Patents by Inventor Paul Malzahn

Paul Malzahn 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).

  • Protective annular construction and method of manufacture
    Patent number: 4683691
    Abstract: A protective annular construction for protecting surface or subsurface facilities against shock. In one embodiment, the invention utilizes concentric slip formed concrete cylinders, at least partially embedded in the soil as a sacrificial construction to dissipate the shock. A method of forming the construction by slip casting concrete shapes followed by, or simultaneously excavating the soil beneath the void between the concrete shapes to allow the cylinders to descend into the soil.
    Type: Grant
    Filed: February 24, 1986
    Date of Patent: August 4, 1987
    Inventor: Paul Malzahn