Process for the manufacture of aliphatylphosphinic acid derivatives
CA 1310976 C · Owner: Baylis, Eric Keith · Inventors: Baylis, Eric Keith; Wardleworth, Peter Stephen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for the manufacture of aliphatylphosphinic acid derivatives Abstract of the Disclosure, A process for the production of aliphatylphosphinic acid derivatives especially of alkyl dialkoxyalkylphosphinates having the formula I I, in which R is C1-C4-alkyl and R' is hydrogen or C1-C4-alkyl comprising, reacting, in the presence of an acidic catalyst aqueous phosphinic acid, with the corresponding trialkyl orthoester having the formula II: (RO)3CR' II, in which R and R' have their previous significances the amount of the, orthoester of formula II used being equal to or in excess of the, stoichiometric amount of both water and phosphinic acid present in the aqueous phosphinic acid reactant.
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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 December 1, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 1, 2009.
- 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.