Measuring and testing – Volume or rate of flow – Expansible chamber
Reexamination Certificate
2006-01-24
2006-01-24
Lefkowitz, Edward (Department: 2855)
Measuring and testing
Volume or rate of flow
Expansible chamber
C428S375000
Reexamination Certificate
active
06988402
ABSTRACT:
A cast-in-place and lithographically shaped mobile, monolithic polymer element for fluid flow control in microfluidic devices and method of manufacture. Microfluid flow control devices, or microvalves that provide for control of fluid or ionic current flow can be made incorporating a cast-in-place, mobile monolithic polymer element, disposed within a microchannel, and driven by fluid pressure (either liquid or gas) against a retaining or sealing surface. The polymer elements are made by the application of lithographic methods to monomer mixtures formulated in such a way that the polymer will not bond to microchannel walls. The polymer elements can seal against pressures greater than 5000 psi, and have a response time on the order of milliseconds. By the use of energetic radiation it is possible to depolymerize selected regions of the polymer element to form shapes that cannot be produced by conventional lithographic patterning and would be impossible to machine.
REFERENCES:
patent: 6770201 (2004-08-01), Shepodd et al.
patent: 6865939 (2005-03-01), Kirby et al.
Hasselbrink, Jr. Ernest F.
Kirby Brian J.
Rehm Jason E.
Shepodd Timothy J.
Lefkowitz Edward
Nissen Donald A.
Sandia National Laboratories
Thompson Jewel V.
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