Device for the protection of track relays from electrical disturbances
CA 2000250 A1 · Owner: Esacontrol S.P.A. · Inventors: Ripamonti, Paolo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention refers to a device for protecting track relays from electrical distrubances originating from the traction current, of the type having: - a control signal generator;, - a receiver for said signal; - a signal inverter, to invert periodically the polarity of the signal emitted. According to the invention means are provided down-, stream from said receiver for assessing the frequencies forming the receive signal and which switch the track relay to the "line clear" position only after recognition of the frequencies forming the periodically inverted control signal (figure 1).
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 October 6, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 6, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 6, 2011.
- 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.