Separation of cellulosic and non-cellulosic fractions from paper products
CA 2207963 C · Owner: Conway, Marlene Elizabeth · Inventors: Martin, Scott Anthony; Conway, Marlene Elizabeth
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process (1) for the separation of cellulosic fibres from non-cellulosic fractions in paper product is disclosed. The paper product comprises cellulosic fibres and at least one of thermoplastic polymer and metallic foil. The process (1) comprises vigorously admixing paper product in aqueous solution (3) in a vessel (2), the paper product being in a comminuted form and the vessel (2) being such that the solution (3) has a surface (11) within the vessel (2). The admixing is such that it is effective for at least partial separation of cellulosic fibres from thermoplastic polymer and metallic foil and to form a suspension of cellulosic fibres so separated in the aqueous solution (3). …
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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 December 15, 1995 and granted June 1, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 15, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 15, 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
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.