Patents by Inventor Terrence R. Chamberlain

Terrence R. Chamberlain 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).

  • Process for the preparation of beta-phase quinacridone
    Patent number: 6494949
    Abstract: A process for producing beta-phase quinacridone by (a) reacting 2,5-dianilino-terephthalic acid with polyphosphoric acid in the presence of 2,5-dianisidino-terephthalic acid at a reaction temperature of at least 85° C.; (b) diluting the reaction mixture with water; (c) drowning the diluted mixture in a water-miscible alkanol; (d) heating the slurry at a temperature of from 100 to 130° C. at a pressure of 20 to 50 psi; and (e) recovering the beta-phase quinacridone.
    Type: Grant
    Filed: January 5, 2001
    Date of Patent: December 17, 2002
    Assignee: Sun Chemical Corporation
    Inventors: Edward Sung, Kathleen M. Kozak, George H. Robertson, Terrence R. Chamberlain
  • Preparation of heat stable pigment violet 23
    Patent number: 6476222
    Abstract: A process for improving the heat stability of Pigment Violet 23 by conditioning crude Pigment Violet 23 in the presence of about 1 to 10 wt. % of Pigment Violet 23 by-products (1), (2) and (3).
    Type: Grant
    Filed: January 5, 2001
    Date of Patent: November 5, 2002
    Assignee: Sun Chemical Corporation
    Inventors: Norman W. Smith, Terrence R. Chamberlain, Barbara N. Berg, George McLaren, Russell J. Schwartz
  • Preparation of heat stable pigment violet 23
    Publication number: 20020091257
    Abstract: A process for improving the heat stability of Pigment Violet 23 by conditioning crude Pigment Violet 23 in the presence of about 1 to 10 wt. % of Pigment Violet 23 by-products (1), (2) and (3).
    Type: Application
    Filed: January 5, 2001
    Publication date: July 11, 2002
    Inventors: Norman W. Smith, Terrence R. Chamberlain, Barbara N. Berg, George McLaren, Russell J. Schwartz
  • Process for the preparation of beta-phase quinacridone
    Publication number: 20020088377
    Abstract: A process for producing beta-phase quinacridone by (a) reacting 2,5-dianilino-terephthalic acid with polyphosphoric acid in the presence of 2,5-dianisidino-terephthalic acid at a reaction temperature of at least 85° C.; (b) diluting the reaction mixture with water; (c) drowning the diluted mixture in a water-miscible alkanol; (d) heating the slurry at a temperature of from 100 to 130° C. at a pressure of 20 to 50 psi; and (e) recovering the beta-phase quinacridone.
    Type: Application
    Filed: January 5, 2001
    Publication date: July 11, 2002
    Inventors: Edward Sung, Kathleen M. Kozak, George H. Robertson, Terrence R. Chamberlain
  • Syntheses for preparing 1,4-diketopyrrolo [3,4-c]pyrroles
    Patent number: 6388093
    Abstract: A synthesis for preparing asymmetrical 1,4-diketopyrrolo[3,4-c]pyrroles involving: (a) reacting a &bgr;-ketoamide with a strong base; (b) halogenating the same or a different &bgr;-ketoamide; (c) reacting the reaction products of step (a) and (b) to form a succinamide; and (d) heating the succinamide in the presence of a Lewis Acid. Symmetrical 1,4-diketopyrrolo [3,4-c]pyrroles are synthesized by oxidatively dimerizing the reaction product of step (b) to form a succinamide; and heating the succinamide in the presence of a Lewis Acid.
    Type: Grant
    Filed: January 5, 2001
    Date of Patent: May 14, 2002
    Assignee: Sun Chemical Corporation
    Inventors: Terrence R. Chamberlain, Craig Thornley
  • Process for the manufacture of 1,8-naphthalimide
    Patent number: 6372910
    Abstract: A process for preparing 1,8-naphthalimide by reacting 1,8-naphthalic anhydride with ammonia in an aqueous solution under atmospheric pressure at 60 to 100° C.
    Type: Grant
    Filed: February 28, 2000
    Date of Patent: April 16, 2002
    Assignee: Sun Chemical Corporation
    Inventors: Terrence R. Chamberlain, Donald T. DeRussy