Bleach plant operation
CA 1086905 A · Owner: Erco Industries Limited · Inventors: Rapson, W. Howard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The first bleaching stage of a bleach plant sequence is effected using mixtures of chlorine dioxide and chlorine at elevated temperatures above 35°C up to 70°C. Bleaching at these temperatures may be carried out without pulp viscosity lass and permits fresh water use in a countercurrent washing bleach plant to be decreased.
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 7, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 7, 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.
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.