Production and use of quaternary phosphonium halides
CA 1069937 A · Owner: Hoechst Aktiengesellschaft · Inventors: Staendeke, Horst; Lippsmeier, Bernd; Hestermann, Klauss
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
PRODUCTION AND USE OF QUATERNARY PHOSPHONIUM HALIDES ABSTRACT OF THE DISCLOSURE:, Production of quaternary phosphonium halides of the general formula:, R1R2R3R4PX, in which R1 R2, R3 and R4 stand for identical or, different alkyl groups having from 1 to 4 carbon atoms and X stands for halogen, especially for chlorine or bromine. The compounds are more especially made by flowing hydrogen phosphide or a primary phosphine R1PH2 or secondary phosphine R1R2PH or tertiary phosphine R1R2R3P and an alkyl halide R4X in a molar ratio from 0.02 to 10, at a temperature from 100 to 500°C under a, pressure of up to 10 atmospheres gauge and for a period from 0.5 to 500 seconds over a catalyst and …
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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 January 15, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 15, 1997.
- 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.