Patent · US Expired

Method for quality control of packaged organic substances and packaging material for use with this method

US5407829A · kind A · utility

40Cited by

19References

15Claims

0Family size

Assignee

AVL Medical Instruments · CH

Inventors

Otto S. Wolfbeis · Regensburg, DE
Helmut List · Graz, AT

Key dates

Filing date	Jun 29, 1993
Grant date	Apr 18, 1995
Priority date	—
Expiry date	Jun 29, 2013

Classification

Technology area (CPC G)Physics
CPC primaryG01N2001/2229
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

For quality control of packaged organic substances, preferably packaged foods and drugs, the materials to be examined are brought into contact with a planar optical sensor element which is applied on the inside of the wrapping and responds to a change in the gas composition in the gas space above the sample by a change in color or fluorescence. The change of one of the optical properties of the sensor element is detected visually or opto-electronically.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.