US Patent No: 6,667,685

Number of patents in Portfolio can not be more than 2000

Power line noise filter

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ALSO PUBLISHED AS: 20020063474
ATTORNEY / AGENT: (SPONSORED)
 

Importance

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Abstract

In a power line noise filter, a detection circuit detecting variations in electric current in two conductive lines of an electric power line, thereby detecting common mode noise that causes a change in electric current in the power line. A phase-inverted signal generation circuit then generates a phase-inverted signal whose is inverted to that of the noise detected by the detection circuit. Further, an injection circuit causes a change in electric current corresponding to the phase-inverted signal, for the two conductive lines of the electric power line. The common mode noise causing a change in electric current in the electric power lines is thereby canceled.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
TDK CORPORATIONTOKYO, JP5457

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Saitoh, Yoshihiro Chuo-ku, JP 21 117
Wasaki, Masaru Ichihara, JP 14 161

Cited Art

Patent Info (Count) # Cites Year
 
AT&T CORP. (1)
6,313,738 Adaptive noise cancellation system 44 1997
 
GE SECURITY, INC. (1)
6,441,723 Highly reliable power line communications system 147 2000
 
MASPRODENKOH KABUSHIKIKAISHA (1)
6,373,674 Noise eliminating apparatus of high-frequency transmission system 12 2000
 
ROCKSTAR BIDCO, LP (1)
6,317,031 Power line communications 56 1999
 
TANETOSHI MIURA (1)
4,783,817 Electronic noise attenuation system 42 1987
 
THALIA PRODUCTS, INC. (1)
6,329,905 Power line communication system and method 6 2000
 
THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE ARMY (1)
4,475,214 CW Interference cancelling sytem for spread spectrum signals utilizing active coherent detection 25 1982

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
CURRENT TECHNOLOGIES, LLC (21)
6,977,578 Method of isolating data in a power line communications network 30 2001
6,958,680 Power line communication system and method of using the same 74 2001
7,103,240 Method and apparatus for providing inductive coupling and decoupling of high-frequency, high-bandwidth data signals directly on and off of a high voltage power line 25 2001
6,933,835 Data communication over a power line 67 2002
7,102,478 Power line coupling device and method of using the same 13 2002
7,132,819 Floating power supply and method of using the same 4 2002
6,998,962 Power line communication apparatus and method of using the same 94 2002
6,965,302 Power line communication system and method of using the same 95 2002
7,046,124 Power line coupling device and method of using the same 18 2003
6,980,090 Device and method for coupling with electrical distribution network infrastructure to provide communications 50 2003
6,950,567 Method and apparatus for providing inductive coupling and decoupling of high-frequency, high-bandwidth data signals directly on and off of a high voltage power line 63 2003
7,075,414 Device and method for communicating data signals through multiple power line conductors 56 2003
6,980,091 Power line communication system and method of operating the same 57 2003
6,965,303 Power line communication system and method 65 2003
7,176,786 Method of isolating data in a power line communications network 11 2004
7,250,848 Power line communication apparatus and method of using the same 7 2005
7,307,511 Power line communication system and method 5 2005
7,301,440 Power line communication system and method 8 2005
7,245,212 Power line communication apparatus and method of using the same 6 2005
7,701,325 Power line communication apparatus and method of using the same 3 2007
7,714,682 Power line data signal attenuation device and method 0 2007
 
SUBAUDITION WIRELESS LLC (4)
7,053,756 Facilitating communication of data signals on electric power systems 23 2001
7,199,699 Facilitating communication with power line communication devices 12 2002
6,982,611 Power line coupling device and method of using the same 16 2002
7,224,243 Power line coupling device and method of using the same 2 2005
 
PANASONIC CORPORATION (2)
8,139,759 Line state detecting apparatus and transmitting apparatus and receiving apparatus of balanced transmission system 0 2005
7,949,056 Balanced transmitting apparatus 1 2005
 
YAZAKI CORPORATION (2)
7,286,044 Power line communication device for vehicle 1 2003
7,352,282 Communication system 2 2005
 
ALLEGRO MICROSYSTEMS, INC. (1)
7,936,164 Folding current sensor 2 2008
 
DENSO CORPORATION (1)
7,813,368 Communication system 0 2007
 
KONNO, AKIRA (1)
7,315,171 Electronic judging apparatus for working state of the equipment 0 2006
 
TDK CORPORATION (1)
7,423,520 Noise suppressing circuit 0 2004

Maintenance Fees

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11.5 Year Payment $7400.00 $3700.00 $1850.00 Jun 23, 2015
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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