PDF valve
US6547007B2 · kind B2 · utility
61Cited by
9References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 17, 2001 |
| Grant date | Apr 15, 2003 |
| Priority date | — |
| Expiry date | Apr 17, 2021 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/05
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A differential float and cementing valve assembly used to position and cement casing in a well bore. A leaf spring and other components of the assembly are preferably constructed of composite materials and/or plastics that can be drilled up with polycrystalline diamond compact (PDC) bits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.