Adjustable-length compression spring and seat provided therewith
CA 2484249 C · Owner: Knapp, Rainer · Inventors: Knaust, Holger; Boehm, Walter; Knapp, Rainer
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A compression spring comprises a casing in which a piston is arranged for displacement the piston being mounted on a piston rod. In the casing provision is made for two sectional casing chambers which are filled with pressure fluid at least one of which being defined by the piston. A first operating valve in an open position, connects the sectional casing chambers to each other and in a shut-off position, blocks the compression spring. An additional throttle element ensures that an actuation and overflow assembly between the sectional casing chambers is completely open only when the throttle element with the valve pin tripped, is simultaneously moved by corresponding actuation into a …
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 October 6, 2004 and granted November 20, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 6, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 6, 2026.
- 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.