Patents by Inventor Hans Naf

Hans Naf 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 and apparatus for manufacturing molded parts from granulated plastic materials
    Patent number: 4191726
    Abstract: A process of manufacturing molded parts using a mold with relatively movable parts enclosing a mold cavity which is fed with plasticizable material, comprises directing grains of the plasticizable material into a vertically elongated vestibule having a lower end connected to the feed of the mold cavity and directing hot gases into the lower end of the vestibule and upwardly through the plasticizable material therein to make the material weldable and, thereafter, directing the weldable material into the cavity under pressure. The device for carrying out the process includes a feed conduit which is connected into the cavity which is disposed below a vertically elongated vestibule which has a closed top and a bottom opening into the conduit.
    Type: Grant
    Filed: March 17, 1978
    Date of Patent: March 4, 1980
    Assignee: Gebrueder Buehler AG
    Inventors: Bruno Stillhard, Hans Naf
  • Process and apparatus for manufacturing molded parts from granulated plastic materials
    Patent number: 4158540
    Abstract: A process of manufacturing molded parts using a mold with relatively movable parts enclosing a mold cavity which is fed with plasticizable material, comprises directing grains of the plasticizable material into a vertically elongated vestibule having a lower end connected to the feed of the mold cavity and directing hot gases into the lower end of the vestibule and upwardly through the plasticizable material therein to make the material weldable and, thereafter, directing the weldable material into the cavity under pressure. The device for carrying out the process includes a feed conduit which is connected into the cavity which is disposed below a vertically elongated vestibule which has a closed top and a bottom opening into the conduit.
    Type: Grant
    Filed: June 24, 1977
    Date of Patent: June 19, 1979
    Assignee: Gebruder Buhler AG
    Inventors: Bruno Stillhard, Hans Naf