Installing a pipe in an existing pipeline
CA 2216096 C · Owner: British Gas Plc · Inventors: Dickson, Dudley Trevor
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A seal (210) is fed into an existing pipe (12) to a position beyond the end (10) of the pipe. Manipulation of an elongate assembly (200) breaks the filaments (212) allowing the seal (210) to deploy. The assembly (200) is retracted to engage the seal body (226) with the end (10) of the pipe (12). A plastic pipe (230) is advanced into the pipe (12) until a steel nose-piece (232) carried by the leading end of the plastic pipe (230) engages the frustoconical end (224) of the seal assembly and bridges electrical contacts (226) to indicate that the plastic pipe (230) is correctly positioned. The space (238) between the existing pipe (12) and the plastic pipe (230) is filled with sealant …
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 April 3, 1996 and granted December 23, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 3, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 3, 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.