Patent · US Expired

Apparatus for the transmission of information in a drill string

US5806612A · kind A · utility

9Cited by

7References

12Claims

0Family size

Assignees

DMT-Gesellschaft Fur Forschung Und Prufung MBH · DE
Welldone Engineering GmbH · DE

Inventors

Werner Vorhoff · Wesel, DE
Dieter Wrobel · Leverkusen, DE
Dagobert Feld · Celle, DE

Key dates

Filing date	Feb 24, 1997
Grant date	Sep 15, 1998
Priority date	—
Expiry date	Feb 24, 2017

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B47/24
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

In a drill string pressure pulses are generated by expansion and constriction of an elastic body to transmit information along the drill string.

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