Method and indicator for detecting the loss of integrity of a package
US4098577A · kind A · utility
92Cited by
8References
25Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 27, 1975 |
| Grant date | Jul 4, 1978 |
| Priority date | — |
| Expiry date | May 27, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S206/807
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A system for indicating the integrity of a normally sealed package utilizes a sensor containing a pH sensitive dye which displays a first color in equilibrium with normal atmospheric conditions and a second color when in equilibrium with an artificial atmosphere comprising an acidic gaseous material. When the air normally in the package is displaced by the artificial atmosphere, the pH sensitive dye assumes its second color. Loss of integrity of the sealed package results in loss of the acidic gaseous material. As a consequence, the pH sensitive dye reverts to its first color, thereby signaling the loss of package integrity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.