Patent · US Expired

Drill tool for deep wells

US4460053A · kind A · utility

92Cited by

7References

12Claims

0Family size

Assignee

Christensen, Inc. · US

Inventors

Rainer Jurgens · Celle, DE
Hermann Rathkamp · Celle, DE

Key dates

Filing date	Aug 14, 1981
Grant date	Jul 17, 1984
Priority date	—
Expiry date	Aug 14, 2001

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B10/60
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A rotary bit for oil and gas well drilling has cutting elements set in a hard facing material which in turn is supported by a sintered steel section between the hard facing and the steel base of the bit.

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