7,148,066 Dye solutions for use in methods to detect the prior evaporation of anhydrous ammonia and the production of illict drugs
  Issued: December 12, 2006
  Filed: August 2, 2004
  U.S. Class: 436/56
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.

Posted by GEN-ERIC at 11:05:20 am into the following categories: Patents of the Day

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