Patents by Inventor John H. Platman

John H. Platman 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).

  • Mixed coupled azo pigments
    Patent number: 5246494
    Abstract: (1) A mixed coupled azo pigment prepared from:(A) 30% to 70% of two or more diazonium components, at least one derived from a monoaryl amine and(B) an organic coupling component, said pigment containing one or more COOH or SO H groups or esters, amides, alkali metal or alkali earth metal salts thereof or(2) A mixed coupled azo pigment prepared from:(A) 5% to 95% of two or more bis, tris or tetrakis diazonium components, at least one derived from a monoaryl amine and meeting certain specific critria and(B) an organic coupling component, said pigment comprising the same acid or salt groups of pigment (1).
    Type: Grant
    Filed: January 22, 1992
    Date of Patent: September 21, 1993
    Assignee: Engelhard Corporation
    Inventors: John H. Platman, James W. Nuss, deceased
  • Mixed coupled azo pigments
    Patent number: RE35654
    Abstract: (1) A mixed coupled azo pigment prepared from:(A) 30% to 70% of two or more diazonium components, at least one derived from a monoaryl amine and(B) an organic coupled component, said pigment containing one or more COOH or .?.SO H.!. .Iadd.SO.sub.3 H .Iaddend.groups or esters, amides, alkali metal or alkali earth metal salts thereof or(2) A mixed coupled azo pigment prepared from:(A) 5% to 95% of two or more bis, tris or tetrakis diazonium components, at least one derived from a monoaryl amine and meeting certain specific critria and(B) an organic coupling component, said pigment comprising the same acid or salt groups of pigment (1).
    Type: Grant
    Filed: September 8, 1995
    Date of Patent: November 11, 1997
    Assignee: Engelhard Corporation
    Inventors: John H. Platman, James W. Nuss, deceased