Appeal No. 95-4846
Application 08/023,592
amendment dated April 10, 1995 (Paper No. 11) was entered by the
examiner and obviates the final rejection of claims 14 through 16
under 35 U.S.C. § 112, second paragraph (see the Examiner
Interview Summary Record dated May 30, 1995 (Paper No. 15) and
the Advisory Action dated May 30, 1995 (Paper No. 16)).
According to appellant, the invention is directed to a
method of manufacturing a mixing impeller by introducing
polyurethane resin into a mold at different times to form an
impeller that has a soft outer portion chemically bonded to a
stiffer inner portion (brief, pages 2-3). Claim 14 is
illustrative of the subject matter on appeal and is reproduced
below:
14. A method of making an impeller having inner and outer
portions of polyurethane resin having different flexibilities,
the outer portion being bonded to the inner portion, the outer
portion having greater flexibility than the inner portion,
comprising the steps of:
(a) rotating a centrifugal casting mold containing at an
outer portion of the mold a first polyurethane resin forming
material of predetermined composition,
(b) introducing into an inner portion of said mold a second
polyurethane resin forming material of different composition than
the first polyurethane resin forming material at said outer
portion,
(c) centrifugally casting the first and second polyurethane
resin forming materials respectively to form inner and outer
portions of said impeller, and
2
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