Alkyl vinyl ether polymers containing a lactam functionality
CA 2023213 A1 · Owner: Chaudhuri, Ratan K. · Inventors: Chaudhuri, Ratan K.; Shih, Jenn S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to polymers containing units of the structure, A. B. and , or, B-1. or B-2. or mixtures of A with more than one of B B-1 and B-2;, wherein R and R1 are each independently C1 to C18 alkyl;, R2 is oxygen, sulfur or -NR5-; R5 is hydrogen or lower alkyl;, R3 is alkylene having from 3 to 6 carbon atoms optionally mono- or di- substituted with lower alkyl; W is hydrogen, -NH4, an alkali metal or an alkaline earth metal;, Y is alkylene;, Z is hydrogen -NH4, an alkali metal or an, alkaline earth metal or mixtures thereof; X is lower alkyl, a hydroxy phenyl radical or mixtures thereof;, t has a value of from 2 to 8 and m, m', m" and n independently have a value of from 30 to …
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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 August 14, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 14, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 14, 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.