Process for the preparation of glyoxal monoacetals
CA 1268773 C · Owner: Blanc, Alain · Inventors: Chastrette, Francine; Blanc, Alain; Hamedi-Sangsari, Farid
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for the preparation of glyoxal monoacetals" ABSTRACT OF THE DISCLOSURE, This process for the preparation of products of general formula (I):, (I), wherein either R1 and R2 which are identical, represent a, -CHRR3 group in which R and R3, which are identical or different, represent an alkyl, alkenyl or aralkyl group or R1, and R2, which are identical, represent a -CH2R group in which, R represents a hydrogen atom an alkyl, alkenyl or aralkyl, radical, or R1 and R2 together form a -CH2-(CRR)n-CHRradical, in which n represents 0 or 1 and R retains the meaning given previously, is characterised by reacting glyoxal in the presence of an acid catalyst with an excess of the corresponding …
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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 May 8, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 8, 2007.
- 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.