Patents Assigned to Charles J. Trojahn
  • Impervious wall structure
    Patent number: 3935688
    Abstract: An impervious wall structure including at least two panels welded along adjoining vertical edges. Stress relief structure is on the panels to facilitate welding of the panels without undesirable deformation thereof. Finally, support structure is provided to assist in reinforcing the panels thereby providing a continuous impervious wall structure adaptable for use over large areas.
    Type: Grant
    Filed: December 3, 1973
    Date of Patent: February 3, 1976
    Assignees: Charles J. Trojahn, Friedrich Metal Products Co., Frank Brunckhorst Co.
    Inventors: Charles Joseph Trojahn, Nikolaus Friedrich