Monoazo compounds, preparation thereof and use thereof as dyes
CA 2087954 C · Owner: GLEIßNER, ROLF · Inventors: GLEIßNER, ROLF; Springer, Hartmut
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Monoazo compounds, preparation thereof and use thereof as dyes, Monoazo compounds which possess fiber-reactive groups and have useful dye properties and are capable of dyeing hydroxyl- and/or carboxamido-containing materials in par-, ticular fiber materials, such as cellulose fibers and natural and synthetic polyamide, such as wool, in strong fast shades. They conform to the formula (1), where, Me is hydrogen or an alkali metal; K is a radical of the formula (2), (2) where Me has one of the abovementioned meanings and n is zero, or 1 (if zero, this group being hydrogen); D is a group of the formula (3a), (3b) or (3c) , (3a) (3b), (3c), where, Me has one of the abovementioned meanings R1 is …
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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 July 10, 1991 and granted May 20, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 10, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 10, 2013.
- 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.