Well apparatus
US4008898A · kind A · utility
3Cited by
2References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 13, 1974 |
| Grant date | Feb 22, 1977 |
| Priority date | — |
| Expiry date | Nov 13, 1994 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/01
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Well apparatus is disclosed in which an inner member is adapted to be sealed with respect to an outer member by means of a seal ring of elastomeric material surrounding the inner member for movement from a first position about a first cylindrical surface in which its outer diameter is spaced from a cylindrical bore in the outer member, and a second position about a second, larger cylindrical surface in which its inner and outer diameters are sealably engaged with said second surface and bore in the outer member, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.