Patent ID: 11933677
Assignee: HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G  C | IPC C  G

Claim 2:
3. The temperature detecting material according to claim 1,
the temperature detecting material further contains a third material containing a third temperature indicating material,
wherein
the third temperature indicating material contains a leuco dye, a color developing agent and a decoloring agent, and has a color density-temperature curve of a hysteresis characteristic,
wherein
the color developing temperature Ta3 in a temperature decrease process is lower than the decoloring temperature Td3 in a temperature increase process,
wherein
the third temperature indicating material turns to a liquid state and is kept in a decoloring state when cooled down after melting to lower than the color developing temperature Ta1 and higher than the color developing temperature Ta3,
and wherein
the first temperature indicating material, the second temperature indicating material, and the third temperature indicating material have a relation Ta3<Ta2<Ta1, Ta1<Td1, Ta1<Td2, Ta1<Td3.