Patents Represented by Attorney Robert H. Fraser
  • Patent number: 3949394
    Abstract: A read amplifier generates pulses in response to the transitions of a phase encoded signal and selectively gates the pulses to an output and to a retriggerable one shot multivibrator under the control of inhibit pulses produced by the multivibrator. During a preamble of the data signal in which a known sequence of zeros is produced, a decade counter prevents generation of pulses in response to the polarity return transitions between the zeros and prevents the inhibit pulses from being applied to gate the pulses produced by the data signal until a predetermined number of zero pulses has been counted. During the preamble the inhibit pulses at the output of the multivibrator are averaged and compared with a reference so as to adjust the duty cycle of the multivibrator to produce inhibit pulses which are 70 percent of the duration of the bit intervals of the data signal.
    Type: Grant
    Filed: April 8, 1974
    Date of Patent: April 6, 1976
    Assignee: C. J. Kennedy Company
    Inventor: Charles J. Kennedy
  • Patent number: D244354
    Type: Grant
    Filed: November 3, 1975
    Date of Patent: May 17, 1977
    Inventors: James R. Green, Adolf Wegmann
  • Patent number: D246894
    Type: Grant
    Filed: May 12, 1975
    Date of Patent: January 10, 1978
    Inventor: James R. Green
  • Patent number: D253299
    Type: Grant
    Filed: April 28, 1978
    Date of Patent: October 30, 1979
    Inventor: Stephen W. Hess
  • Patent number: D255873
    Type: Grant
    Filed: May 17, 1978
    Date of Patent: July 15, 1980
    Inventor: Al W. Hustrei
  • Patent number: D256260
    Type: Grant
    Filed: February 13, 1978
    Date of Patent: August 5, 1980
    Inventor: Fred Lay, Jr.
  • Patent number: D257874
    Type: Grant
    Filed: September 13, 1978
    Date of Patent: January 13, 1981
    Assignee: R. J. Louis Enterprises, Inc.
    Inventors: Richard D. Sheehan, R. J. Louis