Appeal No. 2006-1003
Application 10/046,535
Rejection over Lin in view of Hoyt and Segraves
Hoyt discloses that the acid dye staining of polyamides
including nylon 6, 12 can be reduced by chemically blocking a
portion of the polyamide’s amine end groups such that the
terminal amine group content preferably is less than 25 meq/kg
(col. 1, lines 34-41; col. 2, lines 22-35; col. 4, lines, 26-34;
col. 5, lines 15-42; col. 6, lines 38-47; col. 7, lines 3-18).
Like the appellants (specification, page 12, lines 17-18), Hoyt
blocks the amine end groups with lactones (col. 5, lines 15-42).
The appellants argue that because Lin does not ascribe any
significance to a low amine end group content of either the core
or the sheath, there is no suggestion for a person to go
searching for a sheath having a low amine end group content
(brief, page 8). Hoyt’s disclosure that blocking amine end
groups of a polyamide reduces staining (col. 6, lines 38-47)
would have fairly suggested, to one of ordinary skill in the art,
using a low amine end group content polyamide as Lin’s sheath to
obtain that benefit.
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