Measuring and testing – Liquid level or depth gauge – Thermal type
Reexamination Certificate
2005-08-09
2005-08-09
Williams, Hezron (Department: 2856)
Measuring and testing
Liquid level or depth gauge
Thermal type
C073S291000, C073S292000, C165S168000
Reexamination Certificate
active
06925872
ABSTRACT:
The present invention deals with determining the level of fluid in a container. Typically, a beverage container containing a liquid will absorb heat energy from the surrounding environment at a greater rate than a gaseous component in the headspace of the beverage container. Thus, as the liquid is drawn from a beverage container a greater headspace results. If a thermometric measuring device is employed along the height of the beverage container the volume may be determined by observing the difference in the temperature along the height of the beverage container. In practice, a beer keg may exhibit a difference of as much as 9 degrees Fahrenheit on the exterior surface of the beer keg when measured at the headspace as opposed to the area where the liquid is present in the beverage container.
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http://explanation-guide.info/meaning/ambient-temperature.html.
brochure entitled Raynger® ST™ that describes ST30 Pro™ Standard and ST30 Pro™ Enhanced non-contact thermometers.
A product label from a device apparently corresponding to that disclosed in the Gilmour patent.
Collins Forrest L.
Forrest L. Collins Law Offices, LLC
Jackson André K.
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