Appeal No. 97-0455
Application No. 08/344,043
Borated Succinic Acid/Polyamine Dispersant/Detergent
Sulfurized Hydrocarbon Anti-wear Agent
Phenolic Anti-oxidant
Carboxylic Acid Anti-rust Agent
Product of Example 3
Silicone Anti-foam Agent
The “[p]roduct of Example 3" is the reaction product of a nitrophenol and an amino compound (polyamine).
Davis ‘757, 16:25-45. As can be seen from the above list, the lubricant contains no bright stock and is free
of ash-forming and phosphorous-containing ingredients.
Davis, 4,425,138
Davis, 4,425,138 (Davis ‘138) also relates to a lubricant similar to that disclosed in Davis ‘757.
The lubricant is taught to be useful in two-stroke cycle engines. Davis ‘138, 2:29-38. The patent also
teaches that
[i]n some two-cycle engines the lubricating oil may be injected into the combustion
chamber along with the fuel or into the fuel just prior to the time the fuel enters the
combustion chamber. The two-cycle lubricants of this invention are intended for
use in such two-cycle engines.
Davis ‘138, 18:53-58. The lubricants include an oil of lubricating viscosity (Davis ‘138, 3:1 to 4:19) and
an amino phenol (Davis ‘138, 4:45 to 11:33). The '138 lubricant may also include:
Other additives such as auxiliary detergents and dispersants of the ash-producing
or ashless type, anti-oxidants, coupling agents, pour point depressing agents,
extreme pressure agents, color stabilizers and anti-foam agents . . . . [Emphasis
added.]
Davis ‘138, 17:28-33. Ashless dispersants are specifically recommended for use in two- stroke cycle
engine lubricants. Davis ‘138 teaches:
Detergent-dispersants of ashless types and ash-producing metallic types are used
to control piston ring sticking and promote general engine cleanliness. The heavier
duty two-cycle lubricants require the use of suitable ashless dispersants because
of the proneness of the reference engine to deposit induced preignition. Other
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