Poly(1-hydrocarbyloxy-2,2,6,6-tetraalkylpiperidine) light stabilizers
CA 2012495 C · Owner: Galbo, James P. · Inventors: Galbo, James P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Poly(1-hydrocarbyloxy-2,2,6,6-tetraalkylpiperidine) compounds are effective light stabilizers in protecting organic polymers against the deleterious effects of actinic light. These compounds have the formula I or II (see above formulas) , where, m is 2 to 10 n is 1 to 5, R1 and R2 are independently alkyl of 1 to 4 carbon atoms or R1 and R2 together are pentamethylene L is an m-valent radical of an alkane of 1 to 18 carbon atoms, an alkene of 2 to 18 carbon atoms an m-valent radical, of a cycloalkane or cycloalkene of 5 to 12 carbon atoms an, m-valent radical of a saturated or unsaturated bicyclic or tricyclic hydrocarbon of 7 to 12 carbon atoms or an m-valent radical of an aryl, alkyl …
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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 March 19, 1990 and granted February 8, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 19, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 19, 2012.
- 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.