Unerasable electronic programmable read only memory (UPROM.TM.)

Details Unerasable electronic programmable read only memory (UPROM.TM.) Unerasable electronic programmable read only memory (UPROM.TM.)

1993-11-05

1996-06-11

Crane, Sara W.

Active solid-state devices (e.g., transistors, solid-state diode

Responsive to non-electrical signal

Electromagnetic or particle radiation

257758, H01L 310232

Patent

active

055258271

ABSTRACT:
A shielded electronically programmable read only memory (UPROM.TM.) having memory cells enclosed in a shield structure which protects the content of the memory cells from erasure UV rays is described. In addition to protecting the memory cells, the UPROM provides for accessing the cells from all sides of the shield structure without compromising its protective function. In one embodiment of the present invention, a UPROM having a two dimensional array of EPROM cells is described.

REFERENCES:
patent: 3728695 (1973-04-01), Frohman-Bentchkowsky
patent: 3744036 (1973-07-01), Frohman-Bentchkowsky
patent: 3792319 (1974-02-01), Tsang
patent: 3996657 (1976-12-01), Simko et al.
patent: 4250570 (1981-02-01), Tsang et al.
patent: 4519050 (1985-05-01), Folmsbee
patent: 4530074 (1985-06-01), Folsmbee
patent: 4942450 (1990-07-01), Iwashita

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