Oil well pipe joint
US4630849A · kind A · utility
140Cited by
12References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 27, 1985 |
| Grant date | Dec 23, 1986 |
| Priority date | — |
| Expiry date | Mar 27, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L58/182
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An oil well pipe joint comprising a metal-to-metal sealing portion without thread is disclosed. A metal-plated or resin-coated layer exhibiting improved resistance to galling is provided on the outer peripheral surface of a thread-free lip portion which constitutes part of the metal-to-metal sealing portion on an externally-threaded member. At the metal sealing portion, satisfactory sealing properties are maintained under severe corrosive conditions, enabling the joint to be connected and disconnected over 10 times, and usually over 25 times.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.