Paper making and fiber liberation – Processes and products – Non-fiber additive
Reexamination Certificate
2006-10-02
2009-10-20
Halpern, Mark (Department: 1791)
Paper making and fiber liberation
Processes and products
Non-fiber additive
C162S157200, C162S009000, C162S078000, C525S054300, C524S013000
Reexamination Certificate
active
07604714
ABSTRACT:
Methods for making substantially water-insoluble, water-swellable, non-regenerated, carboxyalkyl cellulose fibers, wherein the fibers have a surface having the appearance of the surface of a cellulose fiber, and wherein the fibers include a plurality of non-permanent intra-fiber metal crosslinks and a plurality of permanent intra-fiber crosslinks.
REFERENCES:
patent: 5137537 (1992-08-01), Herron et al.
patent: 5183707 (1993-02-01), Herron et al.
patent: 5190563 (1993-03-01), Herron et al.
patent: 5550189 (1996-08-01), Qin et al.
patent: 5998511 (1999-12-01), Westland et al.
Luo Mengkui
Qin Jian
Weerawarna S. Ananda
Wiley James H
Crawford John M.
Halpern Mark
Weyerhaeuser NR Company
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