Including Electronic Element (e.g., Tube Or Semiconductor) Patents (Class 379/294)
  • Electronic micro-controller conversion module for step by step switching apparatus
    Patent number: 4633042
    Abstract: An improved step-by-step switch assembly includes an electronic controller conversion module. A programmed microprocessor responds to incoming pulse trains of widely variant make and break ratios and generates precisely timed and shaped pulses to operate vertical, rotary and release magnets of the switch assembly. Other features include increased loop sensitivity, selective digit absorption and automatic periodic contact wiping to clean all of the contacts of the assembly.
    Type: Grant
    Filed: July 26, 1984
    Date of Patent: December 30, 1986
    Assignee: Electrotel, Inc.
    Inventors: Gary C. Fields, Mark E. Stamos