Discharge pipe line locator
US3975735A · kind A · utility
Inventors
Key dates
| Filing date | Sep 19, 1974 |
| Grant date | Aug 17, 1976 |
| Priority date | — |
| Expiry date | Sep 19, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S3/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electronic locator for tracing the course of a metallic discharge line which is disposed underground. A reel means stores a length of flexible hollow cable and is operable when rotated to advance the free end of the cable into the metallic discharge line. Conductors extending through the cable provide for electrically connecting an audio frequency signal generator located on the reel means to a transmitter antenna attached to the free end of the cable. A directional receiver means determines the location of the discharge line by detecting the high strength, varying frequency signals generated by the audio frequency signal generator and radiated by the transmitter antenna through the walls of the metallic discharge line.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.