Method of installing pipes
CA 2220962 C · Owner: Bg Plc · Inventors: Stoves, Derek; Robinson, William Edgar
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A steel service pipe (12) is connected to a main (10) by a tee (14). A flexible assembly (18) is inserted through the open end of the pipe (12) and through the tee (14) into the main (10). The flexible assembly includes a section of lower stiffness (22) and a ball and socket connection (24) of even lower stiffness at its leading end. The ball (30) is connected to a weight (34). The weight (34) falls down on entering the tee and creates a turning moment on the assembly (18). A plastic pipe (60) is inserted through the open end of the pipe (12) over the assembly (18) and is inserted through the tee (14) into the main (10). The pipe (60) has a corrugated leading end (64) which is more …
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 20, 1996 and granted April 9, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 20, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 20, 2018.
- 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.