Patents by Inventor John C. Helfrick

John C. Helfrick 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).

  • Sizing composition
    Patent number: 9127407
    Abstract: A sizing composition includes from about 3 kg/ton to about 15 kg/ton of calcium propionate, an additive, and a balance of water. The additive is selected from the group consisting of starch, an optical brightener, a biocide, a defoamer, a surface size agent, a wet strength additive, and combinations thereof. The sizing composition has a pH ranging from 7 to 8.
    Type: Grant
    Filed: April 15, 2013
    Date of Patent: September 8, 2015
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Steven L. Webb, John L. Stoffel, John C. Helfrick, Silke Courtenay