Systems and methods for making pipe liners
CA 2589973 C · Owner: Stringfellow, William Doyle · Inventors: Charboneau, Kenneth Ray; Stringfellow, William Doyle; Catha, Stephen Crockett
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A liner (12) for pipe, the liner comprising a first layer (10) comprising a hollow cylinder of polymeric material, a second layer (20) comprising wrap material, the wrap material wrapped around the first layer a third layer (30) , comprising wrap material wrapped around the second layer the liner (12) , having a first end spaced apart from a second end at least one strengthener , member (40) on the liner and extending from the first end to the second end of the liner, the liner (12) comprising a stand-alone structure.
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 November 21, 2005 and granted February 4, 2014. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 21, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.