Coupler for use with a water main valve
CA 2205850 C · Owner: Klaptchuk, Peter · Inventors: Klaptchuk, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A coupler for use in replacing a corroded coupler on a buried water main valve without extensive soil excavation is disclosed. A pole having a cotter pin removal tool is provided to remove the cotter pin holding a corroded coupler in place about the valve. A rod having a fastener mounted on its lower end is releasably attachable to the water main valve. The rod carries a sleeve which slidably carries a latching device which is movable from an upper position in which the fastener carried by the rod is mountable on the water main valve, and a lower position in which the fastener is locked in position, allowing the valve to be rotated. The latching device carries a fastener mateable to 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 May 22, 1997 and granted January 8, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 22, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 22, 2019.
- 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.