Communications: electrical – Selective – Having indication or alarm
Patent
1979-01-03
1981-12-29
Caldwell, Sr., John W.
Communications: electrical
Selective
Having indication or alarm
731465, 731468, 200 6125, 340539, B60C 2302, G08B 1900
Patent
active
043085202
ABSTRACT:
Tire pressure indicator having a wheel mounted transponder unit and a hand-held interrogator unit which can be positioned for coupling with the transponder unit. The transponder unit is a passive device which returns signals to the interrogator unit in accordance with the pressure in the tire mounted on the wheel. When the tire pressure is above a predetermined safe level, a "safe" light on the interrogator unit is illuminated, and when the pressure is below the safe level, a "low" light is illuminated. Operating power for the interrogator unit is supplied by a battery in the unit, and the lights are flashed at a visible rate when the battery voltage drops below a predetermined level.
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Caldwell Sr. John W.
Edcliff Instruments
Nowicki Joseph E.
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