Patents by Inventor Per-Arne Lindholm

Per-Arne Lindholm 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).

  • Ventilation devices, in particular smoke and heat ventilation devices
    Patent number: 3994096
    Abstract: Ventilation device with a vent pivotally mounted in a frame and restrained against opening forces by a locking mechanism and also connected to the frame by a hydraulic brake or damper designed to gradually reduce the opening speed of the vent at least towards the end of the opening movement.
    Type: Grant
    Filed: April 21, 1975
    Date of Patent: November 30, 1976
    Assignee: Aktiebolaget Svenska Icopalfabriken
    Inventors: Kjell Ake Bertil Holmgren, Per-Arne Lindholm