Secondary suspension system for rail vehicles
CA 2120144 C · Owner: Daimlerchrysler Rail Systems Gmbh · Inventors: Richter, Wolfgang-Dieter; Uebel, Lutz; Weeger, Engelbert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A secondary suspension for rail vehicles comprises a steel helical spring or, elastomeric spring and a lifting element, such as an hydraulic cylinder in series between, a wagon body and a bogie. The lifting element raises and lowers the wagon body relative to the bogie. A locking device is actuable to lock the lifting element when the wagon body is in its raised position. A hydraulic or electromechanical chucking element may be arranged in parallel operating relation with the springs.
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 July 30, 1993 and granted February 18, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 30, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 30, 2015.
- 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.