Appeal No. 95-2270
Application 08/005,856
This appeal is from a decision of the Primary Examiner
rejecting claims 45-54 as being unpatentable under 35 U.S.C.
§ 103 over the prior art. We reverse.
A. Findings of fact
Prior art polysiloxane pressure-sensitive adhesives
1. Pressure-sensitive adhesives based on
organopolysiloxane compositions are known. See Goodwin, U.S.
Patent Nš 2,857,356, issued October 21, 1958.
2. According to Goodwin, the compositions are made by
"intercondensing [i.e., reacting,] a mixture of ingredients"
(col. 2, lines 23-24) comprising (a) a "resin" and (b) a "fluid."
3. The "resin" is a cohydrolysis product of:
(i) a trialkyl hydrolyzable silane, having the
formula:
R SiX
3
where X can be, e.g., an alkoxy radical
(col. 2, lines 31-44) and
(ii) an alkyl silicate having the formula:
(RO) Si
4
where R is a lower alkyl radical, such a
methyl or ethyl (col. 2, lines 45-56).
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