Ring binder

Details Ring binder Ring binder

1976-02-27

1977-04-26

Schnall, Jerome

Binder device releasably engaging aperture or notch of sheet

Depository

Face member with back member

281 29, 402 80R, B42F 1300

Patent

active

040198235

ABSTRACT:
A ring binder has a ring mechanism on the inside of the binder spine and two boards covering the inside surfaces of the binder covers which are hinged to the spine, the boards forming extensions which extend the covers inwardly close to the rings when the binder is open to provide flat writing supports, and the binder has straps interconnecting the covers and supporting the extensions which extend the covers inwardly.

REFERENCES:
patent: 90052 (1869-05-01), Saurman
patent: 1290907 (1919-01-01), Cardy
patent: 1724407 (1929-08-01), Lotter
patent: 2251614 (1941-08-01), Martin

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