File stiffener

Details File stiffener File stiffener

1997-02-11

1999-04-27

Fridie, Jr., Willmon

Books, strips, and leaves

Book, element thereof, or accessory therefor

Protectors

281 28, B42D 100

Patent

active

058971416

ABSTRACT:
The invention relates to a file stiffener for stiffening a file of the type having a pair of opposed covers hinged to and spaced apart from one another by a spine, in particular for ring binder and lever arch-type files. The file stiffener comprises at least one rigidifying spacer element, and mounting means for mounting the spacer element between the opposed covers, the spacer element being dimensioned to hold the covers apart in a rigid parallel configuration.

REFERENCES:
patent: 4569613 (1986-02-01), Thomas
patent: 4997207 (1991-03-01), Feldman
patent: 5069567 (1991-12-01), Fink et al.
patent: 5590909 (1997-01-01), Urban et al.
patent: 5634666 (1997-06-01), Lee
Jacobs Gardner Office Supply Catalog, p. 873, item "B", Dec. 1990.

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