Jackable oil rigs and corner columns for producing legs in an oil rig
CA 2063380 A1 · Owner: Offshore Innovation Limited A/S · Inventors: Foss, Gunnar; Rundhovde, Sture; Kjersem, Geir
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a jackable oil rig designed for large ocean depths and which comprises at least one leg and a deck having a jack system. The rig's leg comprises a number of corner columns together with transverse bracing stays and each corner column comprises a substantially annular outer pipe (26) in which a substantially annular inner pipe (28) is arranged. The annular space (27) between the inner wall of the outer pipe and the outer wall of the inner pipe is filled with a hardenable material such as concrete, capable of transferring forces between the pipes the, outer diameter of the outer pipe (26) being approximately constant over the whole length of the column (24) and the …
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 July 11, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 11, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 11, 2012.
- 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.