Patents by Inventor Theodore Alan Fulton

Theodore Alan Fulton 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: 4096508
    Abstract: A supercurrent memory device comprises a plurality of extended Josephson junctions coupled to one another by having their weak-link layers in contact. Vortices corresponding to one logic state are generated in one pair of junctions, whereas vortices corresponding to a different logic state are generated in another pair of junctions in such a manner that the pairs have at least one junction in common and one junction not in common. Also described are various vortex sensors which may be used in conjunction with the memory device or other extended supercurrent devices.
    Type: Grant
    Filed: November 14, 1975
    Date of Patent: June 20, 1978
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Theodore Alan Fulton
  • Patent number: 4051393
    Abstract: A superconductive circuit includes a loop circuit having first and second parallel branches connected in parallel with an appropriately terminated fan-out line. Each branch includes a Josephson junction device and the loop circuit includes at least one resistor. A bias current is applied directly to the loop circuit so that each Josephson device is biased below its critical current I.sub.J. A control current is then coupled (directly or inductively) to the loop circuit so that in one branch the bias and control currents add and exceed I.sub.J. The Josephson device in that branch switches from V = 0 to V = 2.DELTA. causing substantially the entire bias current to flow through the other branch and thereby switching the other Josephson device to V = 2.DELTA.. Now substantially all the bias current is diverted to the fan-out line which can be used to control other similar circuits, i.e., to provide either the control or bias current for other circuits.
    Type: Grant
    Filed: December 16, 1976
    Date of Patent: September 27, 1977
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Theodore Alan Fulton
  • Patent number: 3999204
    Abstract: In an extended weak-link supercurrent device potential wells for vortices are created by the geometric configuration of one of the superconductive electrodes and are moved from one well to another by a magnetic field applied in the plane of the junction. In one embodiment the electrode has a plurality of spaced triangular notches along one edge. The notches are asymmetric in order to insure directionality of vortex flow. Other embodiments having a pig-tail or serpentine form are also described.
    Type: Grant
    Filed: December 3, 1975
    Date of Patent: December 21, 1976
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Theodore Alan Fulton
  • Patent number: 3936677
    Abstract: In an elongated weak-link supercurrent transmission line, the propagation of mobile flux vortices can be either enhanced or impeded by control means comprising a normal metal segment which interrupts either superconductor in the direction of vortex propagation and a control current source connected to the line at a point in operative relation to the normal metal segment. The control means either enhances or impedes the propagation of a vortex depending on the direction of the control current relative to that of the supercurrent associated with the vortex. The control means may also include a portion of the line in which its width is varied in order to change the velocity of the vortices.
    Type: Grant
    Filed: January 21, 1975
    Date of Patent: February 3, 1976
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Theodore Alan Fulton, John Kirtland Galt