Fluid dispensing apparatuses and methods thereof
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United States of America Patent
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Jul 17, 2012
Grant Date -
May 21, 2009
app pub date -
Aug 22, 2008
filing date -
Aug 23, 2007
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A system for dispensing with a valve-less block including internal air passages coupled with an air source and internal dispensing passages coupled with a flow channel. The flow channel is disposed external to the block and couples with a fluid source. The dispensing passages are further configured in fluid communication with the air passages and place the flow channels in fluid communication with the air passages. A port is defined in the block to dispense fluid from the block. At least one sensor is coupled with each flow channel and indicates the presence of at least one of air and fluid in the flow channel. The detection of air or fluid ensures a location of a flow front of a fluid residing in the flow channel, and ensures the presence of an air gap that serves as a check valve to prevent mixing of fluids and to prevent backflow.
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