Patent · US Expired

Core drilling tool

US4955438A · kind A · utility

34Cited by

7References

11Claims

0Family size

Assignee

Eastman Christensen Company · US

Inventors

Rainer Juergens · Celle, DE
Axel Sperber · Ludwigshafen, DE

Key dates

Filing date	Apr 21, 1989
Grant date	Sep 11, 1990
Priority date	—
Expiry date	Apr 21, 2009

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B47/26
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A core drilling tool for drilling rock in underground soil formations which includes an outside pipe and an inside pipe therein that can be conveyed separately to the surface. The inside pipe includes a core-receiving receptacle at its lower end, and at its upper end is provided with a measurement unit for on-site acquisition, processing and storage of data, such as borehole, core and/or drilling process parameters.

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