Temperature monitoring
US4114559A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 28, 1975 |
| Grant date | Sep 19, 1978 |
| Priority date | — |
| Expiry date | Aug 28, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01K3/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Temperature of a blood bag or other refrigerated package is continuously monitored throughout long periods of low temperature transportation and/or storage by an attached button. If the package contents exceed the predetermined safe upper temperature limit, the button produces an indication of having exceeded such limit sometime during transportation and/or storage. The indication is provided by a visual marker mounted on a metal part having a phase transition temperature corresponding to said limit and formed above the safe temperature to have a position which holds the indicator in a visible position corresponding to excessive temperature. The wire is shaped to a second position at freezing temperatures below said safe temperature by means which provide a visual indication of such setting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.