Tire air pressure monitoring device and pneumatic tire...

Details Tire air pressure monitoring device and pneumatic tire... Tire air pressure monitoring device and pneumatic tire...

2005-08-23

2005-08-23

Oen, William (Department: 2855)

Measuring and testing

Tire, tread or roadway

Reexamination Certificate

active

06931921

ABSTRACT:
A tire air pressure monitoring device includes a sensor which detects a physical quantity relating to tire air pressure, and a transmitter which sends signals detected by the sensor. The sensor is a sound pressure level sensor which detects a sound pressure level inside a tire cavity filled with air. The transmitter is enabled to send the signals only when the sound pressure level detected by the sound pressure level sensor is changed.

REFERENCES:
patent: 4186377 (1980-01-01), Barabino
patent: 6175301 (2001-01-01), Piesinger
patent: 6529838 (2003-03-01), Horiuchi et al.
patent: 6630885 (2003-10-01), Hardman et al.
patent: 6880394 (2005-04-01), Boulot
patent: 2003/0233872 (2003-12-01), Boulot

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