Measuring and testing – Tire – tread or roadway
Reexamination Certificate
2007-05-29
2007-05-29
Lefkowitz, Edward (Department: 2855)
Measuring and testing
Tire, tread or roadway
C340S442000
Reexamination Certificate
active
11267775
ABSTRACT:
A battery powered tire pressure sensor system with a high sensitivity stretch sensor assembly having a variable resistance longitudinal displacement characteristic. The stretch sensor assembly has at least two juxtaposed stretch sensors, each with a first layer bearing the variable resistance element and a second support layer. The sensor assembly is mounted on or in the side wall of a pneumatic tire so that the assembly is displaced by the tire side wall and the resistance is a function of internal tire pressure. The assembly is coupled to a processor which samples the resistance of the stretch sensor assembly periodically. When the processor determines that the pressure is outside a safe range, an r.f. generator is activated by the processor to generate an unsafe tire pressure signal. This signal is converted by a receiver to a warning for the driver. A power saving unit controls application of electrical power to the system as a function of tire speed to prolong battery life.
REFERENCES:
patent: 6111520 (2000-08-01), Allen et al.
patent: 7000462 (2006-02-01), Hillenmayer et al.
patent: 2004/0252072 (2004-12-01), Adamson et al.
patent: 2005/0059308 (2005-03-01), Parsons
“Strain Gage [sic] Measurement System” (original publication date unknown) printed from an Internet web site on Jul. 11, 2005—shows use of a strain gauge in one branch of a bridge circuit.
“The Strain Gauge” (original publication date unknown) printed from an Internet web site on Jul. 18, 2005-discusses strain gauges in general, and metal foil strain gauges; and bridge circuits using strain gauges as one or all of the bridge resistance elements.
“Reed Switch” (original publication date unknown) printed from an Internet web site-discusses the structure and use of reed switches.
Huang Su Shiong
Zhu Shengbo
Jenkins Jermaine
Lefkowitz Edward
Silicon Valley Micro C. Corp.
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