Measuring and testing – Liquid level or depth gauge – Thermal type
Patent
1991-09-23
1993-04-27
Will, Thomas B.
Measuring and testing
Liquid level or depth gauge
Thermal type
33731, 3404503, 340622, G01F 2304, G01F 2324
Patent
active
052051722
ABSTRACT:
The interface gauge includes at least one transducer for sensing the interface between two media within a reservoir. An elongated flat member has at least one transverse bore. A transducer is loosely contained within the bore. Conductors connect the transducer to a signal comparator and logic network for monitoring an impedance change in the transducer in response to a change in the interface within the reservoir. The gauge can replace conventional mechanical dipsticks in factory made dipstick tubes for crankcases and automatic transmissions in order to monitor oil and transmission fluid levels.
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patent: 4476714 (1984-10-01), Barry et al.
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patent: 4596141 (1986-06-01), Kondo
patent: 4638288 (1987-01-01), Remec
patent: 4654646 (1987-03-01), Charboneau
patent: 4679432 (1987-07-01), Draeger
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patent: 4771271 (1988-09-01), Zanini-Fisher
patent: 4988975 (1991-01-01), Nap
Breston Michael P.
Will Thomas B.
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