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| Number | Title | Issue Date |
| 6652243 | Method and apparatus for filling a storage vessel with compressed gas A storage vessel is filled with compressed gas by filling a first tank with gas from a low pressure gas source. Hydraulic fluid is drawn from a reservoir and pumped into the first tank in contact with the gas. This causes the gas in the first tank to flow... | 11/25/2003 |
| 5205720 | Method and apparatus for producing compressed air and water pumping apparatus utilizing the produced air A method and apparatus for producing compressed air includes sealing air in a container capable of reducing its volume by external hydraulic pressure. A weight having a larger specific gravity than water is attached to the container to sink the container ... | 04/27/1993 |
| 4741398 | Hydraulic accumulator-compressor for geopressured enhanced oil recovery A hydraulic accumulator-compressor vessel using geothermal brine under pressure as a piston to compress waste (CO2 rich) gas is used in a system having a plurality of gas separators in tandem to recover pipeline quality gas from geothermal brin... | 05/03/1988 |
| 4643650 | Fluid-raising apparatus driven by low hydraulic head A fluid-raising apparatus includes a compression chamber which receives liquid, from an elevated source, such that gas in the chamber is pressurized and used to lift fluid through a vertical conduit. When the chamber fills with liquid, a float lifts a dra... | 02/17/1987 |
| 4265599 | Hydropneumatic energy system A system for converting a constant pressure head of water into compressed air which may be utilized to transfer the potential energy of the pressure head to remote work sites.... | 05/05/1981 |
