Deinking agent and method of deinking through flotation using the deinking agent
CA 2129223 C · Owner: Hirakouchi, Yoshie · Inventors: Hagiwara, Masaaki; Hirakouchi, Yoshie
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A deinking agent comprising a compound represented by the following general formula I is herein provided: R1O -(PO)m -(EO)n - (XO)k - R2 (I), (wherein R1 represents an alkyl or alkenyl group having 12 to 22 carbon atoms; R2 represents a hydrogen atom or an acyl group having 2 to 24 carbon atoms; PO, EO and XO represent a propylene oxide unit, an ethylene oxide unit and an alkylene oxide unit having not less than 3 cabon atoms, respectively; m = 1~8; n = ~40; and k is such a number that the number of total carbon atoms present in the polymerized XO unit ranges from 3 to 120; the PO and EO in Formula (I) being added through block-addition) ~ The use of the deinking agent in the deinking …
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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 February 10, 1994 and granted May 16, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 10, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 10, 2016.
- 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.