Patents by Inventor Leslie A. Crawford

Leslie A. Crawford 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).

  • Moisture impervient barrier and method for making same
    Patent number: 4565468
    Abstract: A device for providing a moisture impervient barrier, comprises a flexible base sheet member having a layer of bentonite resting on its upper surface. A top sheet member is positioned over the bentonite and is secured to the base member by stitches extending therebetween. The stitches form either a quilting pattern or in the alternative, they can form elongated corrugated compartments filled with bentonite which will swell and break the top sheet member when exposed to water.
    Type: Grant
    Filed: October 24, 1983
    Date of Patent: January 21, 1986
    Inventor: Leslie A. Crawford