Patents by Inventor Paulo Jorge Leitao

Paulo Jorge Leitao 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).

  • Patent number: 6722012
    Abstract: The invention deals with a technology for minting coins and medals. The technology is based on the utilization of metal blanks with similar diameters, one being very thin (hereafter named as the foil), joined together by mechanical means during the impartion of the surface details by the minting dies. The technology requires the design and manufacture of a special geometry in the edge of the thicker disk in order to make possible assembly of the metal blanks. The proposed technology is based on a multi-stage manufacturing process consisting of three cold metal forming operations (preforming, rimming and coining) and one intermediate annealing treatment. The first metal forming operation ensures the preforming of the thicker disk blank, hereafter named as the disk. The second metal forming stage is the rimming operation in which the preformed disk is bent along its diameter in order to generate a suitable profile for subsequent assembly with the foil.
    Type: Grant
    Filed: August 15, 2000
    Date of Patent: April 20, 2004
    Assignee: Imprensa Nacional Casa da Moeda, SA
    Inventors: Antonio Jose do Rosario Coelho Texeira, Paulo Antonio Martins, Paulo Jorge Leitao