Method of recovering caustic soda from spent pulping liquors
CA 1283256 C · Owner: Budney, John L. · Inventors: Budney, John L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of recovering sodium hydroxide from alkaline or neutral spent pulping liquor by the addition of metallic oxides, with the exclusion of a Sc, Ti V, Fe, Cu, Cd or, Hg oxide, to the spent liquor in order to directly convert sodium carbonate into sodium hydroxide followed by, separation and recycling of the metallic oxides to the spent liquor.
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 April 23, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 23, 2008.
- 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.