A cementing composition including a dispersant agent for cementing operation in oil wells
CA 2416562 C · Owner: Sofitech N.V. · Inventors: Volpert, Edgar
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a cementing composition for cold zones cementing operations in an oil well or analogous said composition comprising a aqueous fluid base, solid particles including cement particles and a dispersing agent , in solution in the aqueous fluid base said dispersing agent having a comb-, like structure composed of a graft copolymer said graft copolymer being , constituted by a backbone carrying grafted chains.
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 September 24, 2001 and granted February 8, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 24, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 24, 2023.
- 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.