Polymers containing chemically bound amine antidegradants
CA 2036645 C · Owner: Wideman, Lawson G. · Inventors: Wideman, Lawson G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is disclosed a polymer consisting essentially of segmeric units, a portion of said units consisting of at least one segmeric unit having the structural formula:, or, wherein X is selected from the group of monovalent radicals, consisting of:, wherein R is hydrogen or methyl; R1 is hydrogen or methyl; R2 is selected from the group of radicals consisting of hydrogen, hydroxy, -NH2; R3 and R4 are independently selected from the group of radicals consisting of alkyls having 3 to 12 carbon atoms cycloaliphatics having 6 carbon atoms, aryls having 6 to 12 carbon atoms and aralkyls having 7 to 12 carbon atoms; and R5, R6, R7 and R8 are independently selected from the group of radicals …
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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 February 19, 1991 and granted October 23, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 19, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 19, 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.