Valve retrieval mechanism for an inflatable packer system
US4320803A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 26, 1980 |
| Grant date | Mar 23, 1982 |
| Priority date | — |
| Expiry date | Feb 26, 2000 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/1246
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A shifting sleeve retrieval mechanism for use in a valve having a stretched and collapsed configuration and an outer valve member adapted to be fixed against longitudinal movement and an inner valve member adapted to move longitudinally with the outer valve member. A shifting sleeve surrounds a length of the inner valve member and moves longitudinally with respect to both inner and outer valve members. The inner valve member has a shoulder thereon which rides under the shifting sleeve when the valve is collapsed and engages the shifting sleeve when the valve is elongated, thereby moving the shifting sleeve to its original position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.