Obstacle detection apparatus

Communications: electrical – Land vehicle alarms or indicators – Of relative distance from an obstacle

Reexamination Certificate

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C340S903000, C340S435000, C701S301000

Reexamination Certificate

active

11227171

ABSTRACT:
An obstacle detection apparatus detects an obstacle to a vehicle by a sensor section including a transmitter which transmits a wave to a predetermined detection area, and a receiver which receives an echo of the wave reflected by the obstacle. The obstacle detection apparatus measures a distance to the obstacle from the output of the sensor section. A detection-distance change circuit changes predetermined detection distances in the maximum detection distance. Alarm means gives an alarm step by step in accordance with the detection distances.

REFERENCES:
patent: 6268803 (2001-07-01), Gunderson et al.
patent: 2002/0030591 (2002-03-01), Paranjpe
patent: 2004/0167718 (2004-08-01), Hoenes et al.
patent: 2005/0280518 (2005-12-01), Bartels et al.
patent: 1-134605 (1989-05-01), None
patent: 6-242238 (1994-09-01), None
patent: 10-119675 (1998-05-01), None
patent: 2002-318282 (2002-10-01), None
Office Action dated Jul. 9, 2007 issued in corresponding Canadian Application No. 2,520,065.
JPO Office Action in corresponding Japanese Appln. 2004-332126, issued Feb. 8, 2008.

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