Patents by Inventor Frederick J. Barnes

Frederick J. Barnes 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).

  • Patent number: 4126297
    Abstract: A lever for lifting manhole covers comprising a foot, a key adapted to engage a keyhole in a manhole cover, said key being pivotally mounted on one end of the foot, a first roller mounted on the foot inwardly of the other end thereof for rotation about an axis transverse to the longitudinal axis of the foot, a second roller mounted on the foot adjacent the other end thereof for rotation about an axis parallel to the axis of rotation of the first roller, the rollers being located relative to each other so that they function as a rolling fulcrum, the first roller functioning initially as a pivot for lifting the manhole cover and the second roller functioning as a trolley to enable the lifted cover to be transported and an operating lever one end of which is connected to the foot adjacent said one end with the lever projecting at an angle therefrom.
    Type: Grant
    Filed: November 17, 1977
    Date of Patent: November 21, 1978
    Inventor: Frederick J. Barnes