Method and generator for producing radioactive lead - 212
CA 2046546 A1 · Owner: Brunswick Corporation · Inventors: Norman, John H.; Mysels, Karol J.; Wrasidlo, Wolfgang A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and generator for preparing the radioisotope of lead, 212Pb, whereby 228Th in a closed, chamber, is allowed to decay to gaseous 220Rn which is then readily separated from the thorium and other decay products by diffusing the 220Rn gas into a second chamber where it, decays to 212Pb which can then be collected from the second chamber. The 228h preferably is amorphous such as thorium, stearate. Collection of 212Pb occurs in a medium of high and open porosity into which the 220Rn diffuses so that the decay products recoil into the medium. The 212Pb can be recovered from this medium by dissolving the medium or by reacting it with an antibody-chelating complex solution to entrap it in …
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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 July 9, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 9, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 9, 2013.
- 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.