Process for aerating dispersions

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Waste paper or textile waste

Reexamination Certificate

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C162S055000, C162S057000, C209S170000, C210S221100, C210S221200

Reexamination Certificate



A device and process for aerating dispersions, particularly for flotation of pulp suspensions, in a de-inking process where the pulp suspension containing dirt particles is sprayed into a tank together with air. The air is injected at a minimum of two successive points and mixed with the suspension.

patent: 4331534 (1982-05-01), Barnscheidt
patent: 4347128 (1982-08-01), Barnscheidt
patent: 4447157 (1984-05-01), Underwood
patent: 4704204 (1987-11-01), Kaelin
patent: 4722784 (1988-02-01), Barnscheidt
patent: 4738541 (1988-04-01), Weber
patent: 4842777 (1989-06-01), Lamort
patent: 5465848 (1995-11-01), Veh et al.
patent: 5762416 (1998-06-01), LeSire
patent: 5911703 (1999-06-01), Slate et al.
patent: 6217761 (2001-04-01), Catanzaro et al.
patent: 6475337 (2002-11-01), Gabl et al.
patent: 040 48921 (1992-02-01), None


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