Inflatable icepig and method of installing same
CA 2231609 A1 · Owner: Savard, Donald D. · Inventors: Savard, Donald D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An ice plug of the type having an annular chamber for clean process water to be frozen to temporarily plug a section of a pipeline is described in, which the supply of clean process water is drawn from a bottom layer of water filling the inspected or repaired pipeline. Also disclosed and claimed is an improved ice plug which carries a reservoir of clean process water which is injected into the annular space limited by a flexible seal disposed between the, process water in the annular interspace and the inner wall of the pipeline. An improved method of freezing an ice plug is also disclosed and claimed. It utilized a modified pneumatic excavation tool avoiding the need for the usual jacket …
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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 10, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 10, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 10, 2020.
- 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.