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| Number | Title | Issue Date |
| 8172057 | Drive mechanism and method A drive train is used at least including an input shaft and an output shaft. A clutch member is rotatable by a clutch shaft about an axis of rotation. The clutch shaft is supported for lateral movement along the axis of rotation to move the clutch member to cooperat... | 05/08/2012 |
| 8080998 | Distinguishing false signals in cable locating using a reference signal A method is described for use with first and second in-ground cables such that, when the first cable is driven at a locating signal frequency to emit a locating signal in an electromagnetic form, the locating signal can be coupled to the second cable to cause the se... | 12/20/2011 |
| 7960973 | Tracking positions of personnel, vehicles, and inanimate objects A device rotates at least one static magnetic field about an axis, producing a rotating magnetic dipole field, and is movable in relation to the surface of the ground. The field is periodically sensed using a receiver to produce a receiver output responsive to the f... | 06/14/2011 |
| 7954614 | Drive mechanism and method A drive train is used at least including an input shaft and an output shaft. A clutch member is rotatable by a clutch shaft about an axis of rotation. The clutch shaft is supported for lateral movement along the axis of rotation to move the clutch member to cooperat... | 06/07/2011 |
| 7884610 | Distinguishing false signals in cable locating Discriminating between a cable locating signal and a false cable locating signal is described. A reference signal, which contains a locating signal frequency impressed on it, is transmitted in a way which provides for detection of a phase shift between the locating ... | 02/08/2011 |
| 7859249 | Tracking positions of personnel, vehicles, and inanimate objects A device rotates at least one static magnetic field about an axis, producing a rotating magnetic dipole field, and is movable in relation to the surface of the ground. The field is periodically sensed using a receiver to produce a receiver output responsive to the f... | 12/28/2010 |
| 7586308 | Phase shifted locating signal as compensation for a coupling configuration phase shift in discriminating a false locating signal When a first cable is driven at a locating signal frequency to emit a locating signal, the locating signal can be coupled to a second cable to cause the second cable to generate a false locating signal. As part of discriminating the false signal from the locating si... | 09/08/2009 |
| 7570060 | Tracking positions of personnel, vehicles, and inanimate objects A device rotates at least one static magnetic field about an axis, producing a rotating magnetic dipole field, and is movable in relation to the surface of the ground. The field is periodically sensed using a receiver to produce a receiver output responsive to the f... | 08/04/2009 |
| 7466135 | Boring technique using locate point measurements for boring tool depth prediction A method is disclosed as part of an overall process in which a boring tool is moved through the ground within a given region along a particular path in an orientation which includes pitch. A locating signal is transmitted from the boring tool which signal exhibits a... | 12/16/2008 |
| 7425829 | Tracking positions of personnel, vehicles, and inanimate objects A device rotates at least one static magnetic field about an axis, producing a rotating magnetic dipole field, and is movable in relation to the surface of the ground. The field is periodically sensed using a receiver to produce a receiver output responsive to the f... | 09/16/2008 |
| 7403014 | Tracking the positional relationship between a boring tool and one or more buried lines using a composite magnetic signal A boring tool is moved through the ground in a region which includes at least one electrically conductive in-ground line and which is subject to static magnetic fields including the magnetic field of the earth. Tracking a positional relationship between the boring t... | 07/22/2008 |
| 7403013 | Boring tool tracking/guiding system and method with unconstrained target location geometry Tracking a boring tool is performed within an underground region using a locating signal. The boring tool is moved through the ground during a series of distance movements such that potential movement of the boring tool during any one of the distance movements is le... | 07/22/2008 |
| 7397249 | Apparatus for distinguishing false signals in cable locating Discriminating between a cable locating signal and a false cable locating signal is described. A reference signal, which contains a locating signal frequency impressed on it, is transmitted in a way which provides for detection of a phase shift between the locating ... | 07/08/2008 |
| 7391216 | Locating arrangement and method using boring tool and cable locating signals An arrangement and an associated method are described in which a boring tool is moved through the ground within a given region along a path in which region a cable is buried. The boring tool and the cable transmit a boring tool locating signal and a cable locating s... | 06/24/2008 |
| 7253628 | Tracking the positional relationship between a boring tool and one or more buried lines using a composite magnetic signal A boring tool is moved through the ground in a region which includes at least one electrically conductive in-ground line and which is subject to static magnetic fields including the magnetic field of the earth. Tracking a positional relationship between the boring t... | 08/07/2007 |
| 7237624 | Electronic roll indexing compensation in a drilling system and method An assembly is configured for sensing its roll orientation, referenced to a roll indexing orientation that is defined by the assembly, so as to produce a roll output signal and for transmitting the roll output signal in a predetermined way. A housing is configured t... | 07/03/2007 |
