Patents by Inventor Lennart Franz

Lennart Franz 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).

  • Valve assembly for packing fluid under pressure and packing provided with such assembly
    Patent number: 5018552
    Abstract: The valve assembly for non-returnable packing comprises a valve housing including a main valve and an auxiliary valve the latter being initially kept in opened position through a resilient locking device which is unlocked, at the end of a first filling through a displacement of the main valve beyond its position of normal opening under the action of a long travel filling tap. The auxiliary valve is then forced to rest on its seat by means of a spring with low calibration. Any depression caused by tapping would provoke the opening of the auxiliary valve, while any overpressure resulting from filling would hit the auxiliary valve in a closed position.
    Type: Grant
    Filed: May 29, 1990
    Date of Patent: May 28, 1991
    Assignee: L'Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
    Inventors: Jean-Marie Politi, Lennart Franz