Melamine derivatives as stabilisers for chlorine-containing polymers
CA 2033672 C · Owner: Ck Witco Vinyl Additives Gmbh · Inventors: Wehner, Wolfgang; Kostler, Hans-Gunter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compositions containing, a) a chlorine-containing polymer b) 0.01 to 1% by weight, relative to the chlorine-containing polymer of a , compound of the, formula I and/or its hydrochloride in which R is C6-C20alkyl, C3-C20alkyl interrupted by 1 to 5 oxygen atoms C1-, C20alkyl, substituted by 1 to 5 OH C3-C20alkenyl, C3-C8cycloalkyl, C1-C4alkylsubstituted, C3-C8Cycloalkyl, C7-C11phenylalkyl C7-C11phenylalkyl which is substituted on the, phenyl by 1 to 3 radicals, these radicals independently of one another, being , hydroxyl chlorine, Ct-C4alkyl, methoxy or ethoxy or R is furthermore a group of the , formula IIa or IIb, in which X is C1-C20alkyloxy, C1-C20alkylthio phenyloxy, phenylthio, …
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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 January 7, 1991 and granted March 13, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 7, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 7, 2013.
- 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
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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.