Security printer/copier

Details Security printer/copier Security printer/copier

1988-04-28

1990-01-16

Moffitt, James W.

Static information storage and retrieval

Read/write circuit

Data refresh

G11C 700

Patent

active

048948055

ABSTRACT:
A printer/copier which stores job image data in memory before reproduction has a "refresh period" after which data stored therein will degrade if the device is not refreshed. Upon completion of a "security" job, DRAM refresh and normal read or write operations are disabled for a time period sufficient to allow the data resident in the DRAM to degrade.

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Patent Abstracts of Japan, vol. 8, No. 163 (P-290) (1600), Jul. 27, 1984 & JP, A, 5958691 (Fujitsu K.K.), Apr. 4, 1984, see abstract.
Patent Abstracts of Japan, vol. 6, No. 133 (P-129) (1011), Jul. 20, 1982 & JP, A, 5757365 (Canon K.K.), Apr. 6, 1982, see abstract.
Patent Abstracts of Japan, vol. 10, No. 111 (P-451) (2168), Apr. 25, 1986 & JP, A, 60242589 (Nippon Denki K.K.), Dec. 2, 1985, see abstract.
IBM Technical Disclosure Bulletin, vol. 18, No. 5, Oct. 1975, F. J. Aichelmann et al.: "Memory Initialization by Deferred Refresh", p. 1457, see p. 1457, lines 1-7.

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