Patents by Inventor Gerd W. Passing

Gerd W. Passing 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).

  • High selectivity colloidal silica slurry
    Patent number: 6964600
    Abstract: Provided is a novel high selectivity aqueous slurry composition method of utilizing same. The composition includes non-modified silica based abrasive particles in an amount of about 5 to about 50 weight percent, and an organic compound in an amount of about 0.001 to about 2.0 weight percent in an aqueous solution, wherein the silicon oxide to silicon nitride selectivity ratio ranges from about 50 to about 700.
    Type: Grant
    Filed: November 21, 2003
    Date of Patent: November 15, 2005
    Assignee: Praxair Technology, Inc.
    Inventors: Irina Belov, Lothar Puppe, Gerd W. Passing, Thomas J. Hunt