Polymers and method for inhibiting hydrate formation
CA 2178366 C · Owner: Oelfke, Russell Harlan · Inventors: Colle, Karla Schall; Oelfke, Russell Harlan; Talley, Larry Dalton
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel copolymers of N-vinyl amides and acrylamides and N-allyl amides and acrylamides are useful for inhibiting the formation of clathrate hydrates in a fluid having hydrate forming constituents. More specifically the novel copolymers can be used in treating a petroleum fluid stream such as natural gas conveyed in a pipe to inhibit the formation of a hydrate restriction in the pipe. The hydrate inhibitors used for practicing the method of the present invention comprise substantially water soluble polymers having N-vinyl amide or N-allyl amide units. The novel copolymers have at least either an N-vinyl amide monomeric unit or an N-allyl amide monomeric unit in combination with an acrylamide …
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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
- Filed June 6, 1996 and granted April 17, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 6, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 6, 2018.
- 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.