Water-soluble, uv-absorbing and/or fluorescent components with very high isoelectric points
CA 2563809 C · Owner: Lalwani, Sanjiv K. · Inventors: Vigh, Gyula; Lalwani, Sanjiv K.; Nzeadibe, Kingsley
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Water-soluble, UV-absorbing and/or fluorescing compound having an isoelectric point greater than 10, can be obtained using molecules chosen from the group of molecules consisting of those containing at least one secondary alcohol OH group with a pKa value greater than 10 and at least one amino group with a pKb value smaller than 5, those containing at least one primary alcohol OH group and at least one secondary alcohol OH group with respective pKa values greater than 10 and at least one amino group with a pKb value smaller than 5 or a quaternary ammonium group, and those containing at least two secondary alcohol OH groups with respective pKa values greater than 10 and at least one …
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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 April 22, 2005 and granted June 9, 2015. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 22, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.