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| Number | Title | Issue Date |
| 8125210 | Detector for calculating the depth of a buried conductor A detector for calculating a depth of a buried conductor is provided. The detector includes a plurality of antennas for detecting an electromagnetic field radiated by the conductor and one or more signal processors for calculating the depth of the conductor based on... | 02/28/2012 |
| 8115489 | Detector for detecting a current carrying conductor and a method of validating operation of the detector A detector for detecting a buried conductor comprises a plurality of antennas B, T. Each antenna B, T has a winding wound around the antenna, the winding being connected to a current source for providing a predefined current in the winding. When the predefined curre... | 02/14/2012 |
| 8058874 | System for and method of detecting a buried conductor A system for detecting a buried conductor comprises a transmitter for producing an alternating test current in the buried conductor and a receiver for detecting an electromagnetic field produced by the test current in the buried conductor. A communication link is pr... | 11/15/2011 |
| D648742 | Transmitter | 11/15/2011 |
| 7994770 | Transmitter of a system for detecting a buried conductor A system for detecting a buried conductor comprises a transmitter for generating a test signal in the buried conductor and a detector for detecting an electromagnetic signal resulting from the test signal flowing in the buried conductor. The transmitter comprises a ... | 08/09/2011 |
| 7969137 | System for and method of detecting a buried conductor A system for detecting a buried conductor comprises a transmitter for producing an alternating test current in the buried conductor and a receiver for detecting an electromagnetic field produced by the test current in the buried conductor. A communication link is pr... | 06/28/2011 |
| 7940056 | Time-domain reflectometry The present invention provides a method of time domain reflectometry including transmitting a test signal along a cable under test from one end and sensing and recording a reflected signal from the cable at that end, using the recorded, reflected signal to estimate ... | 05/10/2011 |
| 7847556 | Detector for detecting a buried current carrying conductor A detector 1 for detecting a buried current carrying conductor comprises a digital homodyne receiver. The receiver processes field strength signals induced in a pair of vertically spaced antennae 3, 5. The analogue to digital converter is an audio-grad... | 12/07/2010 |
| D631893 | Receiver | 02/01/2011 |
| D610621 | Label | 02/23/2010 |
| 7567875 | Enhanced sonde recognition A detector for locating a sonde is comprised of a plurality of antennas, a corresponding number of signal isolator modules 1 and a geometrical evaluation module. The magnetic signal generated by the sonde has a fundamental frequency and harmonic frequencies. ... | 07/28/2009 |
| 7342537 | Method of and apparatus for detecting a current carrying conductor A detector 1 for detecting a current carrying conductor determines the presence of a current carrying conductor one or more of passive or active modes. In the passive modes, the detector 1 detects either very low frequency radio signals re-radiated fro... | 03/11/2008 |
| 7339379 | Method of and apparatus for determining if a buried current carrying conductor is buried above predetermined minimum depth A detector 1 for detecting a current carrying conductor has a pair of vertically spaced antennae 3, 5 to detect the magnetic radiation produced by a current carrying conductor as a result of one or both of the mains power supply or an electromagnetic s... | 03/04/2008 |
| 7336898 | Fibre optic communications network A security system for controlling access to an enclosed conduit along which runs fiber optic cable, the conduit having a cover for access to the cable, the system having a communications receiver and a modulator responsive to an output of the receiver for coupling n... | 02/26/2008 |
| 7304480 | Radio mode selectivity block for a detector for detecting a buried current carrying conductor A radio mode selectivity block 41 for a detector 1 for detecting a buried current carrying conductor comprises a plurality of beat frequency oscillators 53 to center the bandwidth of detection of the detector 1 on target very low frequenc... | 12/04/2007 |
| 7235980 | Cable detection apparatus and method A cable detection apparatus is disclosed having a filter, the filter transmitting components of a signal detected substantially at certain harmonics of a first frequency. The filter may also attenuate the signal at certain even harmonics thereof. A method of detecti... | 06/26/2007 |
| 7212131 | Controlling an underground object In order to control the sonde of an underground object, such as an underground boring tool, a predetermined sequence of rotation steps is applied to the object and that sequence is detected. The detection of the appropriate sequence causes the sonde to change its fu... | 05/01/2007 |
| 7184951 | Methods and systems for generating phase-derivative sound Methods and systems for digitally generating sound from phase and amplitude information of a narrow bandwidth signal, such as a narrow bandwidth locator signal. Phase-derivative information is determined from the phase information. The bandwidth of the phase-derivat... | 02/27/2007 |
| 7140232 | Method and apparatus for multiple gas sensor A method and apparatus includes filter for removing a non-tracer gas from detection system and control unit for detecting the presence a low concentration tracer gas in the atmosphere. ... | 11/28/2006 |
| 7116244 | Method and system for producing a magnetic field signal usable for locating an underground object Transmitted magnetic field signals useable for locating an underground object, and methods and systems for generating the same. The magnetic field signal has desired spectral characteristics. More specifically, the transmitted magnetic field signal includes a carrie... | 10/03/2006 |
| 7079591 | Method and system for recovering information from a magnetic field signal usable for locating an underground object A data recovery subsystem for use in a receive system configured to receive a magnetic field signal, the magnetic field signal including a carrier component usable for locating an underground object and at least one modulation sideband. The data recovery subsystem i... | 07/18/2006 |
| 7053789 | Underground object locator A data sonde for use in horizontal directional drilling comprising a battery housing to receive a power supply from an internal battery, a connector to receive a power supply from an external power supply cable, and an antenna to emit radiation, is provided, wherein... | 05/30/2006 |
| 6993088 | Encoding scheme for producing magnetic field signals having desired spectral characteristics Methods and systems for producing an encoded information signal having attenuated low frequency spectral components and a substantially constant average energy. An M bit code word is produced for each N bits of an information signal according to the following condit... | 01/31/2006 |
| 6980123 | Controlling an underground object In order to control the sonde of an underground object, such as an underground boring tool, a predetermined sequence of rotation steps is applied to the object and that sequence is detected. The detection of the appropriate sequence causes the sonde to change its fu... | 12/27/2005 |
| 6977508 | Cable detection apparatus and method A cable detection apparatus is disclosed having a filter, the filter transmitting components of a signal detected substantially at certain harmonics of a first frequency. The filter may also attenuate the signal at certain even harmonics thereof. A method of detecti... | 12/20/2005 |
| 6968296 | Cable detector with decimating filter and filtering method A cable detection or location device is disclosed having a detection stage to produce a detection signal, a decimating filter having an input and an output, the input being coupled to the receiving stage to filter the detection signal and output a down-sampled filte... | 11/22/2005 |
| 6954071 | Pipeline mapping and interrupter therefor Cathodic protection voltages are used to resist the damage to pipes or cables from electrolytic effects. However, localized fields can lead to stray currents and may result in corrosion and it is therefore desirable to detect and analyse those stray currents. Freque... | 10/11/2005 |
| 6843138 | Method and apparatus for measuring air flow A method and apparatus includes a multi-position valve that restricts the air flow when the valve is placed in one position. Pressure tap valves are located are the inlet and outlet ports to measure the pressure differential and thereby determine the airflow rate. | 01/18/2005 |
| 6836231 | Signal generator A signal generator controls power output on the basis of the output from a Δ-Σ modulator or oscillator. That output may be generated in real time by the modulator or oscillator and fed to a switch control logic unit which controls a power switching stage to output... | 12/28/2004 |
| 6825775 | Method and system for reducing interference Method and systems for reducing effects of magnetic field interference that may interfere with a magnetic field signal generated at or near an underground object, where the magnetic field signal is used to monitor the location of the underground object. At least two... | 11/30/2004 |
| 6752951 | Method of manufacture of an integrated camera and lighting device The present invention relates (with reference to FIG. 1a) to a method of manufacture of an integrated camera and illumination device. The method comprises assembling together an optical sensor (12), illumination means (17) and associated ... | 06/22/2004 |
| 6741286 | Integrated camera and illumination device having a regulated current The present invention (with reference to FIG. 2a) relates to an integrated camera and illumination device. The device comprises illumination apparatus having a plurality of light emitting diodes (17) arranged in a circuit which regulates current... | 05/25/2004 |
| 6728662 | Method and system for remotely servicing a detection device A remotely configurable locator system includes a detection device to locate concealed underground conductors. The detection device is configured to connect to a communications network via a graphical user interface. Also included is a database management tool confi... | 04/27/2004 |
| 6717392 | Signal generator A signal generator controls power output on the basis of the output from a Δ-Σ modulator or oscillator. That output may be generated in real time by the modulator or oscillator and fed to a switch control logic unit which controls a power switching stage to output... | 04/06/2004 |
| 6650798 | Identification and location of fiber optic cables In order to identify a fiber optic cable (10) a beam (14) of polarised light is caused to pass down the cable to a first site (A) at which an electromagnetic field (24) is applied to the cable (10). The electromagnetic field (24) traverses the cable (10) ... | 11/18/2003 |
| 6643436 | Identifying fibers of fiber optic cables A method of and apparatus for identifying fibers of fiber optic cables is disclosed. Waveforms may be generated by integer subdivision of a clock, the waveforms for modulation of a laser beam into a set of unique signals. Preferably, however, each wavefor... | 11/04/2003 |
| 6642796 | Digital phase-quadrature oscillator A digital phase-quadrature oscillator generates a series of sine values representative of a sine wave, and a series of cosine values representative of a cosine wave. In each iteration of the oscillator, a sum of the squares of past sine and cosine values ... | 11/04/2003 |
| 6633163 | Apparatus and method for detecting an underground cable while operating a piece of machinery An excavator vehicle has sensors thereon at different heights. Each sensor may have a coil which is generally horizontal and which detects the magnetic field generated by a current in a buried conductor. By detecting the relative magnitudes of the compone... | 10/14/2003 |
| 6617856 | Electronic marker locator system and method A system and method to locate electronic marker balls includes receiving a signal representative of a detected marker ball. The signal includes the resolved in-phase and quadrature-phase (I and Q) components, each centered about a first frequency. The I a... | 09/09/2003 |
| 6617855 | Pipeline mapping and interrupter therefor Cathodic protection voltages are used to resist the damage to pipes or cables from electrolytic effects. However, localised fields can lead to stray currents and may result in corrosion and it is therefore desirable to detect and analyse those stray curre... | 09/09/2003 |
