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Expired Canadian patentCanada

Process for the manufacture of polycarboxylic acid polyglycidyl esters

CA 1077503 A · Owner: Lohse, Friedrich · Inventors: Zondler, Helmut; Lohse, Friedrich; Trachsler, Dieter

CIPO record

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Abstract From the Canadian patent

Process for the manufacture of polyglycidyl esters of aromatic, aliphatic, cycloaliphatic or heterocyclic polycarbocyclic acids, characterised in that polyalkyl esters having 1 to 4 C-atoms in the alkyl group. of the corresponding polycarbocyclic acids are transesterified with at least stoichiometric amounts of glycidol, in the presence of a thallium compound as the catalyst, in a temperature range of 50 to 120°C and the alcohol formed during the transesterification is removed continuously from the reaction mixture.

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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 13, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 13, 1997.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Filed—
GrantedMay 13, 1980
Term endedMay 13, 1997
Patent numberCA 1077503 A
Classification (IPC)C07D303/40 +1 more

Timeline

Timeline From CIPO dates

198119831985198719891991199319951997Patent grantedMay 13, 1980Term endedMay 13, 1997

Sources & verification

Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.