Storage-stable whitener formulation
CA 2010909 C · Owner: Ciba-Geigy Ag · Inventors: Zelger, Josef; Fringeli, Werner
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Storage-stable formulations which contain an anionic fluorescent whitening agent which, preferably contains at least one sulfonic acid radical in an amount of 10-60% , by weight, based on the total weight of said formulation an anionic polysaccharide and , water, as well as optional auxiliaries, and the use of these formulations for the preparation of detergent, compositions.
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 February 26, 1990 and granted January 22, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 26, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 26, 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.