, 2003
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Barry J. Heitner, Clyde Spencer Hutchins
  • Preparation of acrylic polymer sheets using a ternary peroxide initiator system
    Patent number: 4605717
    Abstract: A process for producing acrylic polymers at a high rate which have high thermal stability, are free of defects and have a low level of unreacted monomer by polymerization of a methyl methacrylate syrup in the presence of a mixture of three peroxide initiators.
    Type: Grant
    Filed: June 21, 1985
    Date of Patent: August 12, 1986
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Barry J. Heitner
  • Process for preparing acrylic polymer sheets using a dual peroxide initiator system
    Patent number: 4588798
    Abstract: A process for producing acrylic polymers which have high thermal stability, are free of defects and have a low level of unreacted monomer. The process includes the polymerization at a high production rate of a methyl methacrylate syrup in the presence of a mixture of two peroxide initiators. The first initiator has a 5-minute half-life at temperatures between about 75.degree. C. to 100.degree. C. and emits a maximum of 1 mole of carbon dioxide per 2 moles of free radicals. The second initiator has a one minute half-life at temperatures of between about 105.degree. C. to about 125.degree. C. and emits a maximum of 1 mole of carbon dioxide per 1 mole of free radicals.
    Type: Grant
    Filed: February 1, 1985
    Date of Patent: May 13, 1986
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Barry J. Heitner