Appeal 2007-0305
Application 10/067,186
DISCUSSION
“[T]he invention relates to . . . a disposable vacuum cleaner filtration
bag made from a composite sheet comprised of at least one [ ] layer of
expanded polytetrafl[uo]roethylene (ePTFE) and at least one substrate layer.
In . . . [one] embodiment of the invention, a composite sheet is formed into a
disposable vacuum cleaner filtration bag known as the ‘pillow case’” (Spec.
1: 5-9).
Claims 1 and 5 are representative of the claimed subject matter:
1. A disposable filtration bag for a floor care appliance,
comprising a closed receptacle for collecting dirt particles and having
an inlet opening for allowing a dirt laden airstream to enter, said
receptacle being formed from a composite sheet comprised of at least
one layer of expanded polytetrafl[uo]roethylene and at least one
substrate layer.
5. The filtration bag of claim 1, wherein said closed receptacle
further includes:
a front panel portion;
a rear panel portion comprised of a first rear panel portion and a
second rear panel portion joined together with a seam;
wherein said front panel portion and said rear panel portion
each respectively have a top end and a bottom end and said respective
top ends and said bottom ends are sealed together by folding and an
adhesive.
According to the Specification, ePTFE is “very fragile” and “must be
used in conjunction with at least one porous substrate layer . . . [which] is
stronger and much more durable than the ePTFE membrane layer(s) [ ]
making the resulting composite material [ ] suitable as a filtration media”
(Spec. 6: 22 to 7: 4).
2
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Last modified: September 9, 2013