Patents by Inventor Francois Gendreau

Francois Gendreau 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).

  • Process for the manufacture of combustible articles by pressing combustible paper discs by means of a flexible punch
    Patent number: 4826637
    Abstract: The invention relates to the field of combustible ammunition and relates chiefly to the manufacture of bottoms or covers for combustible cases.According to the invention, a combustible article is manufactured by pressing in a die 10 at least one sheet 21 of combustible paper containing nitrocellulose and having the shape of a disc, by virtue of a rigid movable punch 20 exerting a compressive force on a deformable flexible punch 22 arranged inside the said die 10 between the sheets 21 and the said movable punch 20. The flexible punch 22 is in the shape of a substantially cylindrical thick disc, consists of neoprene or a silicone resin and has a hardness of between 55 and 65 Shore at 20.degree. C. The pressing operation is accompanied by a thermoforming operation carried out at approximately 115.degree. C.The process is particularly suitable for the production of bottoms of combustible cases bearing studs or grooves on their side faces.
    Type: Grant
    Filed: March 10, 1987
    Date of Patent: May 2, 1989
    Assignee: Societe Nationale des Poudres et Explosifs
    Inventors: Michel Maures, Thierry Bonnabaud, Francois Gendreau