Rail road freight car with damped suspension
CA 2396483 C · Owner: Forbes, James W. · Inventors: Forbes, James W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An auto rack rail road freight car is provided for carrying low density relatively , high value, relatively fragile lading. The car has trucks that have multiple dampers in a , four corner arrangement in the sideframes. The dampers may include damper wedges , having primary and secondary wedge angles. The spring groups in the side frames are , relatively soft, giving a low vertical bounce natural frequency. In an articulated , embodiment, differentially placed ballast is mounted in a biased arrangement to load the , coupler end trucks to encourage a dynamic response similar to the dynamic response of , the internal trucks.
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 1, 2002 and granted September 10, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 1, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 1, 2024.
- 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.