Sub surface safety valve block, particularly suitable for the risers of offshore platforms
CA 1297786 C · Owner: Agip S.P.A. · Inventors: Donati, Francesco; Amendola, Giancarlo; Franceschini, Giuliano
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
1. CASE 2818, "SUB SURFACE SAFETY VALVE BLOCK PARTICULARLY SUITABLE, FOR THE RISERS OF OFFSHORE PLATFORMS" Abstract, Sub-surface safety valve block to be connected between a well head at sea bottom, and the lower end of a riser, in order to make it possible the production tube and/or the service tube of the completion string to be closed by means of gate valves, which sub-surface safety valve block is constituted by a valve body provided with a vertical through-bore which is tigthly closed at its upper end by a packer with which the upper portion of the completion string is connected, and at the bottom is tightly closed by a tubing hanger with which the lower portion of said completion …
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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
- Granted March 24, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 24, 2009.
- 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
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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.