Process for preparing dispersible sulfate, preferably barium sulfate nanoparticles
CA 2564808 C · Owner: Nanosolutions Gmbh · Inventors: Pfundt, Heiner; Berkei, Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a process for the manufacture of optionally doped nanoparticulate metal sulfate nanoparticles wherein the metal is selected from polyvalent metals or monovalent transition metals said process , comprising the step of heating a reaction mixture comprising a) a polar organic solvent comprising at least two hydroxy groups or a polar organic solvent comprising at least one sulfoxide group b) a source of a polyvalent , metal or monovalent transition metal a sulfate source, and optionally a , dopant metal source and c) a base selected from i) bases having an aromatic Ncontaining heterocycle with the exception of imidazole ii) bases having an aliphatic …
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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 May 4, 2004 and granted July 3, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 4, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 4, 2026.
- 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.