Isolation tool
CA 2243082 A1 · Owner: Canadian Fracmaster Ltd. · Inventors: Dyck, John; Flatekval, Gerald B.; Gotowik, Horst
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is described an improved pipeline isolation tool (10) for plugging a pipeline at a predetermined location, comprising a housing (30) adapted for movement through a pipeline (1), the housing (30) having first and second ends (29, 41), seals (48) disposed annularly about the housing (30) the seals (48) , being radially expandable into fluid sealing contact with an inner wall (2) of the pipeline (1), and a plurality of braking members (120) including grips (46) for frictionally engaging the inner wall (2) of said pipeline (1) to lock the isolation tool (10) in position against fluid pressure in the pipeline (1), the braking members (120) being selectively and repetitively movable …
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 January 28, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 28, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 28, 2019.
- 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.