Low-molecular and high-molecular emulsifiers, particularly based on polyisobutylene, and mixtures thereof
CA 2448033 A1 · Owner: Basf Aktiengesellschaft · Inventors: Rath, Hans Peter; Schauss, Eckard; Schuermann, Gregor
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to low-molecular and high-molecular diblock emulsifiers particularly based on polyisobutylene, of general formulas (Ia) and (Ib) and , to mixtures thereof, whereby: La represents a polyisobutylene group having a numerical average molecular weight Mn ranging from 300 to 1000; Lb represents a polyisobutylene group having a numerical average molecular weight Mn ranging from 2000 to 20000; -A- represents -O- -N(H)- or N(R1)-; M+ represents H+, an alkali metal ion, 0.5 alkaline-earth metal ions or NH4+ whereby in NH4+, one , or more H's can be substituted by alkyl radicals; R represents a linear or branched saturated hydrocarbon radical which supports at least one , …
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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 May 17, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 17, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 17, 2024.
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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.