Patents by Inventor John E. Darnell

John E. Darnell 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).

  • Controlled descent device
    Patent number: 5056619
    Abstract: A controlled descent device is disclosed, including an elongate guide assembly that has an upper portion, a lower portion and a generally helical track that extends from the upper portion to the lower portion. A carriage includes a primary bearing that is engaged with and movable within the track. A harness is secured to the carriage and the carriage is descendible along the track to lower a person fastened in the harness from the upper portion of the guide assembly to the lower portion thereof.
    Type: Grant
    Filed: December 27, 1989
    Date of Patent: October 15, 1991
    Inventors: George Darnell, John E. Darnell