Compressor motor protector
CA 1065448 A · Owner: Lennox Industries Inc. · Inventors: Pfarrer, David M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved circuit for protecting the motor of a refrigerant compressor includes first and second magnetic contactors which are connected between a source of threephase AC voltage and the compressor motor. The contactors are normally operated simultaneously so that each of the contactors is periodically opened and closed in accordance with the demands for operation of the compressor motor. If one of the contactors falls in the closed position the other, contactor will open to protect the compressor motor. This result is accomplished through use of a high impedance relay coil provided in parallel with contactor switches in the common line to the compressor motor and a normally closed switch …
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 October 30, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 30, 1996.
- 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.