Automatic flashover protection for locomotive traction motors
CA 2071920 C · Owner: Brown, Herbert Joseph · Inventors: Laukaitis, Joseph Andrew; Balch, Edgar Thomas; Brown, Herbert Joseph
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Flashover protection is provided for a locomotive propulsion system including a plurality of d-c traction motors (15 16), each having a commutator (15A) subject to flashovers. A flashover detector (32) is provided for producing a fault signal in case a flashover occurs. In response to the fault signal a solid-state controllable , electric valve (71) connected between the excitation current source (17) and the alternator field winding (12f) is changed to a nonconducting state, whereupon the magnitude of excitation current in the alternator field winding (12f) is rapidly reduced toward zero and the alternator's output current is correspondingly decreased whenever a flashover occurs.
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 August 9, 1991 and granted January 28, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 9, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 9, 2013.
- 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.