Method of deinking printed waste cellulosic stock
CA 1074967 A · Owner: Basf Wyandotte Corporation · Inventors: Parker, Edward T.; Inks, Clyde G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
of the Invention, Printed waste cellulosic stock can be efficiently deinked by pulping the stock in the presence of based on the weight of the stock from 0.5% to 2% by weight of an alkali metal hydroxide and from 0.3% to 0.7% by weight of certain anionic surfactants.
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 8, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 8, 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.