Casing wiping dart with filtering layer
US7673688B1 · kind B1 · utility
44Cited by
3References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 9, 2008 |
| Grant date | Mar 9, 2010 |
| Priority date | — |
| Expiry date | Sep 9, 2028 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/16
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A dart may include a foam body, a filtering material at least partially covering the foam body, and a mandrel. The foam body may surround the mandrel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.