Pyridine-free karl fischer reagent useful in determining water
CA 1185508 A · Owner: Merck Patent Gesellschaft Mit Beschraenkter Haftung · Inventors: Krenn, Karl-Dieter; Fischer, Wolfgang
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An essentially pyridine-free Karl Fischer reagent useful in the determination of water is provided herein. It comprises a dissolving agent containing sulfur dioxide and a pyridine substitute in a Karl Fischer solvent and a titrating agent containing iodine in a Karl Fischer solvent. The pyridine substitute is an alkali metal benzoate an alkaline earth metal, benzoate or ammonia and the reagent is essentially free of pyridine. These pyridine substitutes have a very good solubility in the reagent solution react with alcohols virtually without the formation of esters and have a, very high stability in storage.
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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
- Granted April 16, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 16, 2002.
- 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.