Patents by Inventor Andrew R. B. Ferguson

Andrew R. B. Ferguson 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).

  • Contraceptive device
    Patent number: 5050619
    Abstract: A male contraceptive device has two sheaths (1, 4) which are relatively slidable for cleaning and assembly but keep stationary during use. Sheath (4) has a air hole (6) and the arrangement is such that air is allowed to and from the inner sheath via the air hole and passages between the sheaths. Air flow is partially restricted so that partial collapse of the sheaths occurs on withdrawal.
    Type: Grant
    Filed: December 22, 1989
    Date of Patent: September 24, 1991
    Inventor: Andrew R. B. Ferguson