Purification of vinyl chloride
CA 1052726 A · Owner: Lummus Company (The) · Inventors: Unger, Harold; Long, Raymond H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure Vinyl chloride is separated from vinyl chloride feed which contains methyl chloride and at least one C4 hydrocarbon. The feed is fractionally distilled in a first fractional distillation column to recover methyl chloride and vinyl chloride as overhead. The methyl chloride-vinyl chloride overhead is fractionally distilled in a second column to recover vinyl chloride as bottoms product. Monomer grade vinyl chloride in the order of 99.99% may be recovered. -i-
Read the whole patent
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 17, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 17, 1996.
- 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.