Top drive assembly
US7270189B2 · kind B2 · utility
51Cited by
9References
42Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 9, 2004 |
| Grant date | Sep 18, 2007 |
| Priority date | — |
| Expiry date | Aug 25, 2025 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B3/022
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A top drive assembly for wellsite operations may include a quill, a swivel including a swivel housing and a swivel bearing therein in which the quill is supported, a drive system for applying torque to the quill, and link arm hangers extending from the swivel housing and formed to accept and retain link arms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.