×

Programmable interval timer with lock means

  • US 4,705,970 A
  • Filed: 02/04/1985
  • Issued: 11/10/1987
  • Est. Priority Date: 02/04/1985
  • Status: Expired due to Term
First Claim
Patent Images

1. A programmable interval timer for generating an error signal when a timing signal is received outside a predetermined time frame, comprising:

  • timer means having minimum and maximum timing intervals determining said predetermined time frame and responsive to first and second data input signals for setting said minimum and maximum timing intervals, respectively, and further responsive to first and second timing signals for generating a first output signal when the time interval between said first and second timing signals is less than said minimum timing interval and a second output signal when the time interval between said first and second timing signals is greater than said maximum timing interval;

    latch means for generating said error signal in response to one of said first and second output signals; and

    lock means connected to said timer means and responsive to a first receipt of one of said first and second timing signals for preventing said timer means from responding to one of said first and second data input signals.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×