Appeal No. 2006-0466
Application No. 10/175,787
for packaging materials inclusive of the envelope of the type
discussed in Strzelewicz, teaches (column 2, lines 46-66):
Particularly well suited for outer layers 12
and 16 of composite sheet 10 are sheets of
spunbonded nonwoven polyolefin film-fibrils of the
type disclosed in U.S. Pat. No. 3,169,899 or
vapor-permeable fabric sheets of the type
disclosed in U.S. Pat. 4,684,568, the contents of
which are both incorporated by reference herein.
Polyethylene and polypropylene are the polyolefins
of choice. A commercial spunbonded nonwoven
polyethylene film-fibril sheet product that is
particularly suitable to the composite sheet of
the invention is TYVEKŪ spunbonded polyolefin
sheet sold by E. L du Pont de Nemours and Company
of Wilmington, Del. TYVEKŪ is a registered
trademark of DuPont. TYVEKŪ spunbonded polyolefin
sheets are flexible, lightweight, strong and vapor
permeable. TYVEKŪ sheets also have a very low
abrasiveness and they are inert to most painted
surfaces. Another vapor permeable sheet material
suitable for outer layers 12 and 16 of the
composite sheet of the invention is a
spunbonded/meltblown/meltblown/spunbonded (“SMMS”)
polypropylene sheet material, as for example
Evolution sheet material sold by Kimerly-Clark
Corporation of Neenah, Wis. (Emphasis added.)
Given the above teachings, we concur with the examiner that
one of ordinary skill in the art would have been led to employ
either polyethylene or polypropylene as part of the outer layer
of the envelope of the type discussed in Strzelewicz, with a
reasonable expectation of successfully making the useful cushion
shipping bag or envelope taught by Strzelewicz.
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