Pipes and tubular conduits – Flexible – Corrugated
Reexamination Certificate
2006-12-12
2006-12-12
Hook, James (Department: 3754)
Pipes and tubular conduits
Flexible
Corrugated
C138SDIG011, C138S119000, C138S122000
Reexamination Certificate
active
07147007
ABSTRACT:
This invention relates to a flexible tube that includes a bellows having a plurality of convolutes formed in the wall of said tube and extending above the top surface of the tube, said convolutes being spaced from one another in the axial direction of the tube, wherein at least one of said convolutes comprises two opposing bending sections and two restrained elongation sections positioned between the bending sections, and wherein the height of the bending sections above the top surface of the tube is greater that the height of the restrained elongation sections above the top surface of the tube.
REFERENCES:
patent: 2143960 (1939-01-01), Stalter et al.
patent: 3578777 (1971-05-01), DeGain
patent: 3605817 (1971-09-01), Bauman et al.
patent: 3715454 (1973-02-01), Kleykamp
patent: 3855799 (1974-12-01), Martin et al.
patent: 5439035 (1995-08-01), Dal Palu e, acu uAttilio
patent: 5564472 (1996-10-01), Gipperich
patent: 5706864 (1998-01-01), Pfleger
patent: 5792532 (1998-08-01), Pfleger
patent: 6021816 (2000-02-01), Jeltsch et al.
patent: 6056018 (2000-05-01), Renaud
patent: 6079451 (2000-06-01), Hegler
patent: 6123113 (2000-09-01), Pontbriand et al.
patent: 863 351 (2001-04-01), None
patent: WO99/22171 (1999-05-01), None
E. I. du Pont de Nemours and Company
Hook James
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