Ballasting of semi-submersible rig
CA 2310012 A1 · Owner: Morvan, Pierre · Inventors: Titreville, Bernard; Morvan, Pierre; Kozicz, John Richard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A semi-submersible structure is adapted to carry consumable solid or liquid material such as mud, and removable equipment for example drilling tubulars. , Both consumables and removable equipment are removed from the structure during use, thereby reducing the structure's total mass. The structure is provided with pontoon means (4, 8) containing a first set of compartments (66 68, 70, 72, 84, 86, 88) for consumable material and ballast control means for introducing ballast into the first set of compartments to compensate for the removal of consumable material. The structure also includes dedicated ballast tanks (40, 42, 56, 106, 108), but the arrangement is such that if the first , set …
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 November 13, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 13, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 13, 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.