Assignee: Seektech, Inc.

Location: San Diego, CA
No. of patents: 23

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Number	Title	Issue Date
8106660	Sonde array for use with buried line locators A sonde array that is useful in locating buried utilities includes at least three substantially mutually orthogonal antennas. Each antenna includes a substantially cylindrical ferromagnetic core, an insulating layer surrounding the core, and a length of a conductor ...	01/31/2012
8035390	Omnidirectional sonde and line locator At least one antenna array including three mutually orthogonal antennas each sharing a common center point senses an electromagnetic signal emitted by a buried object such as a utility line, pipe or sonde. A circuit at least partially mounted in a housing is connect...	10/11/2011
8013610	High-Q self tuning locating transmitter A high-Q human-portable, battery-powered self-correcting tunable resonator in a transmitter apparatus for inducing alternating currents of high quality in buried conductors to facilitate their location. The transmitter apparatus employs an FET-driven capacitive tuni...	09/06/2011
7990151	Tri-pod buried locator system A portable self-standing electromagnetic (EM) field sensing locator system with attachments for finding and mapping buried objects such as utilities and with intuitive graphical user interface (GUI) displays. Accessories include a ground penetrating radar (GPR) syst...	08/02/2011
7969151	Pre-amplifier and mixer circuitry for a locator antenna A pre-amplifier circuit for connection to an antenna of a human-portable locator includes a differential amplifier/mixer pair and means for allowing a common-mode “phantom” signal to modulate a transfer function of the differential amplifier/mixer pair. The comm...	06/28/2011
7948236	Adaptive multichannel locator system for multiple proximity detection A man-portable locator system for locating buried or otherwise inaccessible pipes, conduits, cables, wires and inserted transmitters using detector arrays and stochastic signal processing and similar techniques to analyze and display multiple target objects at diffe...	05/24/2011
7863885	Sondes for locating underground pipes and conduits 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 wi...	01/04/2011
7830149	Underground utility locator with a transmitter, a pair of upwardly opening pockets and helical coil type electrical cords A transmitter for use with an underground utilities locator including a portable elongate housing; an electronic circuit mounted in the housing and configured to generate an electrical output signal at a frequency suitable for tracing an underground utility; a pair ...	11/09/2010
7825647	Method for locating buried pipes and cables A method of locating a buried conductor such as a pipe uses an electronic transmitter to generate a signal having a predetermined frequency with is applied to the pipe via an alligator clip or other appropriate connector. A ground connection to the transmitter is es...	11/02/2010
7755360	Portable locator system with jamming reduction A portable self-standing electromagnetic (EM) field sensing locator system with attachments for finding and mapping buried objects such as utilities and with intuitive graphical user interface (GUI) displays. Accessories include a ground penetrating radar (GPR) syst...	07/13/2010
7741848	Adaptive multichannel locator system for multiple proximity detection A man-portable locator system for locating buried or otherwise inaccessible pipes, conduits, cables, wires and inserted transmitters using detector arrays and stochastic signal processing and similar techniques to analyze and display multiple target objects at diffe...	06/22/2010
7733077	Multi-sensor mapping omnidirectional sonde and line locators and transmitter used therewith Portable locators are disclosed for finding and mapping buried objects such as utilities. A articulatable antenna node configuration and the use of Doppler radar and GPS navigation are also disclosed. ...	06/08/2010
7619516	Single and multi-trace omnidirectional sonde and line locators and transmitter used therewith At least one antenna array including three mutually orthogonal antennas each sharing a common center point senses an electromagnetic signal emitted by a buried object such as a utility line, pipe or sonde. A circuit at least partially mounted in a housing is connect...	11/17/2009
7557559	Compact line illuminator for locating buried pipes and cables A compact line illuminator for applying an oscillating signal to buried or otherwise inaccessible pipes, cables and conductors so that their location can be traced by detecting an electromagnetic signal emitted by these buried objects. The illuminator includes a cir...	07/07/2009
7518374	Reconfigurable portable locator employing multiple sensor array having flexible nested orthogonal antennas A portable locator for detecting a buried object characterized by an electromagnetic (EM) field emission employing three-dimensional (3D) sensor arrays each having three substantially-identical EM field sensors disposed on a flexible annular wall having a radial cen...	04/14/2009
7498816	Omnidirectional sonde and line locator At least one antenna array including three mutually orthogonal antennas each sharing a common center point senses an electromagnetic signal emitted by a buried object such as a utility line, pipe or sonde. A circuit at least partially mounted in a housing is connect...	03/03/2009
7443154	Multi-sensor mapping omnidirectional sonde and line locator Portable locators are disclosed for finding and mapping buried objects such as utilities. A articulatable antenna node configuration and the use of Doppler radar and GPS navigation are also disclosed. ...	10/28/2008
7336078	Multi-sensor mapping omnidirectional sonde and line locators Portable locators are disclosed for finding and mapping buried objects such as utilities. A articulatable antenna node configuration and the use of Doppler radar and GPS navigation are also disclosed. ...	02/26/2008
7332901	Locator with apparent depth indication A human-portable utility locator system for locating and tracing a buried utility line characterized by an electromagnetic field emission. The locator may include a horizontal spaced sensor pair for detecting the horizontal field asymmetry of the emitted field in on...	02/19/2008
7298126	Sondes for locating underground pipes and conduits 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 wi...	11/20/2007
7288929	Inductive clamp for applying signal to buried utilities An inductive clamp includes a pair of jaws configured to surround a conductor, and a pair of handles, each connected to a corresponding jaw. A pivotal connection is provided that allows the jaws to close around a conductor. The jaws are optionally biased to hold the...	10/30/2007
7276910	Compact self-tuned electrical resonator for buried object locator applications A self-tuning resonator for use in a transmitter apparatus for inducing alternating currents in a buried conductor. The resonator is dynamically tuned at frequencies below 500 kHz by exploiting the inherent voltage-variability of net capacitance in multilayer cerami...	10/02/2007
7221136	Sondes for locating underground pipes and conduits 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 wi...	05/22/2007

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Assignee: Seektech, Inc.