Method of using a subsurface safety valve
US3939913A · kind A · utility
6Cited by
2References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 4, 1974 |
| Grant date | Feb 24, 1976 |
| Priority date | — |
| Expiry date | Nov 4, 1994 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A pressure operated safety valve adapted to be mounted in a well tubing, which may be moved to open or closed positions independently of pressure in the tubing and locked in and unlocked from the open position using control fluid pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.