Patents by Inventor Douglas A Steane

Douglas A Steane 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).

  • Adjustable see-saw apparatus
    Patent number: 5951406
    Abstract: The seesaw device is adjustable as to the lengths of the moment arms on the beam, of the two seats. Children can adjust the moment-arm length of their own seat in order to compensate for weight imbalances between them. A visible display scale informs of the child of the current moment arm setting.
    Type: Grant
    Filed: November 27, 1996
    Date of Patent: September 14, 1999
    Inventor: Douglas A Steane