Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Reexamination Certificate
2010-12-28
2011-12-20
Patidar, Jay (Department: 2858)
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
For small object detection or location
C324S067000
Reexamination Certificate
active
08080998
ABSTRACT:
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 second cable to generate a false locating signal. The method includes generating the locating signal frequency. A reference signal is produced. The locating signal frequency is impressed on the reference signal in a way which provides for distinguishing between the locating signal and the false locating signal. The locating signal frequency and the reference signal are summed to produce a summer output. The summer output is coupled onto the first cable such that the first cable emanates the locating signal and the reference signal, and the reference signal can be received for distinguishing between the locating signal and the false locating signal.
REFERENCES:
patent: 3991363 (1976-11-01), Lathrop
patent: 4387340 (1983-06-01), Peterman
patent: 4639674 (1987-01-01), Rippingale
patent: 4775832 (1988-10-01), Pecukonis
patent: 4818944 (1989-04-01), Rippingale
patent: 5093622 (1992-03-01), Balkman
patent: 5194812 (1993-03-01), Yokoi
patent: 5260659 (1993-11-01), Flowerdew et al.
patent: 5361029 (1994-11-01), Rider et al.
patent: 5418447 (1995-05-01), Beha et al.
patent: 5471143 (1995-11-01), Doany
patent: 5754049 (1998-05-01), Howell
patent: 5798644 (1998-08-01), Eslambolchi et al.
patent: 6127827 (2000-10-01), Lewis
patent: 6163144 (2000-12-01), Steber et al.
patent: 6166532 (2000-12-01), Coia et al.
patent: 6215888 (2001-04-01), Eslambolchi et al.
patent: 6353320 (2002-03-01), Eslambolchi et al.
patent: 6407550 (2002-06-01), Parakulam et al.
patent: 6411073 (2002-06-01), Fischer et al.
patent: 6529006 (2003-03-01), Hayes
patent: 6549011 (2003-04-01), Flatt
patent: 6756783 (2004-06-01), Brune
patent: 7057383 (2006-06-01), Schlapp et al.
patent: 7062414 (2006-06-01), Waite et al.
patent: 2003/0058961 (2003-03-01), Fling et al.
patent: 1217391 (2001-06-01), None
Chau Albert W.
Mercer John E.
Merlin Technology Inc.
Patidar Jay
Pritzkau Patent Group LLC
LandOfFree
Distinguishing false signals in cable locating using a... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Distinguishing false signals in cable locating using a..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Distinguishing false signals in cable locating using a... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4267039