Appeal No. 95-0944
Application 07/748,730
The subject matter on appeal is directed to a process for
preparing high temperature, stable lubricant fluids or additives
by reacting an olefin with diphenyl disulfide to form a
monoalkylated thiophenol.
Appellant acknowledges that all the claims stand or fall
together. Independent claim 33 reads as follows:
33. A process for the preparation of a high-temperature
stable lubricant fluid or lubricant additive comprising reacting
(1) an olefinic hydrocarbon containing from 3 to about 500
carbons and optionally containing S, N, O, P, F, and (2) a
diphenyl disulfide in the presence of a zeolite catalyst thereby
forming a monoalkylated thiophenol wherein the reaction
temperature varies from ambient to about 350E C, the molar ratio
of olefinic hydrocarbon to diphenyl disulfide varies from 1:1 to
about 10:1 and the amount of catalyst varies from 5 to about 100
grams of catalyst to about 1 mole of diphenyl disulfide.
The reference relied upon by the Examiner is:
Forbus et al. (Forbus) 5,171,915 Dec. 15, 1992
Claims 33, 36, 37, and 40 to 43 stand rejected under
35 U.S.C. § 103 as being unpatentable over Forbus.
We cannot sustain this rejection.
The claims at bar are directed to a process of reacting an
olefinic hydrocarbon with diphenyl disulfide to form a
monoalkylated thiophenol. Although Forbus discloses a similar
process for preparing alkylated aromatics, he does not disclose
diphenyl disulfide as a reactant. Forbus only discloses diphenyl
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