32p thiophosphate preparation
CA 2104876 A1 · Owner: Creighton, Andrew M. · Inventors: Jeffery, William A.; Creighton, Andrew M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
2104876 9214679 PCTABS00015, 32P-Thiophosphates of general formula formula (I) wherein n = , 1, 2 or 3 and each M, which may be the same or different is H or, a cation, are prepared by heating H332PO4 or a salt thereof with at least an equivalent amount of a thiophosphoryl halide and then treating the reaction product with an aqueous medium to hydrolyse the reaction product and form the 32P thiophosphate. Said reaction product is described as being a diphosphetane of formula (II), wherein X is halogen.
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 February 25, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 25, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 25, 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.