Patents by Inventor John D. Langdon

John D. Langdon 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: 4807888
    Abstract: The invention relates to an automatic target rising device intended primarily for use in a form of shooting competition known as "International Metallic Silhouette". This device includes a target mounted platform with guide slots attached to its lower surface. These slots are engaged by retaining bars which are mounted on pedestals with a sloping rear edge. This allows the target to fall by a combination of pivoting on and sliding over the retaining bars at the top rear edge of the pedestals. The target is reset by means of a rotatably mounted lever which transfers the force and movement of a linear actuator to the lower surface of a fallen target platform immediately behind the guide slots, enabling the target to be raised by a combination of sliding over and pivoting on the retaining bars and pivoting on the end of the lever which returns to its original position after resetting the target.
    Type: Grant
    Filed: August 24, 1987
    Date of Patent: February 28, 1989
    Inventors: Victor S. Pidde, John D. Langdon
  • Patent number: 4757967
    Abstract: An electrical box support for supporting an electrical box or other like device in a studded wall. The box support comprises a horizontal strut having a centrally located outwardly opening horizontally extending V-shape channel and a pair of legs formed at each end thereof. The purpose of the V-shape channel is to facilitate horizontal positioning or alignment of such boxes, to facilitate fastening, and also to strengthen the strut. Separating each leg of a leg pair is a cut-out which allows each of the legs to flex and bend independent of the other. To rigidify further and strengthen the box support, the invention further provides a pair of flanges or ribs formed along the lateral edges of the horizontal strut.
    Type: Grant
    Filed: September 2, 1986
    Date of Patent: July 19, 1988
    Assignee: Erico International Corporation
    Inventors: Martin F. Delmore, John D. Langdon