Patents by Inventor Alfons Maderna

Alfons Maderna 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).

  • Underground swimming-bath
    Patent number: 3996630
    Abstract: An underground swimming-bath has its basin, ceiling and side walls constructed by means of a plurality of parts connected together and consisting of glassfiber reinforced plastic material. The parts are curved in two directions normal with respect to one another and a concrete layer is applied after assembly onto the outer side of the parts forming the swimming-bath.
    Type: Grant
    Filed: March 24, 1975
    Date of Patent: December 14, 1976
    Inventor: Alfons Maderna