Liner and method for lining a pipeline
CA 2324307 A1 · Owner: Woodward, Clive Anthony · Inventors: Woodward, Clive Anthony; Atkinson, Kirsten Elizabeth; Sanders, Trevor George
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a liner comprising a flexible material (1) with means adapted to increase the surface area thereof and adhesive/sealant (2) and a , release tape (3) with reinforcing strips (4). An example of a means of adapting the surface, whereby strips of adhesive/sealant (5) are applied to the release tape and then the flexible material (1) applied and compacted to form the profile. The liner is then formed into a tube. It may then be folded into a cruciform shape. An end elevational view of a folded liner in a pipe (6) prior to application of the 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 March 18, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 18, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 18, 2021.
- 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.