Elastomers and products having reduced hysteresis properties
CA 2069032 A1 · Owner: Doshak, John M. · Inventors: Hergenrother, William L.; Doshak, John M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of preparing an elastomer having reduced hysteresis properties comprises the steps of reacting an anionic polymer having at least one functional site, with about one equivalent of a sulfoxide compound having the formula to form an adduct, where R1 and R2 are organo groups selected from the group consisting of alkyls and sulfur substituted alkyls having from about 1 to about 20 carbon atoms, cycloalkyls having from about 3 to about 20 carbon atoms aryls and, halogen substituted aryls having from about 6 to about 20 carbon atoms and aralkyls having from about 7 to about 20 carbon atoms; and curing the adduct in the, presence of a suitable cure catalyst. Articles such as tires …
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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 20, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 20, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 20, 2014.
- 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.