Electro-optic liquid level sensing system for aircraft...

Measuring and testing – Liquid level or depth gauge – With illumination

Reexamination Certificate

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Reexamination Certificate

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07017408

ABSTRACT:
The electro-optic liquid level sensing system detects a level of liquid in a container having an upper opening, such as for a server container of a beverage maker for a transport system, such as for aircraft, trains, trucks, buses and the like. A support housing mates with the upper opening of the container, and a primary liquid level sensor is mounted in the support housing for non-intrusively measuring the liquid level. A secondary liquid level sensor may be mounted in the support housing to sense a predetermined liquid level to prevent accidental overflows. Protective lenses may be placed in front of the primary liquid level sensor.

REFERENCES:
patent: 3741656 (1973-06-01), Shapiro
patent: 4247784 (1981-01-01), Henry
patent: 4873863 (1989-10-01), Bruhl et al.
patent: 6082419 (2000-07-01), Skell et al.
patent: 2003/0133479 (2003-07-01), Morikawa et al.
patent: 2003/0223221 (2003-12-01), Yeh et al.

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