Improvements in or relating to a metering device
CA 2453752 C · Owner: Penn, Laurence Richard · Inventors: Penn, Laurence Richard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A metering device of the type in which a shuttle moves axially within a chamber between two terminal positions with the chamber having fluid inlet and outlet means at each end so that fluid may enter through one end to move the shuttle to cause fluid to be ejected through the other end and vice versa, in which a control valve is provided to control the fluid flow the control valve being a spool valve having a spool sealingly slidable within a bore the spool valve being associated with means to drive the spool between two alternate positions in response to the shuttle reaching each end of the chamber.
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 December 19, 2003 and granted February 26, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 19, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 19, 2025.
- 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.