Dye solutions for use in methods to detect the prior evaporation of anhydrous ammonia and the production of illict drugs
US7148066B2 · kind B2 · utility
1Cited by
50References
38Claims
0Family size
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Key dates
| Filing date | Aug 2, 2004 |
| Grant date | Dec 12, 2006 |
| Priority date | — |
| Expiry date | Aug 8, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/175383
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Systems and methods providing for the introduction of a dye, particularly a xanthene dye, and more particularly a rhodamine dye, to liquid anhydrous ammonia to discourage theft of the anhydrous ammonia and provide for leak detection in storage vessels. The dye will stain objects which come into contact with the liquid anhydrous ammonia allowing for the detection of such contact. Generally, the staining will be visible to the naked eye, but may also fluoresce when exposed to a particular light source such as ultra violet (UV) light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.