Hydraulic railroad retarder
CA 1076921 A · Owner: Abex Corporation · Inventors: Yee, Bing S.; Frank, Earl E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to hydraulic apparatus as used in a railway classification yard having hydraulically operated retarders installed at selected positions along the classification track system. The apparatus includes a plurality of motor-driven pumps at least one being normally active and another one being normally inactive, serving as a reserve pump. Each pump is provided with a filter unit through which the pump moves fluid under pressure. The pressure drop across each filter may be sensed and the reserve pump may be activated if the pressure drop exceeds a predetermined value indicating unacceptable filter efficiency, the normally active pump being deactivated A signal may be …
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 May 6, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 6, 1997.
- 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.