Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Vehicle subsystem or accessory control
Reexamination Certificate
2005-04-19
2008-11-18
Beaulieu, Yonel (Department: 3661)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Vehicle subsystem or accessory control
C280S005500
Reexamination Certificate
active
07454275
ABSTRACT:
An airplane undercarriage including a shock absorber having first and second portions that are movable relative to each other. The undercarriage further including a first wave transceiver assembly disposed on the first movable portion. The assembly includes a first transmitter for transmitting a first wave towards the second movable portion and a first receiver for receiving the first wave after it has been reflected on an obstacle formed by a mechanical part secured to the second movable portion. The undercarriage also includes an independent second wave transceiver assembly disposed on the first movable portion. The second assembly includes a second transmitter for transmitting a second wave towards the second movable portion, and a second receiver for receiving the second wave after it has been reflected on an obstacle formed by a free surface of a hydraulic fluid contained in the shock absorber or a mechanical part defining the free surface.
REFERENCES:
patent: 4092947 (1978-06-01), Labrecque
patent: 5104144 (1992-04-01), Bethell
patent: 5371598 (1994-12-01), Ghaem et al.
patent: 11072132 (1999-03-01), None
patent: WO 2004/028902 (2004-04-01), None
Beaulieu Yonel
McCormick Paulding & Huber LLP
Messier-Dowty S.A.
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