Substituted aminopyrroles as stabilisers for chlorine-containing polymers
CA 2013048 C · Owner: Novartis Ag · Inventors: Wehner, Wolfgang; Wirth, Hermann O.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The compounds of formula I, wherein n is 1 or 2 R1 is C1-C4alkyl, R2, and R3 are, for example alkanoyl , or, alkanoyloxy or R3 may also be for example, alkanedioyl, are suitable for stabilising, chlorine-containing polymers against thermal and light-induced degradation. Soma of the compounds of formula I are novel.
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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 26, 1990 and granted November 21, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 26, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 26, 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.