Zinc oxide stack overvoltage protection against temperature rise and thermal runaway
CA 1256937 A · Owner: Canadian General Electric Company Limited · Inventors: Chadwick, Philip
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Case 2858, OVERVOLTAGE PROTECTION SYSTEM ABSTRACT OF THE DISCLOSURE, In a system having a bus to which apparatus is connected that might be damaged by overvoltage and in which overvoltage protection is provided by a plurality of zinc oxide varistors connected in series in a column and the column connected between the bus and a reference source, means are provided to protect the varistors from damage caused by excessive temperature due to a large current flow through them. At least one temperature sensor is mounted on one of the varistors to sense when a safety tripping temperature is reached, and responsive to the temperature being reached a relay operates to reduce the voltage on the bus. …
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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 July 4, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 4, 2006.
- 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.