Casing bridge plug with push-out pressure equalizer valve
US4185689A · kind A · utility
54Cited by
4References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 5, 1978 |
| Grant date | Jan 29, 1980 |
| Priority date | — |
| Expiry date | Sep 5, 1998 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B34/142
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A bridge plug having an ejectable plug assembly means in the bore thereof and means for catching the ejectable plug assembly means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.