Storage-stable formulation of fluorescent whitening mixtures
CA 2082202 C · Owner: Zelger, Josef · 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 of whitening mixtures comprising at least two anionic, fluorescent whiteners, which preferably contain at least one sulfonic acid radical; an, anionic polysaccharide; dispersants and water and if appropriate auxiliaries. , These formulations are particularly suitable for the preparation of liquid washing agents.
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 November 5, 1992 and granted July 29, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 5, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 5, 2014.
- 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.