Ex Parte Cheng - Page 7
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Figure 1 of Simonetti is reproduced below:
4) Simonetti Figure 1 illustrates a dual-leaf spiral wound filter element.
The unfiltered feed flow 1 may enter the filter
element from one end . . . along the desired flow
path shown. . . . The permeate 3 may exit the filter
element through the permeate outlet tube 6 around
which envelopes incorporating the filter membrane
(5a, 5b) and backing material (7a, 7b) may be
wrapped. For outlying filter membrane envelopes,
the permeate may be transported to the permeate
outlet tube 6 by the fabric sheet 9 to which the
backing material (7a, 7b) . . . is adhered. .
5) Simonetti teaches that an envelope is created “by folding a composite
sheet of filter membrane (5a, 5b) and backing material (7a, 7b)
around the feed spacer material 8.” .
6) A crease is formed at the fold in the membrane, when it is folded to
make the envelope. See  and claim 54.
7) Simonetti discloses applying an adhesive 4, such as a polyurethane or
an epoxy along a “glue line” which generally runs along the portions
of the fabric sheet 9 and backing material (7a, 7b) near the feed inlet
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Last modified: November 3, 2007