Yield strength determination of ferromagnetic materials
US4335352A · kind A · utility
9Cited by
9References
28Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 12, 1979 |
| Grant date | Jun 15, 1982 |
| Priority date | — |
| Expiry date | Dec 12, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/12
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
This invention pertains to two forms of verifier of the grade of oil field tubular goods. The first form can be thought of as a sorter in that it will indicate when a particular length of tubular goods is of a different grade than its companions in a lot. The second form will identify the grade of a length. Both forms depend upon magnetizing or inducing magnetic eddy currents in the pipe which are detected and handled by the invention circuitry to sort or to identify.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.