Method for maintaining a correct density gradient in a non-convecting solar pond
Patent 4249518 Issued on February 10, 1981. Estimated Expiration Date: 
October 22, 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.
October 22, 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 681407 2843536 3372691 Temperature differential sensing and control device Patent #: 4017028 InventorApplicationNo. 06/086769 filed on 10/22/1979US Classes:126/567, With means to extract heat from pond liquid126/561, SOLAR HEAT COLLECTOR FOR POND OR POOL126/585, Temperature responsive126/592LiquidExaminersPrimary: Scott, SamuelAssistant: Barrett, Glenn T. Attorney, Agent or FirmInternational ClassF28D 20/00 (20060101)AbstractThe present invention resides in a method and apparatus for maintaining a substantially constant salt density gradient in a non-convecting salt gradient pond. The apparatus for carrying out the method of the present invention enables one to maintain a substantially constant salt density gradient automatically in a highly efficient, simple and economic manner.Other References
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