Method of and arrangement for driving volatile impurities from ground
August 3, 2008. 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 2764533 2985238 3743355 Underground fluid recovery device Exhaust system and process for removing underground contaminant vapors Earth storage structural energy system and process for constructing a thermal storage well Method and apparatus for removing contaminants from soil Removal of volatile contaminants from the vadose zone of contaminated ground Method of removing and controlling volatile contaminants from the vadose layer of contaminated earth Patent #: 4730672 InventorsAssigneeApplicationNo. 227894 filed on 08/03/1988US Classes:166/267, Separating outside of well166/68, Eduction pump or plunger in well166/242.1, CONDUIT WALL OR SPECIFIC CONDUIT END STRUCTURE166/370, Including varying downhole pressure405/128.2Vacuuming contaminantExaminersPrimary: Dang, Hoang C.Attorney, Agent or FirmForeign Patent References
International ClassE21B 043/00Foreign Application Priority Data1987-08-25 DEAbstractDriving of volatile impurities from a ground by mans of air is performed by aspirating an afterflow air and impurities containing gases which penetrated through a permeable wall of a shaft in a ground, at one or several locations in regions of expected high gas contents, air afterflow passages are extended to these regions for supplying the afterflow air, and an adjustable afterflow resistance is arranged in the passages for influencing a negative pressure value and a flow speed in these regions.Field of SearchSeparating outside of wellIncluding varying downhole pressure Producing the well Fluid enters and leaves well at spaced zones Graveling or filter forming Stacked annular sections Eduction pump or plunger in well WITH BELOW AND ABOVE GROUND MODIFICATION Including non-expulsive material placed in well Separating material entering well By fluid lift RESIDUE ACCESS, HANDLING OR REMOVING MEANS | |
