Method of separating and purifying cesium-131 from barium nitrate
CA 2571349 C · Owner: Isoray Medical, Inc. · Inventors: Brown, Garrett N.; Bray, Lane Allan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is described a method for purifying Cs-131. The method comprises the steps of: (a) dissolving neutron-irradiated barium comprising barium and Cs- 131, in a , solution comprising an acid; (b) concentrating the solution to leave solution and solids; , (c) contacting the solution and solids with a solution of 68-wt% to at least 90-wt% nitric , acid, whereby Cs-131 is dissolved in the acid solution and barium is precipitated as a , solid; and (d) separating the solids from the acid solution containing the Cs- 131, thereby , purifying the Cs-131.
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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 22, 2005 and granted April 22, 2014. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 22, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.