Patents by Inventor Donald R. Rutledge

Donald R. Rutledge 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: 4503676
    Abstract: Apparatus for directly converting thermal energy into rotational movement. A long shaft relative to its cross-section and made of an elastic material with a high thermal coefficient of expansion is equipped with a plurality of journals at prescribed points along its axial length. A corresponding number of fixedly mounted circular bearings receive the journals. The bearings are arranged to constrain the shaft into an elastic arc. Thermal energy is applied to all or a substantial part of the concave surface of the arced shaft. Means may be employed to force cool all or a portion of the convex portion of the arced shaft. As a result of this arrangement, the shaft elastically rotates about its axis within the bearings. Structure is disclosed for coupling the rotational movement of the shaft to a utilization device.
    Type: Grant
    Filed: December 30, 1983
    Date of Patent: March 12, 1985
    Assignee: AT&T Bell Laboratories
    Inventor: Donald R. Rutledge
  • Patent number: 4372535
    Abstract: A capstan winch for pulling cable through conduit includes means for measuring the torque applied to the capstan and a take-up reel. The torque measuring means comprises an inner drum connected by a tension spring to a concentric outer drum. A patterned disc on the inner drum is visible through a window in the outer drum. The pattern indicates the relative position of the inner and outer drums, which is correlated to the applied torque.
    Type: Grant
    Filed: August 25, 1980
    Date of Patent: February 8, 1983
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: David W. Gibson, Albert L. Hale, Daniel L. Pope, Donald R. Rutledge, Kirk P. Wells