Method for detecting the presence of contaminants in a reusable plastic food or beverage container
US4910406A · kind A · utility
9Cited by
17References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 29, 1988 |
| Grant date | Mar 20, 1990 |
| Priority date | — |
| Expiry date | Dec 29, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/0081
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
This invention relates to a method for detecting whether contaminants are on or have migrated into the body of a plastic reusable food or beverage container. The invention uses a sensor attached to the inside of the container which changes optical density when it is exposed to certain contaminants. The change in optical density is detected by illuminating the sensor with ultraviolet light and then measuring the effect that the sensor has on the ultraviolet light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.