Patents Examined by James B. Scott
  • Sequence control circuit
    Patent number: 4015138
    Abstract: A sequence control circuit makes use of a stepping switch to progress the steps of an automatically controlled apparatus. The switch steps as limit switches operate to conclude each stage of the sequence and proving switches, in series with the limit switches, operate to complete sub-circuits and prove the state of the circuit as satisfactory.
    Type: Grant
    Filed: October 18, 1974
    Date of Patent: March 29, 1977
    Assignee: Coal Industry (Patents) Limited
    Inventors: John Frederick Collett Andrews, Edward Stanislaw Budzinski, David Henry Pearson