Process for producing unsaturated dicarboxylic acid imide compound
CA 1338809 C · Owner: Matsushita Electric Works, Ltd. · Inventors: Yonemoto, Tatsuo; Matsumura, Masahiro; Saito, Eiichiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for producing an unsaturated dicarboxylic acid imide compound of formula (I): (I), wherein D represents a divalent organic group having at least one carbon/carbon double bond; R1 represents an nvalent organic group having at least one carbon atom; and n is an integer of 1 or above, which comprises reacting an unsaturated amide acid compound of formula (II):, (II), wherein D, R1, and n are as defined above with an, orthoester of formula (III):, (III) wherein R2 and R3, which may be the same or different each represents a monovalent organic group having at least one carbon atom, to form an unsaturated dicarboxylic acid amide acid ester compound of formula (IV):, (IV), wherein D, R1, …
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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 24, 1996. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 24, 2013.
- 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.