Monitoring apparatus
US7963692B2 · kind B2 · utility
3Cited by
42References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 26, 2009 |
| Grant date | Jun 21, 2011 |
| Priority date | — |
| Expiry date | Sep 11, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/8326
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A monitoring apparatus is disclosed for monitoring time by a color change indicator, comprising an observable fluid, a first reservoir holding at least a portion of the observable fluid, and a second reservoir abutting the first reservoir. The first reservoir is responsive to pressure on it such that a portion of the observable fluid flows into the second reservoir. The second reservoir is responsive to a lack of pressure in the first reservoir such that a portion of the observable fluid in the second reservoir reverses flow back into the first reservoir once the first reservoir is not under pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.