Appeal 97-1554
Application 08/495,593
22. Rath describes gasoline fuels which contain
small amount of polyetheramine Component B.
23. Polyetheramines are known fuel additives for
cleaning carburetors, injectors and valves (col. 1, lines 16-
18).
24. Rath also reveals that fuels with
polyetheramines may also contain polybuteneamines as
carburetor, injector and valve detergents (col. 5, lines 58-
62).
The examiner's rationale
25. The examiner held that the claimed subject
matter would have been obvious in light of Kummer and Rath.
26. The examiner found that the prior art reveals
the use of Component A-type and Component B-type materials to
improve valve-cleaning in internal combustion engines.
27. Given that Rath describes the use of
polyetheramines in fuels as fuel additives for cleaning
various engine parts and further reveals that polybuteneamines
may also be added, the examiner reasoned that it would have
been obvious to also use the polyisobutylamines of Kummer in
the Rath fuels.
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