Drilling fluid comprising a high-amylose starch
CA 2417811 A1 · Owner: Hanseland B.V. · Inventors: Stover, Bernhard Emile
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to drilling fluids used in methods for drilling wells into subterranean formations containing oil gas or other minerals for the , purpose of extraction and production of said minerals and the use of starch in such fluids. The invention provides a method for drilling such a well using a drilling fluid comprising a high-amylose starch or starch-blend.
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 July 31, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 31, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 31, 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.