Triazine-based light stabilizers for plastics
CA 2005234 C · Owner: Nelson, Richard Victor · Inventors: Nelson, Richard Victor; Stephen, John Fergus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A compound of the formula, (see fig. I) where T is the trivalent triazine radical (see fig. II), and where A is the hindered piperidino moiety (see fig. III), wherein R1 is selected from the group consisting of hydrogen, oxyl, hydroxyl, a straight or branched chain methylene-linked alkyl group of 1-18 carbon atoms an, alkanoyl group having 2-18 carbon atoms an alkenyl group, of 3-4 carbon atoms, an alkenyl group of 3-6 carbon atoms, an alkynyl group of 3-6 carbon atoms a, cyanomethyl group, a 2,3-expoxypropyl group a benzyl or, alkylbenzyl group of 7-15 carbon atoms a group, -CH2CH(OR2) -3 and a group of the formula -CH2CH (OR2)m-C (O) -Z, wherein Z is a group selected from -OR4 and -N (R5) …
Read the whole patent
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 12, 1989 and granted September 21, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 12, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 12, 2011.
- 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.