Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Reexamination Certificate
2008-08-21
2009-08-04
LeDynh, Bot (Department: 2862)
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
For small object detection or location
C324S329000, C324S334000, C702S009000
Reexamination Certificate
active
07570060
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.
REFERENCES:
patent: 3046549 (1962-07-01), Kalmus
patent: 3121228 (1964-02-01), Kalmus
patent: 3868565 (1975-02-01), Kuipers
patent: 3876831 (1975-04-01), Wickham et al.
patent: 3983474 (1976-09-01), Kuipers
patent: 4812812 (1989-03-01), Flowerdew et al.
patent: 5002137 (1991-03-01), Dickenson et al.
patent: 5589775 (1996-12-01), Kuckes
patent: 5646524 (1997-07-01), Gilboa
patent: 5646525 (1997-07-01), Gilboa
patent: 6223826 (2001-05-01), Chau et al.
patent: 6285190 (2001-09-01), Brune et al.
patent: 6380732 (2002-04-01), Gilboa
patent: 6496008 (2002-12-01), Brune et al.
patent: 6615155 (2003-09-01), Gilboa
patent: 6727704 (2004-04-01), Brune et al.
patent: 2001/0038354 (2001-11-01), Gilboa
patent: 2002/0005719 (2002-01-01), Gilboa et al.
patent: 2002/0062203 (2002-05-01), Gilboa
Brune Guenter W.
Chau Albert W.
Mercer John E.
Zeller Rudolf
LeDynh Bot
Merlin Technology Inc.
Pritzkau Patent Group LLC
LandOfFree
Tracking positions of personnel, vehicles, and inanimate... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Tracking positions of personnel, vehicles, and inanimate..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tracking positions of personnel, vehicles, and inanimate... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4099845