Timer based on chemical sensing
US9529335B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 2014 |
| Grant date | Dec 27, 2016 |
| Priority date | — |
| Expiry date | Jan 7, 2035 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2205/584
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An elapsed timer device includes a timer element comprising a timer chamber, a timer chamber conditioning material disposed within the timer chamber, and a sensor arranged to sense a timer chemical within the timer chamber. The sensor indicates elapsed time in response to a threshold level of the chemical being present within the timer chamber. The timer chamber, timer chemical adsorption/desorption characteristics of the timer chamber conditioning material, and the sensor are configured so that an amount of the timer chemical within the timer chamber reaches the threshold level within a predetermined time after initialization of the timer element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.