Float valve sub
US10767446B2 · kind B2 · utility
3Cited by
9References
4Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Jul 21, 2016 |
| Grant date | Sep 8, 2020 |
| Priority date | — |
| Expiry date | Apr 6, 2037 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/05
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A concave section such as an extension section, a cutting section, and a notch section is provided to receive a lid of a float valve in an inside of outer tube assembly of a drill string. Thus, when the float valve is provided for the drill string, it is made possible to collect a core with a larger diameter by a thinner drill string, by expanding the inner diameter of the drill string.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.