Hydro-air storage electrical generation system
Patent 3939356 Issued on February 17, 1976. Estimated Expiration Date: 
February 17, 1993. 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.
February 17, 1993. 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 1247520 2962599 3523192 3538340 3755076 InventorAssigneeApplicationNo. 491222 filed on 07/24/1974US Classes:290/52, TURBOGENERATORS290/54, FLUID-CURRENT MOTORS60/398Utilizing natural energy or having a geographic featureExaminersPrimary: Schaefer, Robert K.Assistant: Feldhaus, John J. Attorney, Agent or FirmAbstractA hydro-air storage system for generating electricity in which a subterranean reservoir containing water is pressurized and the water is pumped to a surface reservoir during periods when the demand for electricity is low and in which water from the surface reservoir flowing into the subterranean reservoir and compressed air released from the subterranean reservoir are both utilized to generate electricity during periods when the demand for electricity is high.Other References
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