Process of removing and concentrating desired ions from solutions thereof
CA 2007311 C · Owner: Bradshaw, Jerald S. · Inventors: Tarbet, Bryon J.; Biernat, Jan F.; Bochenska, Maria
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The process of the invention comprises removing and concentrating certain ions, such as the transition metal ions, from solutions thereof admixed with other ions which may be present in much higher concentrations by forming a complex of the desired ion(s) with a compound (see formula I), wherein B and D are each a radical selected from the group consisting of N(R3), N(R3)CH2 O. OCH2, S and SCH2, with the further proviso that if B is selected from the group consisting of O, OCH2, S and SCH2, then D must be selected from the group consisting of N(R3) and N(R3)CH2 ; E is a radical selected From the group consisting of H NH(R3), SH, OH, lower alkyl, and N(R3)(CH2CH(R1)CH2O b(CH2)a …
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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 January 8, 1990 and granted March 26, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 8, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 8, 2012.
- 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.