Fail-safe "or" gate
CA 1097751 A · Owner: Westinghouse Air Brake Company · Inventors: Harrison, John R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Case No. 6906), FAIL-SAFE " OR" GATE, ABSTRACT OF THE DISCLOSURE A fail-safe "OR" logic gate circuit which includes at least a first and a second level detector each of which has a voltage breakdown device and an oscillating circuit a separate, resonant tank circuit each of which is tuned to substantially the same frequency and being loosely coupled between each other an amplifying circuit coupled to the output of each oscillating circuit, and a regulating-rectifying circuit coupled to the output of the amplifying circuit and producing a d.c. output signal when a d.c. input signal causes either or both of the voltage breakdown devices to break down and to exhibit a low impedance for causing …
Read the whole patent
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.