Patents by Inventor Kevin Rodney Gerzevske

Kevin Rodney Gerzevske 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).

  • 2,9-dichloro-quinacridone as ?-quinacridone crystal phase inhibitor
    Patent number: 7419542
    Abstract: The invention is directed to a method or use of 2,9-dichloro-quinacridone as an alpha crystal phase inhibitor and optionally, 4,11-dichloroquinacridone during the beta-quinacridone or gamma-quinacridone crude pigment particle size reduction processes. The invention is also directed to solid solutions of quinacridone comprising about 98 to about 80 weight % gamma or beta-quinacridone, about 0.1 to about 10 weight % 2,9-dichloroquinacridone and about 0.1 to about 10 weight % 4,11-dichloroquinacridone.
    Type: Grant
    Filed: July 18, 2006
    Date of Patent: September 2, 2008
    Assignee: Ciba Specialty Chemicals Corporation
    Inventors: Yingxia He, Colin Dennis Campbell, Gordian Schilling, Rhonda Carter, Melissa Wagner, James Thomas Will, Kevin Rodney Gerzevske
  • Quinophenanthrine diones fluorescent whitening agents
    Patent number: 7294287
    Abstract: Tetrahydro- and dihydroquinophenanthrine dione fluorescent whitening agents and a process for their preparation are provided.
    Type: Grant
    Filed: September 1, 2006
    Date of Patent: November 13, 2007
    Assignee: Ciba Specialty Chemicals Corporation
    Inventors: Damien Thurber Cole, Kevin Rodney Gerzevske
  • Quinacridone pigment compositions comprising unsymmetrically substituted components
    Patent number: 7166158
    Abstract: The present invention relates to a novel quinacridone pigment compositions, a process using a mixed amine synthesis for the ultimate production of the compositions and to their use as colorants for pigmenting high molecular weight organic materials.
    Type: Grant
    Filed: July 13, 2004
    Date of Patent: January 23, 2007
    Assignee: Ciba Specialty Chemicals Corporation
    Inventors: Valentina K. Mitina, Kevin Rodney Gerzevske, Stéphane Biry, Christine Halik