Aqueous - based oil well drilling fluids containing high amylose starch polymers
CA 2419344 A1 · Owner: Dino, David · Inventors: Dino, David
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to aqueous-based oil well drilling fluids containing a starch, polymer derived from a starch having an amylose content of at least 50% by weight. The starch, polymers provide high temperature fluid loss performance while having a minimum impact on, viscosity build when incorporated into well drilling fluids. They may also be used in other, applications for which cellulosic polymers have heretofore been employed because of their high, temperature tolerance and minimum impact on rheological properties compared to conventional, starch polymers.
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 February 20, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 20, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 20, 2025.
- 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.