Optics: measuring and testing – By particle light scattering – With photocell detection
Reexamination Certificate
2007-07-10
2007-07-10
Pham, Hoa Q. (Department: 2886)
Optics: measuring and testing
By particle light scattering
With photocell detection
C356S246000
Reexamination Certificate
active
10899607
ABSTRACT:
A cytometer having two or more chambers or regions in a containment structure of sheathing fluid that may be used to provide hydrodynamic focusing of another fluid having particles to be observed. The latter fluid may be a core stream which may have its lateral position in a flow or measurement channel affected by control of at least one of the parameters of the several segments of the sheathing fluid. The lateral position of the core stream may be aligned with a light source and detector for a count and observation of the particles. Electrical signals from the detector may be fed back to a processor which may control one or more parameters of the sheathing fluid in the various chambers or regions via pumps, valves, and flow and pressure sensors. This control of parameters may provide for the positioning of the core stream. This cytometer may be miniaturized.
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Cox James A.
Fritz Bernard S.
Fredrick Kris T.
Pham Hoa Q.
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