Tack-free elastomeric acrylate microspheres
CA 2124342 C · Owner: Delgado, Joaquin · Inventors: Delgado, Joaquin; Silver, Spencer F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a swellable, solvent-insoluble tack-free, elastomeric, acrylate microsphere having a shear storage modulus of at least 6.0 x 10 6 Pascals at 23 °C and 1 Hz and a Tg of less than about 0 °C, wherein the microsphere comprises the polymerization product of: (a) about 40 to about 99.7 equivalent weight % of free radically polymerizable monomer selected from the group consisting of alkyl acrylate esters of non-tertiary alkyl alcohols, the alkyl groups of the alcohols which comprise from about 4 to about 18 carbon atoms alkyl methacrylate esters of , non-tertiary alkyl alcohols the alkyl groups of, the alcohols which comprise from about 4 to about 18 carbon atoms and , …
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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 December 7, 1992 and granted March 25, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 7, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 7, 2014.
- 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.