Vinyl polyether alcohols
CA 2036070 A1 · Owner: Basf Aktiengesellschaft · Inventors: Baur, Richard; Diessel, Paul; Fischer, Martin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Vinyl polyether alcohols, Abstract of the disclosure: Vinyl polyether alcohols of formula I, I (R = C1-C25-alkyl, C2-C25-alkenyl or alkylaryl having a total of not more than 20 carbon atoms, A = 1,2-alkylene having from 2 to 4 carbon atoms and n = 1 to 20). These compounds serve as intermediates in the preparation of polyether sulfonates of formula III, III, (M = hydrogen alkali metal or ammonium). The vinyl polyether alcohols of formula I are useful as surface-active compounds for inclusion in surface-active compositions.
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 11, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 11, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 11, 2013.
- 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.