Expansion folder with accordian-pleat backbone

Details Expansion folder with accordian-pleat backbone Expansion folder with accordian-pleat backbone

1979-12-13

1981-08-18

Marcus, Stephen

Envelopes, wrappers, and paperboard boxes

Paperboard box

Box material includes a coating or a nonpaperboard...

229DIG3, 229DIG4, 281 29, B65D 3700, B42F 702

Patent

active

042842271

ABSTRACT:
A backbone construction for a file folder including a pair of parallel grooves on the inside of the folder between the backbone portion and the front and rear leaves, slots extending inwardly from the ends of the backbone portion, a flexible tape overlying both the inner and outer surfaces of the backbone and the inner and outer surfaces of the front and rear covers adjacent to the grooves, an elongated slit located centrally between the grooves and parallel thereto and extending through the tape on the inner surface of the backbone and through a portion of the backbone and being in line with the slots, and perforations located between the ends of the slit and the slots.

REFERENCES:
patent: 643866 (1900-02-01), Burrows
patent: 1721344 (1929-07-01), Klopp
patent: 1745249 (1930-01-01), Doughty
patent: 1745461 (1930-02-01), Trussell
patent: 2109882 (1938-03-01), Gram
patent: 2289949 (1942-07-01), Wisdom
patent: 2486330 (1949-10-01), Schade
patent: 2693894 (1954-11-01), Elmendorf
patent: 2772427 (1956-12-01), Rankin
patent: 3087498 (1963-04-01), Vogel

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