Controlled power source for underground line location

Communications: electrical – Condition responsive indicating system – Specific condition

Reexamination Certificate

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Details

C340S315000, C340S537000, C340S538000, C340S870390, C323S208000, C333S124000

Reexamination Certificate

active

07091872

ABSTRACT:
A transmitter for a line locator system that controls the electrical current, voltage or power applied to the target line is disclosed. Control of the electrical output of the transmitter can be achieved passively or by means of a feedback control system. A transmitter connected directly to a line can include an operator control and monitoring of current being supplied to a line to be located. Some transmitters include a current regulating circuit that controls current supplied to a line. In some transmitters, feedback controllers and feedback loops are used to regulate output current, voltage or power. Some control loops are based on monitoring currents in circuits; some control loops monitor power output from an inductive mode transmitter antenna. An inductively coupled transmitter with power output control is also disclosed.

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patent: 6433978 (2002-08-01), Neiger et al.
patent: 6452482 (2002-09-01), Cern

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