Fail-safe electronic polarized relay
CA 1077578 A · Owner: Darrow, John O. G. · 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, 6825), FAIL-SAFE ELECTRONIC POLARIZED RELAY ABSTRACT OF THE DISCLOSURE, A fail-safe symmetrical solid-state polarized relay circuit having a positive and a negative level detector coupled to a source of periodic input signals. A pair of amplifiers for amplifying the a.c. oscillations produced by the level detectors. A plurality of rectifiers for rectifying the a.c. oscillations and for alternately producing a d.c. output voltage on a pair of output terminals in accordance with the positive and negative excursions of the periodic input signals.
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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 May 13, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 13, 1997.
- 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.