Lined pipe wherein the liner comprises a one-way valve
CA 2432002 A1 · Owner: Shell Canada Limited · Inventors: Szklarz, Karol Edward; Baron, John Joseph
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pipe (1) for the transport of fluids which pipe (1) is internally provided with a liner (2), wherein the liner (2) is provided with at least one nonreturn valve (16) arranged in the liner wall (7) wherein the non-return valve , (16) has an inlet end (18) arranged near the outer surface (9) of the liner wall (7) and an outlet end (19) arranged near the inner surface (10) of the liner wall (7).
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 December 19, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 19, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 19, 2023.
- 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.