Appeal 2007-1905
Reissue Application 10/931,249
Patent 6,444,720 B1
1 Okada
2 Okada describes an open-cell rigid polyurethane foam which is
3 similar to the open-cell rigid polyurethane described and claimed by Bayer.
4 The Okada polyurethane foams are made by reacting a polyisocyanate
5 with a mixture of polyols. Page 2:48 through page 3:11.
6 Okada is silent on the carbon-carbon double bond content of its
7 polyols.
8 Okada differs from the foam claimed by Bayer in that Okada does not
9 describe the use of a polyol which contains no more than 15 mmole.kg-1 of
10 carbon-carbon double bonds.
11 In describing the background of its invention, Okada reveals that [a]
12 rigid polyurethane foam has an excellent moldability and processability, and
13 is in wide use as a heat insulating material, structural material or shock
14 absorbing material. Page 2:8-9; page 3:32-36.
15 The open-cell rigid polyurethane foams of Okada are said to have a
16 closed cell content of not more than 10%. Page 3:15-16.
17 An open-cell rigid polyurethane which has a closed-cell content of
18 10% would have an open-cell content of 90%. Appeal Br. 5, first full
19 paragraph, last line.
20 Okada prefers the use of a tertiary amine catalyst. Page 6:23-24.
21 Okada describes foams said to have been made according to its
22 invention and reports closed cell contents of 2, 3, 0, 3, 5 and 2%. See
23 Examples 1-6. Page 10.
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Last modified: September 9, 2013