Flotation deinking of wastepaper using a froth controlling agent
CA 2197348 C · Owner: Li, Chin · Inventors: Longhini, David A.; Li, Chin; Vijayendran, Bhima
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Describes flotation deinking of secondary fiber using a froth moderating agent, a composition of the froth moderating agent with flotation deinking chemicals, and reducing the amount of stickies in separated secondary fiber. The froth moderating agent is selected from the group consisting of: (a) nonionic surfactant material represented by the formula: R-C6H4O-(C2H4O)m- (C3H6O)n-(C4H8O)p-R1, wherein R is an aliphatic hydrocarbon group containing from about 5 to 20 carbon atoms, R1 is selected from the group consisting of chloro, C1-C3 alkyl, C1-C5 alkoxy and phenoxy m, n, and p are each a number , of between 0 and about 50 and the sum of m, n, and p is between about 1 and 50; (b) …
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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 August 10, 1995 and granted July 15, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 10, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 10, 2017.
- 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
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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.