Method of manufacturing a bellows

Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Plural sequential shaping or molding steps on same workpiece

Reexamination Certificate

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Reexamination Certificate

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07025922

ABSTRACT:
A method of manufacturing a plastics material bellows, wherein a preform is made by molding plastics material in a mold, the mold having preferred deformation zones, and then before the part has completely left the mold, the bellows is formed by folding the preform in the preferred deformation zones, with the resulting bellows being open at both ends.

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patent: 5088580 (1992-02-01), Grothe et al.
patent: 5490966 (1996-02-01), Peterson et al.
patent: 5851476 (1998-12-01), Wydra et al.
patent: 6042360 (2000-03-01), Padovani
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patent: 0 972 624 (2000-01-01), None
patent: 61 228942 (1986-10-01), None
patent: 63 237933 (1988-10-01), None
patent: 3 268919 (1991-11-01), None
French Search Report dated Apr. 5, 2001 and referenced which are copied herein.

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