Fabrication and assembly structures and methods for memory...

Semiconductor device manufacturing: process – Bonding of plural semiconductor substrates – Warping of semiconductor substrate

Reexamination Certificate

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C257S724000

Reexamination Certificate

active

11080284

ABSTRACT:
The present invention provides for a common substrate with multiple sections, each constituting a separate layer of a memory device. Fold lines are arranged on the substrate to define separate sections and to provide a means for folding the sections on each other to form a multiple-layer memory device. In one application, a substrate has a fold line formed by alterations to the substrate material to form a fold line on the substrate. A first conductor section is formed with an array of parallel conductors or wires spaced across the section. A second section on the common substrate has an array of parallel conductors or wires spaced across the second section, the conductors being perpendicular to the conductors on the first section. The first and second sections are folded along the fold line over on top of each other, after a semiconductor layer has been deposited on one or both of the conductor layers, thereby forming a matrix of memory cells. The fold line is formed by removal of some of the material, such as by perforations or depressions, by deforming the material, such as by creasing, or by altering a property of the material, such as by changing the strength or flexibility of the substrate material.The conductors or the first section may also be fabricated with narrowing cross-section areas at points where fuses are to be set to an open circuit.

REFERENCES:
patent: 5776797 (1998-07-01), Nicewarner et al.
patent: 6007888 (1999-12-01), Kime
patent: 6055180 (2000-04-01), Gudesen et al.
patent: 6121676 (2000-09-01), Solberg

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