Patents by Inventor David N. Dickson

David N. Dickson 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).

  • Acid-dye resistant polyamide products and process for preparation
    Patent number: 5562871
    Abstract: A process for preparing melt spun polymeric fiber made from polymerized amide monomers includes the steps of pigmenting the polymer, incorporating within the polymer sufficient SO.sub.3 H groups or salts thereof to give the polymer a sulphur content of between about 10 and about 160 equivalents per 10.sup.6 grams polymer and thereafter chemically blocking with a chemical blocking agent a portion of amino end groups present in the sulphonated polymer.
    Type: Grant
    Filed: May 22, 1995
    Date of Patent: October 8, 1996
    Assignee: BASF Corporation
    Inventors: Matthew B. Hoyt, Andrew M. Coons, III, David N. Dickson
  • Carpet made from fibers spun from acid dye resistant pigmented polymer
    Patent number: 5560973
    Abstract: A process for preparing melt spun polymeric fiber made from polymerized amide monomers includes the steps of pigmenting the polymer, incorporating within the polymer sufficient SO.sub.3 H groups or salts thereof to give the polymer a sulphur content of between about 10 and about 160 equivalents per 10.sup.6 grams polymer and thereafter chemically blocking with a chemical blocking agent a portion of amino end groups present in the sulphonated polymer.
    Type: Grant
    Filed: May 22, 1995
    Date of Patent: October 1, 1996
    Assignee: BASF Corporation
    Inventors: Matthew B. Hoyt, Andrew M. Coons, III, David N. Dickson
  • Acid dye resistant pigmented polymer
    Patent number: 5548037
    Abstract: A process for preparing melt spun polymeric fiber made from polymerized amide monomers includes the steps of pigmenting the polymer, incorporating within the polymer sufficient SO.sub.3 H groups or salts thereof to give the polymer a sulphur content of between about 10 and about 160 equivalents per 10.sup.6 grams polymer and thereafter chemically blocking with a chemical blocking agent a portion of amino end groups present in the sulphonated polymer.
    Type: Grant
    Filed: May 22, 1995
    Date of Patent: August 20, 1996
    Assignee: BASF Corporation
    Inventors: Matthew B. Hoyt, Andrew M. Coons, III, David N. Dickson
  • Process for forming melt-spun carpet fiber
    Patent number: 5545363
    Abstract: A process for preparing melt spun polymeric fiber made from polymerized amide monomers includes the steps of pigmenting the polymer, incorporating within the polymer sufficient SO.sub.3 H groups or salts thereof to give the polymer a sulphur content of between about 10 and about 160 equivalents per 10.sup.6 grams polymer and thereafter chemically blocking with a chemical blocking agent a portion of amino end groups present in the sulphonated polymer.
    Type: Grant
    Filed: April 15, 1994
    Date of Patent: August 13, 1996
    Assignee: BASF Corporation
    Inventors: Matthew B. Hoyt, Andrew M. Coons, III, David N. Dickson
  • Acid-dye resistant polyamide products and process for preparation
    Patent number: 5340886
    Abstract: A process for preparing melt spun polymeric fiber made from polymerized amide monomers includes the steps of pigmenting the polymer, incorporating within the polymer sufficient SO.sub.3 H groups or salts thereof to give the polymer a sulphur content of between about 10 and about 160 equivalents per 10.sup.6 grams polymer and thereafter chemically blocking with a chemical blocking agent a portion of amino end groups present in the sulphonated polymer.
    Type: Grant
    Filed: June 2, 1993
    Date of Patent: August 23, 1994
    Assignee: BASF Corporation
    Inventors: Matthew B. Hoyt, Andrew M. Coons, III, David N. Dickson