Top drive systems
US7401664B2 · kind B2 · utility
10Cited by
49References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 28, 2006 |
| Grant date | Jul 22, 2008 |
| Priority date | — |
| Expiry date | Jan 27, 2027 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B19/16
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A top drive system for wellbore operations, the top drive system including motor apparatus, a main shaft driven by the motor apparatus, the main shaft having a top end and a bottom end, a quill connected to the main shaft, and a gear system interconnected with the quill and the motor apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.