Annular packing unit and insert
US4657263A · kind A · utility
6Cited by
13References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 19, 1984 |
| Grant date | Apr 14, 1987 |
| Priority date | — |
| Expiry date | Oct 19, 2004 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A packer unit and packer insert adapted for use in an annular blowout preventer. The packer insert includes a generally longitudinal web with its leading edge facing the axial bore of the packing unit sloping from top to bottom in a generally radially outward direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.