Temperature indicating compositions of matter
US4339207A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 1980 |
| Grant date | Jul 13, 1982 |
| Priority date | — |
| Expiry date | Jun 27, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01K11/06
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A novel temperature indicating device is disclosed comprising: (a) a flat or gradually curved heat-conducting carrier having one or more cavities, each substantially filled with a novel composition of matter (NTICM), as described herein; or in the alternative, with (1) a `classical` composition of matter which changes from opaque to transparent upon a corresponding change from solid to liquid on top of an (2) indicator means located at the bottom of the cavity; said composition of matter, whether novel or not, being substantially without impurities and containing a substantially spherical void space between the bottom of the cavity; and (b) a transparent cover sheet means in sealing engagement with the heat conducting carrier means overlying and above the cavity, which spherical void space acts to magnify the color change if the novel compositions of matter are present or the presence of an indicator means upon melting of the `classical` compositions of matter in the cavity. Novel and stable compositions of matter (NTICM) 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 …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.