Methacrylimide-containing polymer
CA 2006640 A1 · Owner: Anzai, Hisao · Inventors: Anzai, Hisao; Nishida, Kozi; Sasaki, Isao
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a thermoplastic methacrylimidecontaining polymer comprising 2 to 100% by weight of structural units represented by the following formula (I):, (I), wherein R is hydrogen or a hydrocarbon group having 1 to 20 carbon atoms, and 0 to 98% by weight of structural units derived form an ethylenically unsaturated monomer, wherein the number of fine particles having a size of 0.5 to 25 µm as measured by a particle counter in the polymer is not more than 50,000 per gram of the 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 December 27, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 27, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 27, 2011.
- 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.