Appeal No. 2001-1375
Application 09/204,609
1. A process for preparing a cellulose carbamate solution,
the process comprising
(a) preparing an 8% to 15% cellulose carbamate solution
with a sodium hydroxide concentration of 7% to 12% by
dissolving cellulose carbamate in a sodium hydroxide solution at
a temperature of less than 10EC, and
(b) adjusting the sodium hydroxide concentration of the
cellulose carbamate solution to a concentration that is less
than the concentration in a) and less than 9% by adding to
the cellulose carbamate solution either
(i) a single diluent comprising a dilute sodium
hydroxide solution or water, or
(ii) a first diluent followed by a second diluent,
wherein one of said diluents is water and the other is
a dilute sodium hydroxide solution,
provided that the weight ratio of cellulose carbamate to sodium
hydroxide in both (a) and (b) is greater than 1.
The references relied upon by the examiner are:
Selin et al. (Selin) 4,526,620 Jul. 2, 1985
Turunen et al. (Turunen) 4,639,515 Jan. 27, 1987
GROUNDS OF REJECTION
1. Claims 1-7 stand rejected under 35 U.S.C. § 103 as
unpatentable over Turunen.
Page: Previous 1 2 3 4 5 6 7 8 9 10 Next
Last modified: November 3, 2007