Aminocarboxylic acid breaker compositions for fracturing fluids
CA 2419829 A1 · Owner: Crews, James B. · Inventors: Crews, James B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
It has been discovered that aminocarboxylic acids are effective breakers for polymer-gelled aqueous fracturing fluids particularly in the, temperature range between about 120°F (49°C) and about 280° F (138°C). The aminocarboxylic acids are believed to act directly on the polymer and not to any great extent or not to as an effective extent on a crosslinking agent if, present. The polymer may be a polysaccharide and the aminocarboxylic, acid may be selected from the group including but not necessarily limited to, tetrasodium ethylenediaminetetraacetic acid (Na4EDTA) tetrasodium, propylenediaminetetraacetic acid (Na4PDTA) trisodium, hydroxyethylenediaminetetraacetic acid (Na4HEDTA) trisodium …
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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 February 25, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 25, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 25, 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.