Patents by Inventor Martha A. Welker

Martha A. Welker 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).

  • Foamed concrete composition and process
    Patent number: 6153005
    Abstract: The present invention describes fluorochemical foam stabilizers used in combination with surfactants to yield foams that are exceptionally stable in cementitious media. The stabilized foams that incorporate these fluorochemical agents are useful as novel ultra-lightweight foam aggregates in concrete compositions of tailorable density, strength, and other properties. Methods of making concrete compositions that include such foam aggregates are also described.
    Type: Grant
    Filed: April 16, 1999
    Date of Patent: November 28, 2000
    Assignee: Charles D. Welker
    Inventors: Charles D. Welker, Martha A. Welker, Mark F. Welker, Mark A. Justman, Randy S. Hendricksen