Plural intrinsic expiration initiation application indicators
US6787108B2 · kind B2 · utility
27Cited by
15References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 23, 2002 |
| Grant date | Sep 7, 2004 |
| Priority date | — |
| Expiry date | Aug 23, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N31/229
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for monitoring the expiration of goods includes a substrate and an unreacted composition affixed thereto which is intrinsically reactive to one or both of its thermal environment and the length of time following activation. The reactivity results in a color formation of the composition with the color formation being a single color upon reaction to one of said thermal environment or length of time and multiple colors upon reaction to both. The device may be a label affixed to a container containing the goods to be monitored or may be printed directly on a container.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.