Fluid handling – Self-proportioning or correlating systems – Self-proportioning flow systems
Reexamination Certificate
2005-02-22
2005-02-22
Krishnamurthy, Ramesh (Department: 3753)
Fluid handling
Self-proportioning or correlating systems
Self-proportioning flow systems
C137S607000, C137S898000
Reexamination Certificate
active
06857443
ABSTRACT:
A gas flow control mechanism for a gas blender comprising: a voltage sensitive orifice defining a passage for each gas to be controlled and having an inlet port in fluid communication with a gas source and an outlet port in fluid communication with a plenum for mixing at least two gases; a gas flow controller placed in a feed back loop to adjust at least a parameter or characteristic of a gas flow exiting from the orifice through the outlet port to preset value; the gas flow controller comprising a gas flow resistor in fluid communication with the gas exiting from the orifice and adapted to generate an output signal based on a gas flow characteristic, and a comparator, responsive to the gas resistor flow signal, to continuously evaluate and monitor the characteristic of the gas exiting from the orifice, compare the same with the preset value and minimize any difference therebetween by adjusting current supplied to the orifice which in turn adjusts the gas flow therethrough to the preset value by adjusting the passage.
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Herbert Paul
Krishnamurthy Ramesh
Riches McKenzie & Herbert LLP
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