Tracing flow of fluids
Patent 4264329 Issued on April 28, 1981. Estimated Expiration Date: 
April 27, 1999. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 27, 1999. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3149068 3656908 3856468 InventorAssigneeApplicationNo. 06/034081 filed on 04/27/1979US Classes:436/27, Using chemical tracers166/252.6, And tracing material436/56TRACERS OR TAGSExaminersPrimary: Marcus, Michael S.Attorney, Agent or FirmInternational ClassE21B 47/10 (20060101)AbstractA tracer system is disclosed which is especially useful for following fluid flow in underground reservoirs. Metal chelates, preferably derived from EDTA and containing a functional group which reacts with a fluorogenic agent, are used as tracers. Liquid chromatography and fluorescense spectroscopy are used to detect the metal chelates.Other References
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