Process for the manufacture of glycolic acid
CA 1110655 A · Owner: Hoechst Aktiengesellschaft · Inventors: Arpe, Hans-Jurgen; Leupold, Ernst I.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the disclosure:, Glycolic acid is prepared by reacting paraformaldehyde or trioxane or a mixture thereof with formic acid in the liquid phase at a temperature of from 70 to 200°C in the presence of a strongly acidic catalyst.
Read the whole patent
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 October 13, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 13, 1998.
- 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.