Time temperature integrating indicator
US4042336A · kind A · utility
45Cited by
3References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 22, 1975 |
| Grant date | Aug 16, 1977 |
| Priority date | — |
| Expiry date | Sep 22, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01K3/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The temperature history of a product is visually displayed as a color front on an indicator, the distance of front advancement being a function of the temperature time integral. The indicator measures the gas generation in a first compartment by a wick in a second compartment, the wick also being in communication with the first compartment. Optionally, a gas permeable film separates the gas generating material and the wick. The indicator is fine tuned for time temperature integral by incorporating into the wick a quantifier with which the gas generated reacts preferentially.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.