D21D - Treatment of the materials before passing to the paper-making machine

More topics under "D21D - Treatment of the materials before passing to the paper-making machine" (7,540)
D21D 1 - Methods of beating or refining; Beaters of the hollander type (3,356)
D21D 5 - Purification of the pulp suspension by mechanical means; Apparatus therefor (4,157)
D21D 99 - Subject matter not provided for in other groups of this subclass (27)

Patents for D21D - Treatment of the materials before passing to the paper-making machine (115)
06/1986
06/10/1986	CA1205752A1 Absorbent in pulp process
04/1986
04/22/1986	CA1203407A1 System for washing pulp
04/08/1986	US4581254 Foam applicator used in paper treatment
10/1984
10/30/1984	CA1176838A1 Size press with coating pool suppressing arrangement
10/30/1984	CA1176835A1 Surface sizing and/or coating apparatus for paper web or similar
10/1983
10/04/1983	US4407227 Surface sizing and coating apparatus for a paper web of a paper machine
09/1983
09/13/1983	CA1153600A1 High speed size press
07/1983
07/05/1983	US4391217 Size press with coating pool suppressing arrangement
07/1982
07/20/1982	US4340623 And for coating paper
07/1981
07/14/1981	CA1104856A1 Pulp refining element
03/1981
03/17/1981	CA1097466A1 Process for the production of paper containing starch fibers and the paper produced thereby
02/1981
02/24/1981	CA1096113A1 Fluidized bed recovery of sodium carbonate from spent cooking liquor
06/1980
06/03/1980	CA1078644A1 Specific surface fractionator
01/1979
01/09/1979	CA1045865A1 Vented disc refiner
03/1976
03/02/1976	US3941902 Sizing

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