Progressive air spring
CA 2267553 C · Owner: Desrochers, Pierre · Inventors: Desrochers, Pierre
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved suspension device of the air spring type which comprises a hydraulic shock absorber having a body a piston rod extending outwardly from an end, of the body, a flexible diaphragm extending between the body and an upper portion of, the piston rod to thereby define a chamber surrounding the piston rod and an upper, portion of the body. A liquid is introduced to occupy at least a portion of the chamber, and subsequently pressurized air is introduced into an upper portion of the chamber. The arrangement permits one to reduce the jounce and rebound movement of the suspension device.
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 30, 1999 and granted December 5, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 30, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 30, 2021.
- 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.