Thermal history sensor utilizing electrical conductivity and magnetic permeability
US8177423B1 · kind B1 · utility
8Cited by
3References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 19, 2008 |
| Grant date | May 15, 2012 |
| Priority date | — |
| Expiry date | Jul 2, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01K7/38
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention provides a thermal history sensor having a plurality of substrates positioned adjacent to an item. The substrates include different compositions, such that the substrates respond to thermal exposures with different changes in electrical conductivity or magnetic permeability. By measuring the electrical or magnetic properties of the substrates following thermal exposure, information about the thermal history may be obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.