Reservoir pad for time indicator
US3962920A · kind A · utility
31Cited by
5References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 24, 1975 |
| Grant date | Jun 15, 1976 |
| Priority date | — |
| Expiry date | Feb 24, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01K3/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Indicating device suitable for visibly measuring parameters such as time, temperature, and time-temperature relationships. The device comprises in combination a porous reservoir pad containing an indicating material, a wick material and activating means. The progress of the indicating material along the wick can be visibly observed to indicate the passage of time, exposure to a given minimum temperature, or a time-temperature relationship. The combination is adapted to conveniently regulate migration of the indicating material from the reservoir pad to the wick. A preferred method for making an indicating device is described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.