Stable aqueous formulations of fluorescent whitening agents
CA 2015714 C · Owner: Novartis Ag · Inventors: Kuhl, Eickhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Stable formulations of fluorescent whitening agents (fwas) containing a) a fluorescent whitening agent of the pyrazoline series b) 0.1 - 10 mol %, relative to the fluorescent whitening agent of one or more reducing, sulfur compounds, c) if appropriate auxiliaries and, d) water, a process for their preparation and the use of formulations of this type for the whitening of, textiles are described.
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 April 30, 1990 and granted January 22, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 30, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 30, 2012.
- 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.