Bis-benzotriazolyl compounds and polymeric materials stabilized therewith
CA 2000934 C · Owner: Eastman Chemical Company · Inventors: Wang, Richard Hsu-Shien; Myers, Garry Lynn
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are bis-benzotriazolylphenol compounds having the formula, (see fig. I), wherein R1 and R2 each is a 2-benzotriazolyl radical; R3 and R4 each is hydrogen, alkyl, aralkyl alkoxy, aryl, carboxy, alkoxycarbonyl or halogen; and A is 1,3- or 1,4-phenylene. Also disclosed are synthetic polymeric materials stabilized with one of the above compounds.
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 October 18, 1989 and granted August 3, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 18, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 18, 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.