Environmental condition cumulative tracking integration sensor using shape memory polymer
US8033237B2 · kind B2 · utility
39Cited by
14References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 21, 2006 |
| Grant date | Oct 11, 2011 |
| Priority date | — |
| Expiry date | Jan 27, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01K3/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention utilizes the unique shape recovery properties of shape memory materials, especially shape memory polymers, to provide an inexpensive and easily identified method of determining when a product has been exposed to environmental conditions that would make it likely that the product has expired or is unfit for use. By allowing the shape memory material to alter its shape from a deformed shape to a memory shape in response to exposure to environmental conditions while attached to a visual indication device a viewer can easily determine if a product has expired.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.