Patent · US Expired

Method of and arrangement for driving volatile impurities from ground

US4886119A · kind A · utility

42Cited by

9References

20Claims

0Family size

Assignee

Ieg Industrie-Engineering GmbH · DE

Inventors

Bruno Bernhardt · Reutlingen, DE
Anton Hessner · Reutlingen, DE
Rainer Krug · Trochtelfingen, DE

Key dates

Filing date	Aug 3, 1988
Grant date	Dec 12, 1989
Priority date	—
Expiry date	Aug 3, 2008

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B43/02
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

Driving 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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.