When a prior art track circuit for monitoring an electric signal supplied to a rail via a transmitter and a receiver connected to the rail for detecting a presence of a train using a phenomenon in which the reception level of a signal drops when axles of a train electrically short two rails together and sending …

Legal parties

Inventors (applicants): Kenji Kikuchi, Kentaro Ohkubo, Koushirou Sakado
Assignees (initial): Hitachi, Ltd. (Tokyo, JP)
Agents: Antonelli, Terry, Stout & Kraus, LLP. (attorney)

The application was examined by Jason C Smith (USPTO dept. 3617)


  • 1. A train detector for detecting presence of a first train and a second train …
  • 2. A train detector for detecting presence of a first train and a second train …
  • 3. The train detector according to claim 2 , wherein the train detector has both …

International priority data

JP: 2010-008080 / Jan. 18, 2010 (national)

Cited documents


  • JP 4-52971, May. 1, 1992
  • Kikuchi et al. US 2011/0174934 A1 / 246/122.R, Jul. 1, 2011
  • Ireland US 6729584 B2 / 246/122.A, May. 1, 2004
  • Appleby et al. US 7481400 B2 / 246/249, Jan. 1, 2009
  • Stephens US 6216985 B1 / 246/120, Apr. 1, 2001
  • Holgate US 2003/0038216 A1 / 246/122.R, Feb. 1, 2003
  • Tomlinson et al. US 2008/0142645 A1 / 246/122.R, Jun. 1, 2008
  • Bachetti et al. US 5720454 A / 246/34.R, Feb. 1, 1998
  • Arita et al. US 2004/0227036 A1 / 246/209, Nov. 1, 2004
  • JP 2002-308095, Oct. 1, 2002
  • Perreault et al. US 6011508 A / 342/350, Jan. 1, 2000
  • Westlake US 2001/0015578 A1 / 307/125, Aug. 1, 2001

Brief Description of the Drawings

FIG. 1 is an explanatory view showing the arrangement of a train detector for a dual gauge track circuit according to the present invention (embodiment 1); FIG. 2 is an explanatory …


Background of the Invention

1. Field of the Invention The present invention relates to a train detector and a train security device of a dual gauge track circuit in which two or more types …

Detailed Description of the Preferred Embodiments

Now, we will describe preferred embodiments for preventing the deterioration of train detection performance caused by mutual induction among rails in a dual gauge track circuit in which trains having …

More details about Train Detector and Train Security Device for Dual Gauge Track Circuit

Miscellaneous patent data

The patent extension term is 212 days, similar classification categories are Circuitry, Flexible rail, Vehicle-on-line indication, Monitoring locking and release of the route, Intermittent contact, Signals, Track circuits specially adapted for section blocking, Light signals, Mechanisms associated therewith, e.g. blinders, Double, Train annunciators or indicators, mechanically actuated by a part of the vehicle, includes the following drawings: Explanatory view showing a filter, Explanatory view showing the arrangement, Explanatory view showing the arrangement, Train Detector and Train Security, the protection scope is defined by 4 claims, the invention description is illustrated by 9 drawings, the grant publication number is 08505855, an application examiner - Jason C Smith (3617 USPTO department), developed by Kentaro Ohkubo et al., assigned to a foreign company or corporation, the patent particularly claims a train detector for detecting presence of a first train and a second…, the published agent's organization is Antonelli, Terry, Stout & Kraus, LLP., 9 figures depict the invention details, the assignee location is Tokyo (JP); its company is Hitachi, Ltd., categorized under Miniature model as a primary classification, the claim number 1 is selected as exemplary, the application publication date is Jan. 18, 2011, the patent was granted on Aug. 13, 2013, numbered 13/008,260 (application), the invention is named Train Detector and Train Security Device for Dual Gauge Track Circuit, the recorded applicant's name is Kikuchi Kenji, the inventor's name is Sakado Koushirou.

Invention classification information

The invention is classified under Indicating or recording positions or identities of vehicles or vehicle trains, Miniature model. The designated search classifications include Train annunciators or indicators, Automatic time recording.

Patent details
Publication number 08505855
Publication date Aug. 13, 2013
Kind code B2
Application number 13/008,260
Application date Jan. 18, 2011
Application type U
Application series code 13
Extension term 212
National classification 246/122A
Total number of claims 4
Exemplary claims 1
Number of drawings 9
Number of figures 9
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