Catalysts
CA 2023545 A1 · Owner: Runciman, Peter J. I. · Inventors: Gardiner, Stuart P.; Runciman, Peter J. I.; Ballard, Denis G. H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
CATALYSTS, A polymerisation process which comprises contacting at least one polar acrylic type or maleimide monomer under polymerisation conditions with a catalyst system comprising a catalyst comprising (i) and (ii): (i) a tetracoordinate organosilicon, organotin or organogermanium initiator having at least one initiating site in which a silicon, tin or germanium atom is bound by a nitrogen or phosphorus atom to a nitrogen- or phosphorus-containing group which is devoid of any reactive hydrogen atom, (ii) a co-catalyst which is a source of fluoride bifluoride, cyanide, cyanate, aliphatic and aromatic mono-sulphonate, or azide ions or a Lewis acid and, which ions or Lewis acid are/is …
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 August 17, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 17, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 17, 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.