Appeal No. 97-0455
Application No. 08/344,043
themselves are, of course, the conventional steps for lubricating a typical internal combustion engine. The
lubricants specified in claim 21 differ from the lubricants of claim 1 in that there is no limitation placed upon
the amount of bright stock. However, dependent claims 35 and 36 limit the amount of bright stock. Claim
35 limits it to 0 to about 3%. Claim 36 requires that the lubricant be free of bright stock.
Claims 1, 41, 21, 35 and 36 are reproduced below:
1. A lubricant composition suitable for fuel injected two-stroke cycle engines,
comprising:
at least one oil of lubricating viscosity;
an amount, sufficient to reduce or prevent piston scuffing, of a
mixture of
(A) at least one phenol selected from
(A-1) an aminophenol and
(A-2) a reaction product of a nitrophenol and an
amino compound; and
(B) at least one Mannich dispersant, amine
dispersant, nitrogen-containing carboxylic
dispersant, or ester dispersant;
said composition further comprising:
(C) an amount, sufficient to reduce degradation of the
lubricant composition upon exposure to oxygen or to
oxides of nitrogen, of a nitrogen-containing inhibitor, a
hindered phenol inhibitor, or a sulfur-containing organic
inhibitor;
said composition containing 0 to about 3 percent by weight bright
stock;
provided said composition is substantially free from ash-forming
components and from added phosphorus-containing components.
41. A lubricant composition suitable for fuel injected two-stroke cycle engines,
comprising:
at least one oil of lubricating viscosity;
an amount, sufficient to reduce or prevent piston scuffing, of a
mixture of
(A) at least one aminophenol and
-3-
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