Alkyl vinyl ether polymers containing a lactam functionality
CA 2020041 A1 · Owner: Gaf Chemicals Corporation · Inventors: Chaudhuri, Ratan K.
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 a lactam functionality and having in its molecule repeating units of the general formula:, wherein R1 is C1 to C18 alkyl; R2 is oxygen, sulfur or amino;, R3 is alkylene having 3 to 6 carbon atoms optionally substituted with lower alkyl; Z is hydrogen, an alkali metal, an alkaline earth metal or ammonia;, n has a value of from 30 to 3,500 and t has a value of from 2 to 8;, and to the use and synthesis of said polymer.
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 June 28, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 28, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 28, 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.