Appeal No. 2000-1447
Application No. 08/987,404
from 10 wt.% to 30 wt.% based on the whole weight of the
base stock of an ester having a kinematic viscosity of from 8 cSt
to 35 cSt at 100°C and a saponification value of 200 mg-KOH/g or
lower; and
from 90 wt.% to 70 wt.% based on the whole weight of the
base stock of a poly("-olefin) and/or a highly-refined mineral
oil having a sulfur content of 5 ppm or lower and an aromatic
hydrocarbon content of 1 wt.% or less.
The examiner relies upon the following references as
evidence of obviousness:
Seiki 4,968,452 Nov. 6, 1990
Culpon, Jr. (Culpon) 5,151,205 Sep. 29, 1992
Arai et al. (Arai) 5,364,545 Nov. 15, 1994
Appellants' claimed invention is directed to a lubricating
oil for internal combustion engines comprising a base stock
containing a poly("-olefin) and/or highly-refined mineral oil
and an ester having the recited kinematic viscosity and saponi-
fication values. According to appellants, molybdenum-containing
oils, like those of the present invention, show extremely low
friction reducing effects when combined with ester-blended base
stocks (page 2 of specification, second paragraph). According to
appellants, they have found that use of an ester having the
claimed kinematic viscosity and saponification values "makes it
possible to fully exhibit the performance of a molybdenum-based
friction modifier" in a lubricating oil for internal combustion
engines (page 5 of specification, second paragraph). Appellants
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