Appeal No. 2002-0224
Application 08/628,327
fluorochemical compounds, however, are monomers which polymerize
to form copolymer or terpolymer fibers (page 1, line 79 - page 2,
line 8). The fluorochemical compounds are not additive compounds
within the fibers.
The examiner points out that Crater’s fluorochemical
oxazolidinones are among the appellants’ additives
(specification, page 6), and argues that the appellants’
specification (page 1) indicates that Crater’s polypropylene,
with which the fluorochemical oxazolidinones can be melt blended
(col. 8, lines 56-58; col. 9, lines 12-15), is an electret
material (answer, page 10). The appellants’ specification
discloses that polypropylene webs can be used as electret filter
media (page 1). The specification, however, also indicates that
an electret does not exist until the polypropylene is charged,
such as by AC and/or DC corona discharge (pages 1 and 3). Crater
teaches that his fluorochemical oxazolidinones provide fiber and
film substrates such as textiles, carpets, paper and leather with
low surface energy, oil and water repellancy, and anti-soil
properties (col. 2, lines 21-30; col. 8, lines 56-65; col. 9,
lines 16-22). The examiner has not explained how Crater would
have led one of ordinary skill in the art to charge his fibers to
form an electret.
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