Retrievable plug for offshore platforms having shear type retaining means
US4249576A · kind A · utility
4Cited by
7References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 30, 1979 |
| Grant date | Feb 10, 1981 |
| Priority date | — |
| Expiry date | Jul 30, 1999 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/134
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A reusable plug for sealing the conductor pipe of offshore platforms comprising a cylindrical housing, central body member and pressure equalization means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.