US Patent No: 7,425,829
Number of patents in Portfolio can not be more than 2000
Tracking positions of personnel, vehicles, and inanimate objects
Stats
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Sep 16, 2008
Issued date -
Oct 7, 2004
filing date -
10/961,841
serial no -
In Force
status
Importance
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Abstract
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 field. A positional relationship between the receiver and the device is monitored using the output. In one aspect, changing the positional relationship, by moving the device nearer to a boring tool which supports the receiver, causes an increase in accuracy of depth determination. In another aspect, determination of an actual overhead position of the boring tool, and its application, are described. Use of a plurality of measurements over at least one-half revolution of each magnet is disclosed. Establishing a surface radial direction toward a boring tool and resolution of multi-valued parameters is described. Calibration techniques, as well as a three transmitter configuration are also described.
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First Claim
Related Publications
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 6,223,826 Auto-extending/retracting electrically isolated conductors in a segmented drill string | 85 | 1999 | |
| 6,285,190 Skin depth compensation in underground boring applications | 30 | 1999 | |
| 6,496,008 Flux plane locating in an underground drilling system | 35 | 2000 | |
| 6,727,704 Boring tool tracking/guiding system and method with unconstrained target location geometry | 9 | 2001 | |
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| 6,380,732 Six-degree of freedom tracking system having a passive transponder on the object being tracked | 67 | 1999 | |
| 6,615,155 Object tracking using a single sensor or a pair of sensors | 50 | 2001 | |
| 2001/0038,354 Six-degree tracking system | 13 | 2001 | |
| 2002/0005,719 Intrabody navigation and imaging system for medical applications | 26 | 2001 | |
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| 5,646,524 Three dimensional tracking system employing a rotating field | 91 | 1993 | |
| 5,646,525 Three dimensional tracking system employing a rotating field | 41 | 1995 | |
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| 5,002,137 Moling system | 54 | 1989 | |
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| 4,812,812 Apparatus and method for determining the position and orientation of a remote object | 47 | 1987 | |
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| 5,589,775 Rotating magnet for distance and direction measurements from a first borehole to a second borehole | 155 | 1995 | |
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 7.5 Year Payment | $3600.00 | $1800.00 | $900.00 | Mar 16, 2016 |
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Mar 16, 2020 |
| Fee | Large entity fee | small entity fee | micro entity fee |
|---|---|---|---|
| Surcharge - 7.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
| Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |