Time-temperature integrating indicator
US3996007A · kind A · utility
24Cited by
4References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 29, 1975 |
| Grant date | Dec 7, 1976 |
| Priority date | — |
| Expiry date | Oct 29, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N31/229
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A pouch for containing the gas generating means in a Time-Temperature Indicator which comprises a rate controlling film formed into a sealed pouch having contained therein a frangible ampule containing the gas generating means, said ampule being enclosed in a porous medium, said medium containing an indicator composition responsive to the gas generated by the gas generating means, so as to indicate a color change thereby making the user aware that the gas ampule has been broken.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.