Holding wrench for drill strings
US3980143A · kind A · utility
92Cited by
7References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1975 |
| Grant date | Sep 14, 1976 |
| Priority date | — |
| Expiry date | Sep 30, 1995 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B19/20
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Apparatus for holding and supporting a string of connected drill pipe sections which are suspended in a bore hole and for assisting in separating one drill pipe section from the string when the string is being disassembled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.