Eradication of bis-chloromethyl ether and 1,1,1,2- tetrachloroethane from chloroacetyl chloride
CA 1106402 A · Owner: The Dow Chemical Company · Inventors: Dhingra, Yog R.; Bredeweg, Robert A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for removing bis-chloromethyl ether and l,1,1,2-tetrachloroethane from a mixture comprising these two materials and chloroacetyl chloride by contacting the mixture with a catalytic amount of ferric and/or aluminum cations at a temperature from 50°C to 140°C and a residence time of from 15 to 120 minutes. This process can remove bis-chloromethyl ether to a concentration of less than 0.5 ppm and 1,1,1,2-tetrachloroethane to a concentration of 0.05 weight percent, both based on the chloroacetyl chloride. 18,465-F
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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 August 4, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 4, 1998.
- 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.