Coring bit with uncoupled sleeve
US7431107B2 · kind B2 · utility
11Cited by
76References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 22, 2003 |
| Grant date | Oct 7, 2008 |
| Priority date | — |
| Expiry date | Jan 22, 2023 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/02
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A coring bit, including an outer hollow coring shaft, and a rotationally uncoupled internal sleeve disposed inside the outer hollow coring shaft. The rotationally uncoupled internal sleeve may be a non-rotating internal sleeve. The rotationally uncoupled internal sleeve may be a free-floating internal sleeve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.