Patents by Inventor John J. Hopfield

John J. Hopfield 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: 5063417
    Abstract: An electronic shift register memory (20) at the molecular level is described. The memory elements are based on a chain of electron transfer molecules (22) and the information is shifted by photoinduced (26) electron transfer reactions. The device of the invention integrates designed electronic molecules onto a VLSI substrate (36), providing an example of a "molecular electronic device" which may be fabricated.
    Type: Grant
    Filed: July 18, 1988
    Date of Patent: November 5, 1991
    Assignee: California Institute of Technology
    Inventor: John J. Hopfield
  • Patent number: 4937872
    Abstract: Apparatus that solves the problem of pattern recognition in a temporal signal that is subject to distortions and time warp. The arrangement embodying the invention comprises a neural network, an input interconnection network, and a plurality of signal modification circuits. A plurality of input leads delivers a preselected characteristic stimulus to associated signal modification units, and in response to an applied stimulus, each signal modification unit develops a plurality of output signals that begins at the time of stimulus application, rises to a peak, and decays thereafter. The mean time delay of each output (time to reach the peak) is different for each of the modification unit output signals. The outputs of the signal modification units are applied to the input interconnection unit wherein connections are made in accordance with the sequences that are to be recognized.
    Type: Grant
    Filed: July 24, 1989
    Date of Patent: June 26, 1990
    Assignee: American Telephone and Telegraph Company
    Inventors: John J. Hopfield, David W. Tank
  • Patent number: 4719591
    Abstract: A network comprising analog amplifiers with a resistive interconnection matrix that connects each amplifier output to the input of all other amplifiers. The connections embodied in the matrix are achieved with conductances whose values are computed in accordance with the set of decomposition functions for which the solution is sought. In addition to the specified connectivity implemented. Further included is a second matrix that connects externally applied voltages to the amplifier inputs via resistors whose values are also computed in accordance with the set of decomposition functions for which the solution is sought. Still further and in accordance with another aspect of the invention, means are included for varying the amplifier gains from an initial low value to an ultimately high value in the process of arriving at a solution to an applied problem.
    Type: Grant
    Filed: November 7, 1985
    Date of Patent: January 12, 1988
    Assignees: American Telephone and Telegraph Company, AT&T Bell Labs., Calif. Institute of Technology
    Inventors: John J. Hopfield, David W. Tank
  • Patent number: 4660166
    Abstract: Amplifiers, optionally having complementary (positive and negative) outputs, are connected to a matrix of input and output conductors (where the output conductors are each a pair for the case of complementary amplifier outputs). Each connection is implemented with a resistors R.sub.ij =R.sub.ji connecting the output(s) of amplifiers j to the input of amplifiers i, and vice versa, where i and j are the ith and jth amplifiers not necessarily in sequence. The value of each resistor is selected for the nature of the decisional operation intended to satisfy the following circuit equation of motion ##EQU1## where V.sub.j =g(u.sub.j) the output of amplifier j due to an input u.sub.i, C.sub.i is the input capacitance of amplifier i, and R.sub.i is the equivalent of p.sub.i and R.sub.ij according to the equation ##EQU2## and R.sub.ij =R.sub.ji.
    Type: Grant
    Filed: January 22, 1985
    Date of Patent: April 21, 1987
    Assignees: Bell Telephone Laboratories, Incorporated, California Institute of Technology
    Inventor: John J. Hopfield