Electronic search system

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 6465982
SERIAL NO

09582892

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A search system for a tool. A border cable separates inner and outer areas. A generator feeds the border cable with current, whose magnetic field affects a sensing unit on the tool, and the sensing unit emits signals to a control unit that directs the tool's motion. The current contains at least two components of different frequency. A search cable is placed within the inner area so that it separates a search area, and is fed by a signal generator with an adapted current (e.g., the current direction alternates to be either in phase or out of phase in relation to the current direction in the border cable) so that the magnetic fields in the different areas provide at least three patterns. Accordingly, the control unit can separate the inner, outer, and search areas.

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Patent Owner(s)

  • HUSQVARNA AB

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bergvall, Bengt-Allan Huskvarna, SE 7 321
Petersson, Ulf Tollered, SE 14 806

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