Jianjun Jerry Feng

US Patent:

7428848, Sep 30, 2008

Filed:

Aug 9, 2005

Appl. No.:

11/199754

Inventors:

Kapil Pant - Huntsville AL, US
Guiren Wang - Huntsville AL, US
Jianjun Feng - Huntsville AL, US
Shankar Sundaram - Madison AL, US

Assignee:

CFD Research Corporation - Huntsville AL

International Classification:

G01N 1/24

US Classification:

7386321, 73 2802, 73 2804, 7386433, 7386434, 250288, 435 30, 4353091

Abstract:

The present invention is an electrostatic collector for low cost, high throughput, high efficiency sampling and concentration of bioaerosols. The device is small enough to be portable and can be contained within or placed on the wall of a typical office or hospital building. The collector comprises one or more collector modules, each having an ionizing electrode, a conical outer electrode, a wet collection electrode, and a liquid collection system. Airflow through a collector module may be partially blocked to enhance the collection of smaller particles and the collection electrode may comprise multiple, programmable electrodes to focus particle deposition onto a smaller area. Particles are collected into a small volume of liquid to facilitate subsequent analysis by an attached analyzer or at a remote site.

US Patent:

7604394, Oct 20, 2009

Filed:

Sep 6, 2006

Appl. No.:

11/516358

Inventors:

Sivaramakrishnan Krishnamoorthy - Madison AL, US
Jianjun Feng - Cincinnati OH, US

Assignee:

CFD Research Corporation - Huntsville AL

International Classification:

B01F 13/00
H02K 44/00
C12Q 1/68
B03C 5/02

US Classification:

366341, 417 50, 422 50, 204547

Abstract:

Apparatus and methods are disclosed for mixing and self-cleaning elements in microfluidic systems based on electrothermally induced fluid flow. The apparatus and methods provide for the control of fluid flow in and between components in a microfluidic system to cause the removal of unwanted liquids and particulates or mixing of liquids. The geometry and position of electrodes is adjusted to generate a temperature gradient in the liquid, thereby causing a non-uniform distribution of dielectric properties within the liquid. The dielectric non-uniformity produces a body force and flow in the solution, which is controlled by element and electrode geometries, electrode placement, and the frequency and waveform of the applied voltage.

US Patent:

7842006, Nov 30, 2010

Filed:

Nov 17, 2006

Appl. No.:

11/561303

Inventors:

Guiren Wang - Huntsville AL, US
Shivshankar Sundaram - Madison AL, US
Kapil Pant - Huntsville AL, US
Jianjun Feng - Cincinnati OH, US
Peter Storm - Madison AL, US

Assignee:

CFD Research Corporation - Huntsville AL

International Classification:

A61B 17/22

US Classification:

604 22

Abstract:

The present invention is an ultrasonic thrombectomy catheter that produces physical forces (shear rates) strong enough to emulsify obstructions such as thrombi and emboli without causing damage to arterial walls. This is accomplished by properly arranging piezoelectric transducers within a catheter and a tubular catheter head separated by a gap to generate acoustic streaming that simultaneously emulsifies the obstruction and sweeps resulting debris into a catheter lumen for removal. The open gap may be formed by supporting struts that connect the catheter to the catheter head. The design of the catheter tip allows the fabrication of catheters capable of removing partial or complete blockages from arteries and other vessels having diameters as small as 2 mm.

US Patent:

7998328, Aug 16, 2011

Filed:

Jun 27, 2005

Appl. No.:

11/167428

Inventors:

Jianjun Feng - Huntsville AL, US
Guiren Wang - Huntsville AL, US
Sivaramakrishnan Krishnamoorthy - Madison AL, US
Kapil Pant - Huntsville AL, US
Shivshankar Sundaram - Madison AL, US

Assignee:

CFD Research Corporation - Huntsville AL

International Classification:

B03C 5/02

US Classification:

204643, 204450, 204600, 204547

Abstract:

Methods and apparatus for the micro-scale, dielectrophoretic separation of particles are provided. Fluid suspensions of particles are sorted and separated by dielectrophoretic separation chambers that have at least two consecutive, electrically coupled planar electrodes separated by a gap in a fluid flow channel. The gap distance as well as applied potential can be used to control the dielectrophoretic forces generated. Using consecutive, electrically coupled electrodes rather than electrically coupled opposing electrodes facilitates higher flow volumes and rates. The methods and apparatus can be used, for example, to sort living, damaged, diseased, and/or dead cells and functionalized or ligand-bound polymer beads for subsequent identification and/or analysis.

US Patent:

20070110625, May 17, 2007

Filed:

Sep 6, 2006

Appl. No.:

11/516269

Inventors:

Sivaramakrishnan Krishnamoorthy - Madison AL, US
Guiren Wang - Huntsville AL, US
Jianjun Feng - Cincinnati OH, US
Yi Wang - Madison AL, US

International Classification:

B01L 3/00

US Classification:

422099000

Abstract:

A micropump that pumps liquid using electrothermally-induced flow is described, along with a corresponding self-regulating pump and infusion pump. The micropump has applications in microfluidic systems such as biochips. The self-regulating infusion pump is useful for the administration of large and small volumes of liquids such as drugs to patients and can be designed for a wide range of flow rates by combining multiple micropumps in one infusion pump system.

US Patent:

20120130684, May 24, 2012

Filed:

Nov 19, 2010

Appl. No.:

12/949851

Inventors:

Jianjun Feng - West Chester OH, US
Eric Paul Granberg - Springfield Township OH, US
Maxwell Joseph Wingert - Liberty Township OH, US

International Classification:

G06F 17/50

US Classification:

703 1

Abstract:

A method of designing a die cavity can include performing a flow analysis using characteristics of a predetermined die cavity design, density and rheological properties of a material to be extruded, and a flow rate of the material to calculate the pressure distribution exerted on the die cavity and cross-sectional flow profile. The method further includes performing a structural analysis using the calculated pressure distribution and structural characteristics of the die cavity to calculate a deformed die cavity. The flow analysis is then repeated using the characteristics of the deformed die cavity to calculate a pressure distribution exerted on the die cavity and cross-sectional flow profile. The calculated pressure distributions and/or cross-sectional flow profiles are compared to determine if the pressure distributions and/or cross-sectional flow profiles converge. These steps are iteratively repeated until convergence of the pressure and/or cross-sectional flow profile is observed. Once convergence is observed, the variation of the cross-sectional flow profile is analyzed to determine if it is less than a predetermined tolerance.

US Patent:

20120253769, Oct 4, 2012

Filed:

Mar 31, 2011

Appl. No.:

13/077560

Inventors:

Shirdish Poondru - Cincinnati OH, US
Joseph Francis Kitching - Middletown OH, US
Savas Aydore - West Chester OH, US
Hasan Eroglu - Liberty OH, US
Krista Beth Comstock - Mason OH, US
Jianjun Feng - West Chester OH, US
Yunpeng Yang - Mason OH, US
John Ferney McKibben - West Chester OH, US

International Classification:

G06G 7/57

US Classification:

703 9

Abstract:

The present invention relates to a method for airborne particle contamination control, comprising: creating a simulation by modeling a turbulent airflow in an environment that includes an equipment of interest; plotting a flow parameter on the simulation to visualize a flow field of air according to a current design; creating an injection point on the simulation for particles in the environment; determining a particle concentration of the particles; determining, by a computing device and from the particle concentration, whether the current design provides contamination control; in response to determining that the current design does not provide contamination control, creating a modified design; and providing the modified design for implementation. The present invention further relates to a computing device for airborne particle contamination control. The present invention still further relates to a non-transitory computer-readable medium for airborne particle contamination control.

US Patent:

20140005983, Jan 2, 2014

Filed:

Jun 29, 2012

Appl. No.:

13/537495

Inventors:

Thomas Alva BAER - Township OH, US
Jianjun FENG - West Chester OH, US
Douglas Gregory STEVENS - Cincinnati OH, US
Matthew Joseph MACURA - Loveland OH, US

International Classification:

G06F 17/50

US Classification:

703 1

Abstract:

Methods of using computer based models for simulating a porous media.