System for preventing erasure of audio recordings

Details System for preventing erasure of audio recordings System for preventing erasure of audio recordings

1975-05-23

1976-09-07

Konick, Bernard

Dynamic magnetic information storage or retrieval

General recording or reproducing

Recording-or erasing-prevention

235 6111D, 360 2, 360105, G11B 1504, G11B 1904

Patent

active

039797708

ABSTRACT:
A system prevents erasure of audio material pre-recorded on a magnetic recording strip on a card or photograph. Erasure of any selected portion of the recording strip is prevented by securing material to the card or photograph to thicken the card or photograph along the length of the magnetic strip that is not to be erased. The thickened portion of the card cannot be inserted into or moved along a slot in a magnetic eraser, and the thickened portion of the card is detected in a recording machine for disabling the record mode of the recorder to prevent recording over the portion of the magnetic strip that should not be erased. The material thickening the card is preferably secured to the face of the card opposite the face bearing the magnetic strip.

REFERENCES:
patent: 3641277 (1972-02-01), Campbell
patent: 3755641 (1973-08-01), Rackman
patent: 3777074 (1973-12-01), Olmsted
patent: 3860961 (1975-01-01), Budrose
patent: 3869718 (1975-03-01), Schmidt

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