Appeal 2007-1483
Application 10/344,390
and passenger car diesel oils, for spark-ignited and compression-ignited
engines. Waddoups at 9:20-23.
4. Lesieur
Lesieur discloses a system for desulfurizing a gasoline supply.
Lesieur at 1:8-11.
The desulfurizing system reduces sulfur contaminants found in fuel to
levels that reduce internal combustion engine corrosion. Lesieur at 1:11-15.
The disclosed system can lower the amount of sulfur in a fuel stream
to less than about 0.05 parts per million, a level which will not significantly
damage the components of an internal combustion engine. Lesieur at 3:45-
51.
5. Welstand
Welstand discloses an unleaded gasoline fuel that is substantially free
of oxygenates and has a sulfur content of less than 30 ppmw, more
preferably less than 20 ppmw, even more preferably less than 15 ppmw, and
most preferably about 10 ppmw or less. Welstand at 7:66-8:5.
Example 2 describes a fuel having a sulfur content of 5 ppmw. Table
3, Fuel I.
The disclosed gasoline fuel is said to offer substantially oxygenate
free gasoline which avoids the environmental impact of oxygenates, yet
when combusted in an internal combustion automobile engine provides good
performance and good emissions. Welstand at 3:11-15.
Generally, the lower the sulfur content, the more magnified the
beneficial effects observed. Welstand at 9:21-22.
According to Welstand, the disclosed gasoline fuel compositions are
applicable to all gasoline fueled cars. Welstand at 8:37-39.
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