Method of forming a tube

Details Method of forming a tube Method of forming a tube

2005-04-19

2005-04-19

Brinson, Patrick (Department: 3754)

Pipes and tubular conduits

Longitudinally seamed

With tongue in slot

C138S156000, C138S167000, C138S168000, C029S513000, C029S521000

Reexamination Certificate

active

06880581

ABSTRACT:
A method of forming a tube involves the punching of tabs from overlapping longitudinal seam and folding the tabs to mechanically fix the opposed lateral edges of the sheet material forming the tube.

REFERENCES:
patent: 518767 (1894-04-01), Plecker
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patent: 3728881 (1973-04-01), Coop
patent: 3824757 (1974-07-01), Coop
patent: 4490422 (1984-12-01), Pascher
patent: 4734971 (1988-04-01), Dupasquier
patent: 5357667 (1994-10-01), Schutz
patent: 197 49 728 (1997-04-01), None
patent: 0 715 910 (1995-11-01), None

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