Dilutable aluminium triformate tanning agents in the form of highly concentrated, storable aqueous solutions and their use
CA 2113548 A1 · Owner: Schroeder, Christine · Inventors: Zauns-Huber, Rudolf; Hieber, Jochen; De Riese-Meyer, Loert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Described is the use of at least substantially storage-stable supersaturated and acidified aqueous solutions of mixtures of aluminium triformate and alkali-metal and/or alkaline-earth formates as a means of supplying a water-dissolved mineral tanning agent based on aluminium formate for the tanning of leather and/or hides using little or no chromium. The invention thus concerns in, particular, storage-stabilized supersaturated and acidified aqueous solutions of this kind which also contain small quantities of stabilizers, preferred stabilizers being 1,2,3,4-butanetetracarboxylic acid and/or xanthane gum. The invention also concerns the use of such stabilized supersaturated aqueous forms of …
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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 6, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 6, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 6, 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
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.