Dual purpose file

Details Dual purpose file Dual purpose file

1991-10-25

1993-05-25

Bell, Paul A.

Binder device releasably engaging aperture or notch of sheet

Pliant, deformable sheet retainer

Secured by folded portion thereof

402 73, 402 80R, 402502, 281 29, B42F 1306

Patent

active

052134334

ABSTRACT:
A cardboard blank has a plurality of fold lines dividing the blank into section for folding into a loose leaf folder or a box file. The fold lines define two cover sections between which there is a spine portion having multiple spine fold lines defining a binding zone which can be formed as a double thickness ridge to which papers can be attached. The fold lines additionally define various flaps which can be folded flat onto the cover portions to form a loose leaf file or which can extend to form a box shape with the cover portions and spine portion.

REFERENCES:
patent: 2289949 (1942-07-01), Wisdom
patent: 4229022 (1980-10-01), Grundell
patent: 4437781 (1984-03-01), Weihe et al.
patent: 4632586 (1980-12-01), Erickson
patent: 4869613 (1989-09-01), Corey
patent: 5028160 (1991-07-01), Callander
patent: 5069567 (1991-12-01), Fink et al.

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