Sulfonated unhydrogenated copolymers of styrene and butadiene
CA 2103875 C · Owner: Gorbaty, Martin L. · Inventors: Gorbaty, Martin L.; Peiffer, Dennis G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to polymeric compositions comprising unhydrogenated or substantially unhydrogenated sulfonated copolymers of (poly)styrene and a (poly)conjugated diene e.g. (poly)butadiene, or (poly)isoprene preferably (poly)butadiene containing less than about 1.0 wt.%, preferably less than about 0.8 wt.% sulfur preferably, from about 0.2 to about 0.7 more preferably from about 0.22 to about 0.6 wt.% sulfur, as well as base-neutralized products thereof. The invention includes the polymeric compositions produced by the process of sulfonating unhydrogenated copolymers of (poly)styrene and a conjugated diene, e.g. (poly)butadiene or {poly)isoprene preferably, (poly)butadiene, which …
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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 August 11, 1993 and granted November 20, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 11, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 11, 2015.
- 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.