Patents by Inventor Walter B. Hahne

Walter B. Hahne 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).

  • Highway barrier with level internal ducts and construction method
    Patent number: 4641993
    Abstract: A roadway barrier section includes a duct formed of two intersecting frusto-conical portions placed end-to-end so that the central portion thereof. The duct is formed using two tapering mold plugs that are preferably frusto-conical. The mold plugs are placed in a concrete form so that the lower edge of the duct is a straight line that is generally parallel to the base of the barrier section.
    Type: Grant
    Filed: October 15, 1985
    Date of Patent: February 10, 1987
    Assignee: Associated Concrete Products
    Inventor: Walter B. Hahne
  • Utility vault cover seal
    Patent number: 4567697
    Abstract: In a rectangular utility vault cover a continuous flange on the underside of the cover presses against a sealing material contained in a channel mounted on the vault casing to form a non load bearing seal on the vault cavity. A raised ramp or cam located at each corner of the cover rides upon a raised track on the casing so that the projecting flange does not abrade the sealing material as the cover is slidably removed from the vault casing.
    Type: Grant
    Filed: December 8, 1983
    Date of Patent: February 4, 1986
    Inventor: Walter B. Hahne