Cyclic process for producing alkali solution of cellulose carbamate, precipitating the carbamate and recovering the chemicals
CA 1236094 A · Owner: Neste Oy · Inventors: Fors, Jan; Turunen, Olli T.; Huttunen, Jouko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cyclic process for producing an alkali solution of cellulose carbamate, for precipitating the cellulose carbamate from the alkali solution, and for recovering and recycling the chemicals, comprises the following steps: (a) an alkali solution of cellulose carbamate is prepared by dissolving cellulose carbamate in an aqueous solution of sodium hydroxide, (b) the solution obtained in step (a) is brought into contact with a precipitating solution containing sodium carbonate, whereby the cellulose carbamate is precipitated and can be separated from the solution, (c) into the solution obtained in step (b) carbon dioxide is passed for transforming the sodium hydroxide into sodium carbonate (d) …
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 May 3, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 3, 2005.
- 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.