Patents by Inventor Nils H. Unden

Nils H. Unden 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).

  • Air flow direction indicator
    Patent number: 4437425
    Abstract: An airflow direction indicator in accordance with the invention is intended for sailboards, in which the front portion of the sail includes a tunnel which is slipped onto the mast and is rotatable relative thereto when varying the sheeting and curvature of the sail. In accordance with the invention, the indicator is supported by a fitting to be attached to the forward portion of the tunnel, this fitting carrying a mounting shaft forming an acute angle to the longitudinal direction of the tunnel and mast, and carrying a wind vane which is biased to return to a substantially vertical position adjacent the tunnel with the main longitudinal direction of the vane substantially parallel with the longitudinal direction of the fitting and tunnel, respectively, when the fitting is held in a vertical position, whereby the vane will indicate changes in the direction of the flow of air around the forward edge of the sail.
    Type: Grant
    Filed: December 8, 1981
    Date of Patent: March 20, 1984
    Inventor: Nils H. Unden
  • Wind direction indicator
    Patent number: D274797
    Type: Grant
    Filed: June 17, 1981
    Date of Patent: July 24, 1984
    Inventor: Nils H. Unden