Patents by Inventor Paul N. Richardson

Paul N. Richardson 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 fabrication
    Patent number: 5130076
    Abstract: Melt fabrication, with precompounding, of a plurality of thermoplastic resins, is provided by use of a screw having a dispersion section in such machines as injection molding machines. The minor resin component can be an elastomer, which toughens the resin's major component. This effect is improved by increasing back pressure on the screw used in the injection molding machine, to extend the screw rotation and thus shear time accomplished by the dispersion section.
    Type: Grant
    Filed: February 14, 1991
    Date of Patent: July 14, 1992
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Philip S. Blatz, Paul N. Richardson, Pallatheri M. Subramanian
  • Polyoxymethylene/polyurethane compositions containing polycarbodiimide
    Patent number: 4845161
    Abstract: Polyoxymethylene/thermoplastic polyurethane compositions having 5-40 weight percent polyurethane are modified by incorporating therein 0.05-1.0 weight percent of a polycarbodiimide (or a mixture of polycarbodiimides) having a molecular weight of about 1000 and containing units of the formula ##STR1## where n has an average value of about 3, to improve resistance to discoloration and decomposition.
    Type: Grant
    Filed: November 23, 1987
    Date of Patent: July 4, 1989
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Paul N. Richardson
  • Toughened polyamide flame retarded with octabromodiphenyl ether
    Patent number: 4376182
    Abstract: Toughened flame retardant polyamide molding blend containing a selected octabromodiphenyl ether and a polymeric toughening agent.
    Type: Grant
    Filed: April 28, 1982
    Date of Patent: March 8, 1983
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Paul N. Richardson
  • Flame-retardant polyamide compositions
    Patent number: 4373049
    Abstract: A flame-retardant polyamide composition is described which is non-brittle. The composition is comprised of a nylon 66 or nylon 66/6, a brominated polystyrene, antimony oxide and a selected non-ionic surfactant.
    Type: Grant
    Filed: November 5, 1981
    Date of Patent: February 8, 1983
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Paul N. Richardson
  • Polyamide resins
    Patent number: 4283502
    Abstract: A melt compounded blend of a nylon resin and a small amount of a finely divided adduct which contains a requisite amount of anhydride functionality. The adduct polymer is found to provide nucleating effects to the resultant blend.
    Type: Grant
    Filed: April 7, 1980
    Date of Patent: August 11, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Paul N. Richardson
  • Polyamide nucleated with zinc phenyl phosphinate or zinc phenyl phosphonate
    Patent number: 4200707
    Abstract: A blend of a condensation polyamide and zinc phenyl phosphinate and/or zinc phenyl phosphonate nucleating agent has been found to result in resins having good strength.
    Type: Grant
    Filed: August 11, 1978
    Date of Patent: April 29, 1980
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Paul N. Richardson