Sanitation indicator
US4353990A · kind A · utility
43Cited by
7References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 9, 1981 |
| Grant date | Oct 12, 1982 |
| Priority date | — |
| Expiry date | Feb 9, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01K3/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for monitoring thermal energy input and displaying the relationship of the thermal energy input to a selected time/temperature relationship. The device employs an indicating material which, when melted, expands and flows into a narrow channel to provide an irreversible, visible indication of the thermal energy to which the device has been exposed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.