Patents by Inventor Frank DeStefano, Jr.

Frank DeStefano, Jr. 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).

  • Internal paper sizing agent
    Patent number: 6368457
    Abstract: The present invention comprises an alum/rosin composition for internally sizing paper which is useful in any papermaking furnish with moderate to high hardness, as well as methods for preparing such alum/rosin composition. Employing the invention alum/rosin composition of an alum to rosin ratio of 1-3:1, respectively, and of a mean particle diameter of no greater than 10 microns, results in sizing of improved efficiency. In the preparation of the invention sizing composition, the pre-reacting of either neat or solutions of alum and rosin before introducing the mixture into the papermaking furnish, allows the alum to be free to react with the rosin size without any competition from other cations in the furnish.
    Type: Grant
    Filed: June 11, 1999
    Date of Patent: April 9, 2002
    Assignee: Westvaco Corporation
    Inventors: Bernard A. Kraus, Frank DeStefano, Jr., Gerald Katz