Fail-safe acknowledging circuit
CA 1097787 A · Owner: Westinghouse Air Brake Company · Inventors: Darrow, John O.G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Case No. 6852), FAIL-SAFE ACKNOWLEDGING CIRCUIT ABSTRACT OF THE DISCLOSURE, A rail-safe solid-state acknowledging circuit for a cab signaling system requiring an acknowledgment after the reception of a more restrictive speed command signal employing a plurality of transistor latching circuits having a predetermined order of more restrictive significance. Each of the transistor latching circuits is coupled to one input of a separate two input OR gate while a separate a.c. transistor amplifier is coupled to the other input of each or the two input OR gates. The outputs of the OR gates along with an acknowledging switch controlled voltage are coupled to the inputs of a multiple input AND gate …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted March 17, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 17, 1998.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.