Patents by Inventor Johannes Johannson

Johannes Johannson 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).

  • Method and apparatus for casting tubular bodies
    Patent number: 4365781
    Abstract: A collapsible inner form for making tubular concrete products has upper and lower sections with rigid casting faces, and flexible side sections which buckle inwardly when the internal form is collapsed. Jacks are used to push wheels in the upper and lower sections outwardly against the cast product, forcing the sections to their collapsed positions. The inner form is movable on the wheels for removal of the inner form from the solidified cast product.
    Type: Grant
    Filed: April 2, 1981
    Date of Patent: December 28, 1982
    Assignee: Lagoven, S.A.
    Inventor: Johannes Johannson