Google Patents Geothermal heat transfer systemÄownload PDF Info Publication number US4993483A US4993483A US07/468,166 US46816690A US4993483A US 4993483 A US4993483 A US 4993483A US 46816690 A US46816690 A US 46816690A US 4993483 A US4993483 A US 4993483A Authority US United States Prior art keywords line heat container heat exchange slurry Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. ![]() Google Patents US4993483A - Geothermal heat transfer system US4993483A - Geothermal heat transfer system
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