Railway truck bolster friction assembly
CA 2011778 C · Owner: Wiebe, Donald · Inventors: Wiebe, Donald
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A railway truck assembly provides sprung support of a car body with respect to the truck wheels by means of compression springs interposed between axle carried supports such as truck side frames and a car body support such as a bolster wherein biased, friction assemblies provide fit-up and friction damping of relative motion between the axle carried supports and the car body support the friction assemblies including rigid metallic friction members and elastomeric elements received in a pocket formed by spaced surfaces which engage the respective members with the elastomeric elements in biased engagement with a pocket surface and having an elastic characteristic to provide an elastomeric …
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 March 8, 1990 and granted April 2, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 8, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 8, 2012.
- 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.