Method to control atom transfer radical polymerization
CA 2333926 A1 · Owner: Nakagawa, Yoshiki · Inventors: Ono, Shigeki; Nakagawa, Yoshiki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polymerization method characterized by conducting the atomic-transfer radical polymerization of a vinyl monomer so as to satisfy at least one requirement selected from the group consisting of the following (1) (2), (3), and (4): (1) the polymerization is conducted under substantially dehydrating conditions; (2) the polymerization is conducted in the presence of a nitrile compound; (3) the polymerization is initiated by adding a ligand for a polymerization catalyst to the system; and (4) the rate of polymerization is controlled by changing the activity of the polymerization catalyst during polymerization. Thus, an easy and safe method for initiating the atomictransfer radical …
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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 June 1, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 1, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 1, 2021.
- 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
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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.