Bleaching process
CA 1193053 A · Owner: Pioneer Licensing, Inc. · Inventors: Kutney, Gerald W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Bleaching Process, A process for bleaching fibrous lignocellulosic pulp prepared at least partially by mechanical treatment which process comprises treating the pulp with a bleaching effective amount of a thiol compound of the general formula: R1X-Y-SR2, wherein Y is aryl or -(CH2)? n is 2-8;, X is O or S; and, R1 and R2 which may be the same or different are hydrogen or C1-C4 alkyl groups optionally substituted with mercapto.
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 September 10, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 10, 2002.
- 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.