Water-reducible nigrosine dye compositions
CA 2199673 C · Owner: Morton International, Inc. · Inventors: Caputo, Peter A.; Zimin, Alejandro, Sr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A water-reducible composition comprises A) between about 20 and about 50 wt% of a water-insoluble nigrosine B) between, about 25 and about 40 wt% of a solvent having a flashpoint of at least about 141~F (61~C) and a boiling point of at least about 280~F (138~C.), and C) between about 20 and about 40 wt% of a non-ionic surfactant, the weight percentages being based on total weight of A), B), and C). The composition is prepared by dissolving the nigrosine A) in a C1-C3 alkanol to form an alcohol solution mixing the, alcohol solution with the solvent B) and non-ionic surfactant C, and subsequently stripping the C1-C3 alkanol.
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 March 11, 1997 and granted August 31, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 11, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 11, 2019.
- 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.