Process for preparing n,n'-difluorodiazoniabicycloalkane salt, intermediate therefor, product and use of product
CA 2201604 C · Owner: Nagayoshi, Masayuki · Inventors: Adachi, Kenji; Tomizawa, Ginjiro; Umemoto, Teruo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a process for preparing a N,N'-difluorodiazoniabicycloalkane salt of the formula: (see formula I), by reacting a corresponding diazabicycloalkane or diazabicycloalkane Br.slzero.nsted acid salt and fluorine in the presence of a Br.slzero.nsted, acid or in the presence or absence of a base by reacting a corres-, ponding N,N'-difluorodiazoniabicycloalkane salt and an acid or salt by reacting a corresponding diazabicycloalkane and fluorine in the presence of a Br.slzero.nsted acid and then reacting an intermediate product and an acid or salt, or by reacting a corresponding diazabicycloalkane Br.slzero.nsted acid salt and fluorine in the presence or absence …
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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 August 2, 1996 and granted July 2, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 2, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 2, 2018.
- 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.