Expired Canadian patentCanada
Keto-diesters and their production
CA 1333401 C · Owner: Wang, Pen Chung · Inventors: Wang, Pen Chung
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for the preparation of keto-diesters which comprises reacting an alkyl ester of a 2-alkenoic acid and an aldehyde in the presence of a catalyst, wherein an aldehyde having two formylic hydrogen atoms is reacted in liquid phase solution with the ester.
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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 6, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 6, 2011.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 9, 1989
GrantedDecember 6, 1994
Term endedDecember 6, 2011
Patent numberCA 1333401 C
Classification (IPC)C07C69/73 +1 more
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.