Flow line coupling
CA 2236710 C · Owner: Wilkie, Robert Graham · Inventors: Wilkie, Robert Graham; Clayson, Andrew
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A coupling assembly (10) for leak proof connection of the ends of two lengths of pipe or tubing. One end of a first pipe (12) is coupled to a coupling box (18) which is connected to or integrally formed on the end of a second pipe (14). The coupling box (18) has threads for engaging a nut (24) for securing the coupling. The coupling box (18) has a bore for receiving the end of the first pipe (12). The end of the first pipe (12) has an outer tapered surface for engaging an inner tapered surface of the coupling box (18) to form a metal to metal seal between the first pipe (12) and the coupling box (18). The bore also contains an engager (20, 22) for coupling the nut to the first pipe. …
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 September 3, 1997 and granted March 21, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 3, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 3, 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.