Producing carbon-14 isotope from spent resin waste
CA 2061307 C · Owner: Ontario Hydro · Inventors: Krochmalnek, Leonard S.; Bartoszek, Frank E.; Chang, Francis H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for the recovery of carbon-14 (C-14) from a mixture of inert gas and carbon-12 (C-12) carbon-13, (C-13) and C-14 dioxides. The mixture is cooled to a temperature below the solidification point of carbon dioxide to obtain solid carbon dioxide. The solid carbon dioxide is volatilised to provide substantially pure carbon dioxide gas which is reduced to carbon monoxide gas by reaction with metal. The carbon monoxide gas is cooled to obtain liquefied carbon monoxide. A feed of the liquefied carbon monoxide is subjected to fractional distillation and a bottoms rich in C-14 monoxide and poor in C-12 monoxide is collected and a distillate poor in C-14 monoxide and rich in C-12 monoxide is …
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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 February 17, 1992 and granted December 29, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 17, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 17, 2014.
- 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.