Deinking chemicals
CA 2134079 A1 · Owner: Henkel Corporation · Inventors: Rodriguez, Jose M.; Howell, Gail M.; Cook, Anthony B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Wastepaper containing printing ink is refined in the presence of the reaction products of epoxidized derivatives of C10-C22 carboxylic acids with alkoxylated polyhydroxy alcohols and the detached printing ink particles are subsequently removed from the paper stock suspensions by flotation or washing.
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 23, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 23, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 23, 2014.
- 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.