Process for the preparation of polyalkylene glycol bis-ethers
CA 2032980 A1 · Owner: Basf Aktiengesellschaft · Inventors: Houben, Jochen; Oftring, Alfred; Houben, Jochen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the preparation of polyalkylene glycol bisethers having the general formula I, R1-O-(A1-O)m-(A2-O)n-R2 I in which;, R1 and R2 are straight-chain or branched C1-C30-alkyl or C2-C30-alkylene groups; aryl radicals which can also be substituted by C1-C4 alkyl groups having a total of up to 12 carbon atoms; or aryl alkyl radicals having a total of up to 20 carbon atoms;, A1 and A2 are 1,2-alkylene groups having from 2-4 carbon atoms; and, m and n are from 1 to 100, by heating an alkoxylated alcohol or an alkoxylated phenol IIa, R1-O-(A1-O)m-H IIa, with an alkoxylated alcohol or phenol IIb H-O-(A2-O)n-R2 IIb, in the presence of an acid catalyst.
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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 December 21, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 21, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 21, 2012.
- 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.