Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of ground fault indication
Reexamination Certificate
2009-01-06
2011-11-15
Dole, Timothy J (Department: 2858)
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of ground fault indication
C439S095000, C439S100000, C174S068300, C174S064000, C333S012000, C285S217000
Reexamination Certificate
active
08058879
ABSTRACT:
A voltage indicating coupling for metal conduit systems to indicate the presence or absence of voltage on a wire enclosed by a section of electrical conduit for a grounded AC power distribution system. Through the use of two opposing rectifiers the National Electrical Code requirement that the entire metal conduit system be grounded is met. The voltage indicating coupling comprises a liquid crystal display (LCD), a static suppression resistor, two opposing rectifiers for grounding purposes, a plastic block housing and two clamping screws with corresponding wire terminals. At least one “hot” conductor enclosed by the section of electrical conduit is capacitively coupled to the conduit creating a complete circuit through the liquid crystal display (LCD), the static suppression resistor and the opposing rectifiers. The path around the circuit is completed by a ground connection on the grounded part of the conduit system, and the ground connection at the transformer.
REFERENCES:
patent: 3404335 (1968-10-01), Kidder
patent: 3697896 (1972-10-01), Sarkozi et al.
patent: 3988052 (1976-10-01), Mooney et al.
patent: 4471294 (1984-09-01), Nielsen
patent: 4721916 (1988-01-01), Hanasawa
patent: 5233495 (1993-08-01), De Palma et al.
patent: 5404104 (1995-04-01), Rivola
patent: 5466890 (1995-11-01), Stagnitti
patent: 5553896 (1996-09-01), Woodward
patent: 5642052 (1997-06-01), Earle
patent: 5854556 (1998-12-01), Steennis
patent: 6005518 (1999-12-01), Kallina
patent: 6157184 (2000-12-01), Atherton
patent: 6198403 (2001-03-01), Dorrough
patent: 6262369 (2001-07-01), Marik et al.
patent: 6300772 (2001-10-01), Brown
patent: 6359442 (2002-03-01), Henningson
patent: 6459271 (2002-10-01), Vokey
patent: 6504382 (2003-01-01), Smith
patent: 6531878 (2003-03-01), Bystrom
patent: 6624622 (2003-09-01), Noh
patent: 6708126 (2004-03-01), Culler
patent: 6762461 (2004-07-01), Kawamoto
patent: 6794879 (2004-09-01), Lawson
patent: 6850073 (2005-02-01), Elms
patent: 7102345 (2006-09-01), Jackson
patent: 7164273 (2007-01-01), Bailey
patent: 7227372 (2007-06-01), Bae
patent: 7893686 (2011-02-01), Atherton
patent: 2002/0016675 (2002-02-01), Vail, III
patent: 2002/0024342 (2002-02-01), Bussinger
patent: 2002/0140433 (2002-10-01), Lawson
patent: 2003/0057956 (2003-03-01), Iasso et al.
patent: 2004/0201380 (2004-10-01), Zimmermann
patent: 2006/0109601 (2006-05-01), Bolz
patent: 2008/0012338 (2008-01-01), Wiese
patent: 2008/0042657 (2008-02-01), Radle
patent: 2008/0048710 (2008-02-01), Cern
patent: 2008/0100282 (2008-05-01), Crick
patent: 2008/0224710 (2008-09-01), Henningson
patent: 2009/0044474 (2009-02-01), Condon et al.
patent: 02082570 (1990-03-01), None
Baldridge Benjamin M
Chernoff Vilhauer & McClung & Stenzel
Dole Timothy J
LandOfFree
Voltage indicating coupling for metal conduit systems does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Voltage indicating coupling for metal conduit systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Voltage indicating coupling for metal conduit systems will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4287882