Time temperature indicator

Details Time temperature indicator Time temperature indicator

1974-01-21

1976-03-09

Queisser, Richard C.

Signals and indicators

Alarms

Fluid flow

23253TP, 58 1R, 1161145, 426 88, 426524, G01K 1100, G04F 100

Patent

active

039424677

ABSTRACT:
A system operable to signal the attainment of one or more preselected time-temperature integrals which monitor the temperature history of a product utilizes an organic compound which is subject to solvolysis with the generation of an acid, at least one base in an amount less than the stoichiometric equivalent of the acid generated, and a pH sensitive indicator.

REFERENCES:
patent: 2560537 (1951-07-01), Andersen
patent: 2567445 (1951-09-01), Parker
patent: 2809116 (1957-10-01), Laskowski
patent: 3046786 (1962-07-01), Tessem
patent: 3520124 (1970-07-01), Myers
patent: 3625655 (1971-12-01), Culp, Jr. et al.
patent: 3701633 (1972-10-01), Davis
patent: 3791794 (1974-02-01), Tomkin
patent: 3868218 (1975-02-01), Tornmarck et al.

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