Well packer
CA 2075431 A1 · Owner: Head, Philip F. · Inventors: Head, Philip F.; Head, Philip F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An inflatable well packer includes several annular layers 1,3,5,7 of material, consisting of a series of oriented fibres 31 encapsulated in a resin. The layers 1,3,5,7 are corrugated along the direction of their circumference such that pressure from the bore through the annular layers causes the corrugations to at least partially unravel thus causing, inflation of the well packer. The fibres 31 within each layer 1,3,5,7 are oriented along the length of the layer such that, their orientations vary along the length of the layers 1,3,5,7. A method of manufacturing the well packer is also described. Figure 1 to accompany abstract.
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 August 6, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 6, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 6, 2014.
- 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.