Patents by Inventor John Carbert

John Carbert 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 production of free flowing dust-free pigments
    Patent number: 4285994
    Abstract: This invetion relates to novel pigement compositions and processes of making the same. The pigments of the present invention are free-flowing and a process for their production comprises a process for the production of a free-flowing pigment composition comprising tumbling together a finely divided wax composition as herein defined with a powdered pigment for a time sufficient for substantialy all of the pigment to be coated onto or to be absorbed by the wax. Specifically, a pigment in accordance with the invention comprises a free-flowing nucleated pigment composition comprising a substantially spherical particulate spray-chilled wax composition (as herein defined) having coated thereon and partially absorbed thereinto a pigment in powdered form, the said pigment being present to the extent of 50% by weight or more.
    Type: Grant
    Filed: July 3, 1980
    Date of Patent: August 25, 1981
    Assignee: Johnson, Matthey & Co., Limited
    Inventors: Roy W. J. Pearce, John Carbert, John P. K. MacDonald