Diaminorhodamine derivatives
CA 2295880 A1 · Owner: Nagano, Tetsuo · Inventors: Kojima, Hirotatsu; Nagano, Tetsuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds represented by general formula (1) and reagents containing the same , for determining nitrogen monoxide (wherein R1 and R2 are amino groups bonded to the phenyl ring at positions adjacent to each other; R3 R4, R5 and R6 are , each independently C1-C6 alkyl; R7 R8, R9 and R10 are each independently hydrogen, C1-C6 alkyl, allyl or halogeno; R11 is hydrogen or C1-C18 alkyl; and X- is an anion). The compounds react with nitrogen monoxide efficiently to produce fluorescent compounds which emit intensive fluorescence when irradiated with a long-wavelength excitation light. The fluorescent compounds are detectable in a fluorescence region wherein little influence of …
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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 June 30, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 30, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 30, 2020.
- 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.