Analytical method and element for ferrous ion assay
CA 1313112 C · Owner: Mauck, John C. · Inventors: Warren, Harold C. Iii; Mauck, John C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
i-, ANALYTICAL METHOD AND ELEMENT FOR FERROUS ION ASSAY, Abstract of the Disclosure A dry multilayer analytical element for determination of Fe+2 is disclosed. The element includes a dye which complexes with Fe+2. The dye has the structure, wherein, R1 represents an electron donating group; or R1, together with the carbon to which it is attached, represents sufficient atoms to form a cyclic electron donating group fused to the phenyl group to which R1 is attached;, R2 represents an electron withdrawing group; and R3 represents H, Cl, F, Br or OR4 wherein R4 represents a hydrocarbon having from 1 to 20 carbon atoms.
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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
- Granted January 26, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 26, 2010.
- 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.