Process for the reduction of sulfoxide groups in polymers
CA 2133802 A1 · Owner: Frank, Georg · Inventors: Kulpe, Jurgen; Schleicher, Andreas; Frank, Georg
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a process for the preparation of polymer sulfides, which comprises treating compounds containing sulfoxide linking groups of the formula (I) -(Ar1)n-Xn-(Ar2)i-Y)j-(Ar3)k-Z)l-(Ar4o-W)p- (I) in which the symbols and indices have the following meaning:, Ar1, Ar2, Ar3 and Ar4 are identical or different arylene systems having 6 to 18 carbon atoms, W X, Y and Z are identical or different -SO2- -S-, -SO-, -CO, -O-, -CO2-, alkylene or alkylidene groups having 1 to 6 carbon atoms, preferably 1 to 4 carbon atoms, where at least one linking group W X, Y or Z must, be an -SO- group, n, m i, j, k, l, o and p are, identically or differently, 0 or an integer 1, 2, 3 or 4 where …
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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 October 6, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 6, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 6, 2016.
- 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
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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.