Polymerizable compositions
CA 2020473 C · Owner: Kuraray Co. Ltd. · Inventors: Kawashima, Mitsunobu; Omura, Ikuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Provided are polymerizable compositions comprising: (a) a sulfinate represented by the general formula (I wherein R1 and R5 each represents a substituent having 2 to 6 carbon atoms, R2, R3 and R4 each represents an atom or substituent inert to the below-described monomer (b) M n+, represents a n-valent cation and n represents an integer of 1 to 4 ; and, (b) a monomer. (a) is an aromatic sulfinate substituted with bulky groups at its positions 2 and 6. Since the bulky substituents dramatically suppress the addition of the sulfinate to the double bond of the monomers, e.g. (meth)acrylates (meth)acrylamides and derivatives thereof the compositions, can be stored at room temperature for at …
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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 July 5, 1990 and granted December 12, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 5, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 5, 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.