Particles having an attached stable free radical, polymerized modified particles, and methods of making the same
CA 2307580 A1 · Owner: Cabot Corporation · Inventors: Rawalpally, Thimma R.; Whitehouse, Robert S.; Warley, Russell L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A modified particle is disclosed wherein a particle has an attached group having formula (I), wherein A represents an aromatic group or an alkyl group; R1 represents a bond, an arylene group an alkylene group (i), (ii) or (iii), wherein R4 is an alkyl or alkylene group or an aryl or arylene group; R2 and R3, which can be the same or different represent hydrogen, an alkyl group, an aryl group, -OR5, -NHR5, -NR5R5, or -SR5 wherein R5, which is the same or , different represents an alkyl group or an aryl group; and SFR represents a stable free radical. Also disclosed is a modified particle or aggregate having attached a group having formula (II), wherein CoupA represents an Sicontaining …
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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 29, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 29, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 29, 2020.
- 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.