Temperature indicating compositions of matter
US4232552A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 1978 |
| Grant date | Nov 11, 1980 |
| Priority date | — |
| Expiry date | Sep 28, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S428/913
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Novel and stable compositions of matter are disclosed which change color sharply upon a transition from a liquid state to a solid state or from a solid state to a liquid state, which change of state is at substantially a predetermined temperature corresponding to a temperature to be measured. The constituents of the novel compositions of matter comprise: PA1 1. a solvent (I) consisting of a single substance or a mixture of substances and adapted to change from a solid state at substantially a predetermined temperature to a liquid state and PA1 2. an indicator system (II) consisting of one or more substances different from (I), characterized in that PA2 (a) (II) is soluble in (I) when the latter is in the liquid phase, and PA2 (b) (II) changes color visible to the naked eye when (I) passes from the solid to the liquid phase or from the liquid to the solid phase. Thermometers containing said stable compositions of matter are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.