Caustic stable nonionic surfactant compositions and methods for their use
CA 2311998 A1 · Owner: Welch, Michael C. · Inventors: Gessner, Thomas B.; Welch, Michael C.; Zack, Kenneth L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is provided a surfactant composition resistant to degradation comprising a, caustic material and a nonionic surfactant wherein the nonionic surfactant is , the reaction product of a nonionic intermediate and isobutylene oxide. The nonionic intermediate, preferably comprises a copolymer of two or more alkylene oxide monomers. The reaction product has a hydroxyl number that is at least 70% lower in comparison to the, hydroxyl number of the nonionic intermediate.
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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 20, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 20, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 20, 2022.
- 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.