Process for preparation of hydrogen peroxide
CA 1295809 C · Owner: Eka Nobel Ab · Inventors: Andersson, Ulf Mikael; Bengtsson, Erik Alvar
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to the production of hydrogen peroxide according to the per se well known anthraquinone process. More particularly the invention relates to the production of hydrogen peroxide according to the anthraquinone process using particular solvents which give very good solubility for anthrahydroquinones and also for anthraquinones. The solvents used according to the present invention are certain cyclic urea derivatives.
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 February 18, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 18, 2009.
- 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.