Appeal No. 2006-0415
Application No. 10/267,200
1 containing species would appear to have been a matter of routine
2 risk reduction to select a less toxic alternative, especially in
3 view of De Keyser’s express teaching to avoid poisoning the
4 worker.
5 b)Viscosity of 1K – 10K cps for 20 Minutes at 40°C
6 The appellant urges that the De Keyser reference fails to
7 meet the limitation of selecting the reactants so as to maintain
8 the viscosity of the adhesive formulation for at least 20 minutes
9 after mixing within the range of 1,000 to 10,000 cps at 40°C.
10 (Appeal Brief, page 6, line 18- page 7, line 26). The thrust of
11 this argument is that the selection of the resin and curative in
12 De Keyser for “low viscosity” fails to give weight to the claim
13 limitations including a duration. (Appeal Brief, page 7, lines
14 14-15).
15 We are not persuaded by this contention.
16 The prior art of record teaches the difficulty of spreading a
17 layer of adhesive thinly (De Keyser, column 2, lines 25-32). Low
18 initial viscosity is desirable in order to achieve this thin
19 spreading. (Id., col. 2, lines 21-25). The prior art of record
20 also teaches that the active life of an adhesive in its ready form
21 is limited by the reactivity of its components (Id., column 1,
22 lines 64-66).
23
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