Patent · US Expired

Method of pipeline filling the interstices of controlled caving areas

US4726712A · kind A · utility

1Cited by

8References

10Claims

0Family size

Assignee

Bergwerksverband GmbH · DE

Inventors

Friedrich Sill · Essen, DE
Ulrich Kramer · Bensberg, DE
Hans Maurer · Calabasas, US

Key dates

Filing date	Apr 11, 1985
Grant date	Feb 23, 1988
Priority date	—
Expiry date	Apr 11, 2005

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21F15/08
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

In conjunction with the face mining of bituminous coal, previously excavated or some portions of the tunnel are collapsed in a manner to form a mass of debris into which a mixture of electrostatic filter ash and water is injected to stabilize the structure.

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