专利名称：Fluid detecting发明人：Robert A. Benson申请号：US07/329326申请日：19890327公开号：US04959639A公开日：19900925
摘要：A flexible rod-and sleeve assembly with rod and surrounding sleeve affixed toeach other at their bottom ends is maintained by a spring to put the sleeve in tension.The assembly is inserted into a cavity such as a monitoring well so as to extend below thelowest level which the water table may assume. The sleeve is made of a material which isattacked by petroleum products but not by water, and when a layer of petroleum liquidsuch as gasoline collects on the surface of the water in contact with some region of thesleeve, the sleeve material loses its strength and ruptures. This results in an upwardmovement of the sleeve, which is used to actuate alarm and signaling mechanisms.
申请人：BENSON; ROBERT A.
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