Appeal No. 2000-1782
Application No. 08/933,639
claims 5, 9, 14 and 19 requiring the vent to be a sintered
macroporous plastic.
Saigne discloses a closure cap for a tank containing
hydrocarbon, propane or like liquid. The cap includes a
filter element providing a venting passage for maintaining the
correct pressure within the tank. The filter element, which
may be made of a sintered metal, a compressed plastic foam, or
a sintered plastic (see column 2, lines 42 through 61; and
column 6, lines 44 through 62), has a porosity allowing the
passage of air, but not liquid or any other particle having a
size greater than or equal to one micron.
Bright discloses a microporous structure having general
utility in the field of industrial filtration (see column 1,
lines 10 through 28). The structure comprises a macroporous,
synthetic resin substrate 11 having pores greater than 10
microns in diameter and a microporous, synthetic resin matrix
13 cast within the macroporous structure 11 and having pores
less than 10 microns in diameter. Bright teaches that the
macroporous substrate 11 is formed by sintering particles of
powdered synthetic resin material (see column 2, lines 25
through 32).
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