Method of producing a coupling for oil country tubular goods
US5363545A · kind A · utility
4Cited by
8References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 14, 1993 |
| Grant date | Nov 15, 1994 |
| Priority date | — |
| Expiry date | Sep 14, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49995
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Producing a coupling for oil country tubular goods having a metal seal and a screw thread tapered toward its end. A plain pipe is cut to a predetermined length and hot-forged with longitudinal compression to form a predetermined thickened shape of its inside surface. After quenching and tempering, the outside surface of the pipe is machined, and the inside surface is machined and is then threaded. The pipe is coated or plated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.