Temperature/humidity indicator for a floppy disk cassette

Details Temperature/humidity indicator for a floppy disk cassette Temperature/humidity indicator for a floppy disk cassette

1987-11-17

1989-08-22

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Record medium

In container

G11B 2303

Patent

active

048601438

ABSTRACT:
An environmental indicator assembly in a floppy disk cassette provides a warning signal when the cassette has been subjected to either a high-moisture or a high-temperature condition either environment being potentially harmful to the disk. The indicator assembly includes a wax which melts in a high-temperature environment and a hygroscopic salt which breaks down in a high-moisture condition. If either the wax or the salt changes from a solid form, a warning flag automatically moves into a position viewable to a cassette user.

REFERENCES:
patent: 2446361 (1948-08-01), Clibbon
patent: 4590532 (1986-05-01), Saito

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