Appeal No. 97-3776
Application No. 08/396,501
This is an appeal from the final rejection of claims 1-
14, all the claims in the present application. Claim 1 is
illustrative:
1. A crankcase lubricant having a sulfated ash content
between 0.35 and 2 mass percent comprising a major amount of
an oil of lubricating viscosity to which the following
components have been added:
A) a nitrogenous TBN source selected from the group
consisting of ashless nitrogen containing dispersants, ashless
nitrogen containing dispersant viscosity modifiers, oil
soluble aliphatic, oxyalkyl, or arylalkyl amines and mixtures
thereof wherein said nitrogen containing dispersant is
selected from the group consisting of oil soluble salts,
amides, imides, amino-esters, and oxazolines of long chain
hydrocarbon substituted mono and dicarboxylic acids or their
anhydrides; long chain aliphatic hydrocarbons having a
polyamine attached directly thereto; and Mannich condensation
products formed by condensing a long chain substituted phenol
with formaldehyde and polyalkylene polyamine wherein the long
chain hydrocarbon has an Mû of 300 to 20,000;
B) a metal salt of an oil soluble acid having a TBN in
excess of 100;
C) a magnesium salt of an oil soluble organic acid in an
amount providing at least 500 ppm (mass) magnesium, and
D) at least one metal dihydrocarbyl dithiophosphate
wherein the nitrogenous TBN source provides at least about 1.5
TBN to the lubricant; the metal salt of an oil soluble acid
provides at least about 40% of the total TBN of the lubricant;
and at least 50 mole percent of the hydrocarbyl groups on the
metal dithiophosphate are secondary.
The examiner relies upon the following references as
evidence of obviousness:
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