Method for implementing selectable protective relay functions
CA 2106357 A1 · Owner: Beckwith Electric Company · Inventors: Yalla, Murty V. V. S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a relay protective system a method of providing volts per Hz loss of field, ground differ-, ential, phase distance and over voltage protective relay functions. In addition the inventive method, provides an improved method to selectively block any of the above functions in response to input contacts and selectively activate output contacts in response to operation of the above functions using programmable inputs and outputs.
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
- Filed September 16, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 16, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 16, 2015.
- 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.