Sondes for locating underground pipes and conduits
US7863885B1 · kind B1 · utility
17Cited by
20References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 29, 2007 |
| Grant date | Jan 4, 2011 |
| Priority date | — |
| Expiry date | Aug 25, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/081
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A sonde includes an elongate flexible ferromagnetic core and a coil surrounds an intermediate segment of the core. A housing surrounds and supports the coil. An electronic drive circuit is mounted in the housing for supplying the coil with an electric signal that will induce the core to emit electromagnetic signals at a predetermined strength and frequency that can be remotely detected. Self-contained battery powered float-type and pill-type sondes are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.