Rectangular-faced enclosures

Details Rectangular-faced enclosures Rectangular-faced enclosures

1997-01-14

2000-05-02

Pascua, Jes F.

Envelopes, wrappers, and paperboard boxes

Envelope

Blanks

229 921, B65D 2700

Patent

active

060561920

ABSTRACT:
An improvement in the making of a rectangular envelope by folding adjoining triangular corner flaps on a rectangular sheet, and also in the resulting envelopes themselves and the blank sheets from which they are made, whereby certain sheet edge sections on each pair of adjoining triangular flaps become exactly aligned and partially coincident and an overlap of the last-folded closure flap is of uniform width throughout its length, all by application of particular mathematical formulae.

REFERENCES:
patent: 284297 (1883-09-01), Hartwell
patent: 665796 (1901-01-01), Myers
patent: 941525 (1909-11-01), Landenberger
patent: 1035109 (1912-08-01), Wasmus
patent: 2005493 (1935-06-01), Blackwell
patent: 2021620 (1935-11-01), Weir
patent: 4744509 (1988-05-01), Buchler
patent: 5279456 (1994-01-01), Bernstein

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