Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Reexamination Certificate
2005-04-12
2005-04-12
Le, N. (Department: 2862)
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
For small object detection or location
Reexamination Certificate
active
06879161
ABSTRACT:
A method and apparatus for distinguishing metal objects employing multiple frequency interrogation. In one aspect, the method includes interrogating a target with at least two frequencies, obtaining respective response signals for the two frequencies, resolving the response signals into at least respective resistive component portions, comparing the magnitudes of at least two of the resistive component portions, selecting one response signal from among the response signals based on the comparison, and characterizing the target with the selected response signal. In other aspects, the method includes obtaining response data by interrogating the target at at least two frequencies, normalizing the response data and comparing the normalized response data. A signal is provided indicating the extent of any disagreement in the normalized response data.
REFERENCES:
patent: 3686564 (1972-08-01), Mallick, Jr et al.
patent: 3986104 (1976-10-01), Randolph, Jr.
patent: 4237419 (1980-12-01), Tornblom et al.
patent: 4300097 (1981-11-01), Turner
patent: 4321539 (1982-03-01), Trump
patent: 4439734 (1984-03-01), Weber
patent: 4486712 (1984-12-01), Weber
patent: 4486713 (1984-12-01), Gifford
patent: 4507612 (1985-03-01), Payne
patent: 4678992 (1987-07-01), Hametta
patent: 4853617 (1989-08-01), Douglas et al.
patent: 4890064 (1989-12-01), Candy
patent: 4894618 (1990-01-01), Candy
patent: 4942360 (1990-07-01), Candy
patent: 4992741 (1991-02-01), Douglas et al.
patent: 5028870 (1991-07-01), Reed
patent: 5047718 (1991-09-01), Aittoniemi et al.
patent: 5365169 (1994-11-01), Hosohara et al.
patent: 5405143 (1995-04-01), Takemoto et al.
patent: 5506506 (1996-04-01), Candy
patent: 5521583 (1996-05-01), Frahm et al.
patent: 5523739 (1996-06-01), Manneschi
patent: 5576624 (1996-11-01), Candy
patent: 5642050 (1997-06-01), Shoemaker
patent: 5680048 (1997-10-01), Wollny
patent: 5680103 (1997-10-01), Turner et al.
patent: 5721489 (1998-02-01), Weaver et al.
patent: 5729143 (1998-03-01), Tavernetti et al.
patent: 5777478 (1998-07-01), Jackson
patent: 5786696 (1998-07-01), Weaver et al.
patent: 5959451 (1999-09-01), De Torfino
patent: 5963035 (1999-10-01), Won
patent: 6087833 (2000-07-01), Jackson
patent: 6104193 (2000-08-01), Bell
patent: 6286370 (2001-09-01), Sinha
patent: 6421621 (2002-07-01), Earle
Aurora Reena
Birdwell & Janke, LLP
Le N.
White's Electronics, Inc.
LandOfFree
Method and apparatus for distinguishing metal objects... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for distinguishing metal objects..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for distinguishing metal objects... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3397431