U.S. patents available from 1976 to present.
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Electokinetic high pressure hydraulic system

Patent 6013164 Issued on January 11, 2000. Estimated Expiration Date: Icon_subject June 25, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Patent References

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Methods and apparatus for real-time monitoring, measurement and control of electroosmotic flow
Patent #: 5441613
Issued on: 08/15/1995
Inventor: McCormick, et al.

Fully integrated miniaturized planar liquid sample handling and analysis device
Patent #: 5571410
Issued on: 11/05/1996
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Apparatus and method for flow injection analysis
Patent #: 5573651
Issued on: 11/12/1996
Inventor: Dasgupta, et al.

Partitioned microelectronic device array Patent #: 5593838
Issued on: 01/14/1997
Inventor: Zanzucchi, et al.

Inventors

Assignee

Application

No. 882725 filed on 06/25/1997

US Classes:

204/450, Electrophoresis or electro-osmosis processes and electrolyte compositions therefor when not provided for elsewhere204/600, Electrophoretic or electro-osmotic apparatus204/647, Particle bed separator (e.g., inert particles, ion exchange beads, etc.)204/648Bulk separator for solids and liquids (e.g., to dewater solids, clarify water, etc.)

Examiners

Primary: Phasge, Arun S.

Attorney, Agent or Firm

International Class

B01D 061/44

Abstract

A compact high pressure hydraulic system having no moving parts for converting electric potential to hydraulic force and for manipulating fluids. Electro-osmotic flow is used to provide a valve and means to compress a fluid or gas in a capillary-based system. By electro-osmotically moving an electrolyte between a first position opening communication between a fluid inlet and outlet and a second position closing communication between the fluid inlet and outlet the system can be configured as a valve. The system can also be used to generate forces as large as 2500 psi that can be used to compress a fluid, either a liquid or a gas.

Other References

  • Liu, Shaorong and Purnendu K. Dasgupta. Analytica Chimica Acta, 283, 739-745. 1993. Electroosmotically pumped capillary flow-injection analysis
  • Dasgupta, Purnendu and Shaorong Liu. Analytical Chemistry, 66, 1792-1798. 1994. Electroosmosis: A reliable fluid propulsion system for flow injection analysis
  • Liu, Shaorong and P.K. Dasgupta. Analytica Chimica Acta, 268, 1-6. 1992. Flow injection analysis in the capillary format using electroosmotic pumping
  • Rastog, R.P., Journal of Scientific and Industrial Research, 28, 298-292. 1969. Irreversible Thermodynamics of Electro-osmotic Effects
  • Cooke, Claude E. Jr. Journal of Chemical Physics, 23, 2299-2303. 1995. Study of electrokinetic effects using sinusoidal pressure and voltage
  • Pretorius, Victor; Hopkins, B.J. and J.D. Schieke. Journal of Chromatography, 99, 23-30. 1974. A new concept for high speed liquid chromatograph
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