Preparation of carboxylic acid anhydrides
CA 1183162 A · Owner: Halcon Sd Group, Inc. (The) · Inventors: Rizkalla, Nabil
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A carboxylic acid anhydride such as propionic anhydride, is prepared from an olefin and a carboxylic acid in carbonylation processes comprising the use of a halide carbon monoxide and, a molybdenum-nickel or tungsten-nickel component in the presence of a promoter comprising an organo-phosphorus compound or an organo-nitrogen compound wherein the phosphorus and nitrogen are trivalent.
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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 February 26, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 26, 2002.
- 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.