Patents by Inventor Charles Ulmann

Charles Ulmann 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).

  • Passages for one-way traversal especially for passenger traffic in stations
    Patent number: 3967411
    Abstract: The passage comprises two successive gates, maneouvrable in rotation in a single direction and conjugated to one another so that initially one is closed and the other open. These gates are sufficiently close to one another so that, on the opening of the first by a passenger arriving in the normal direction, the other closes thereby resisting the passage of a defrauder in the opposite direction.
    Type: Grant
    Filed: June 14, 1974
    Date of Patent: July 6, 1976
    Assignee: Etablissements Georges Klein
    Inventor: Charles Ulmann