Freeze indicating device
US4132186A · kind A · utility
13Cited by
4References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 31, 1977 |
| Grant date | Jan 2, 1979 |
| Priority date | — |
| Expiry date | Oct 31, 1997 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF05C2225/08
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A freeze indicating device which provides a visible record when it has been exposed to a specified low temperature such as 0.degree. C. The indicator utilizing a two-chamber, constant volume device, one chamber having a variable volume and another chamber being expandable upon freezing of an aqueous liquid therein. The expansion of the aqueous fluid transmitting pressure to the fluid in the variable volume chamber, thus forcing some of its fluid through a capillary passage onto a visible indicator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.