Lining of pipelines and passageways
CA 1250737 A · Owner: Instiuform Holdings Limited · Inventors: Wood, Eric
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invntion provides that in inserting a resin impregnated liner into a pipeline or passageway and shaping same to the passageway surface followed by, curing of the resin to form a rigid lining inside the pipeline or passageway, there are placed in the passageway reinforcing circumferential coils or members which bond to the liner and provide extra resistance to compressive hoop stress.
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
- Granted March 7, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 7, 2006.
- 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.