Deinking agent for recycling printed waste papers
CA 2040641 C · Owner: Hamada, Masao · Inventors: Hamada, Masao; Kawamori, Yukiyoshi; Monno, Susumu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a deinking agent used in recycling printed waste papers, e.g. newspapers magazines, leaflets and the like, mainly containing one or more additives selected from the group comprising (a) additives made by adding one or more selected from alkylene oxides to at least one selected from dimer acids and polymer acids of higher unsaturated fatty acids having a carbon number of 16~20; (b) additives made by adding one or more selected from alkylene oxides to at least one selected from partial esters which are made of an alcohol having a carbon number of 1~18 and dimer acids and polymer acids of higher unsaturated fatty acids having a carbon number of 16~20; (c) …
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
- Filed April 17, 1991 and granted August 26, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 17, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 17, 2013.
- 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.