Young H Cho

US Patent:

6389818, May 21, 2002

Filed:

Jan 12, 2001

Appl. No.:

09/760232

Inventors:

Young I. Cho - Cherry Hill NJ
Cheolho Bai - Taegu, KR

Assignee:

Vortex Aircon, Inc. - Cherry Hill NJ

International Classification:

F25B 902

US Classification:

62 5, 62498

Abstract:

A refrigeration system utilizing a vortex generator and a diffuser to reduce the pressure differential between the head pressure and suction pressure across a compressor.

US Patent:

6402703, Jun 11, 2002

Filed:

May 18, 2000

Appl. No.:

09/573267

Inventors:

Kenneth Kensey - Chester Springs PA
William N. Hogenauer - Gilbertsville PA
Sangho Kim - Philadelphia PA
Young Cho - Cherry Hill NJ

Assignee:

Visco Technologies, Inc. - Exton PA

International Classification:

A61B 500

US Classification:

600573, 73 173

Abstract:

A blood viscosity measuring system and methods for measuring blood viscosity monitors the change in height of one of two, oppositely-moving, columns of blood from the circulating blood of a patient and, given the dimensions of a capillary tube through which the blood flows and by detecting a single blood position of the other oppositely-moving column, determines the blood viscosity over a range of shears, especially low shears. The system includes a tube set (disposable or non-disposable) that includes a pair of riser tubes, a capillary tube of predetermined dimensions that is coupled between the riser tubes (or that forms a portion of one riser tube) and a valve mechanism for controlling the circulating flow of blood from the patient into the riser tubes. A sensor monitors the movement of one of the columns of blood in one of the riser tubes and a single point detector detects a single blood position of the other column of blood and an associated microprocessor analyzes this movement and single point, along with the predetermined dimensions of the capillary tube, to determine the viscosity of the patients circulating blood.

US Patent:

6412336, Jul 2, 2002

Filed:

Jul 2, 2001

Appl. No.:

09/897176

Inventors:

Sehyun Shin - Bryn Mawr PA
Young Cho - Cherry Hill NJ
Kenneth Kensey - Malvern PA
William N. Hogenauer - Gilbertsville PA
Sangho Kim - Philadelphia PA

Assignee:

Rheologics, Inc. - Exton PA

International Classification:

G01N 1106

US Classification:

73 5407, 600573

Abstract:

An apparatus and method for determining the viscosity of the circulating blood of a living being over plural shear rates caused by a decreasing pressure differential by monitoring the changing weight of the blood, or the changing level of a column of blood over time. The apparatus and method utilize a riser, a capillary tube, a collector and a mass detector, such as a precision balance or a load cell, for monitoring the changing weight of a sample of fluid that flows through these components under the influence of the decreasing pressure differential; alternatively, the apparatus and method use a column level detector to monitor the changing level of the column of blood over time.

US Patent:

6425249, Jul 30, 2002

Filed:

Mar 24, 2000

Appl. No.:

09/535126

Inventors:

Young I. Cho - Cherry Hill NJ
Cheolho Bai - Taegu, KR

Assignee:

VAI Holdings, LLC - Cherry Hill NJ

International Classification:

F25B 902

US Classification:

62 5, 623246, 62498

Abstract:

An improved refrigeration system utilizing one or more vortex tubes. Vortex tubes produce liquid refrigerant from saturated-state vapor refrigerant in a vapor-compression refrigeration cycle. The efficiency of a refrigeration system can be improved by placing vortex tubes before and after the evaporator.

US Patent:

6428488, Aug 6, 2002

Filed:

Jul 12, 2000

Appl. No.:

09/615340

Inventors:

Kenneth Kensey - Malvern PA 19355
William N. Hogenauer - Gilbertsville PA 19525
John E. Nash - Chester Springs PA 19425
Harold E. Clupper - West Chester PA 19382
Sangho Kim - Philadelphia PA 19104
Young Cho - Cherry Hill NJ 08003
Peter Randolph Hazard Stark - Andover MA 01810
Robert O. Pellizzari - Groton MA 01450
Sergey Kruss - Millis MA 02054

International Classification:

A61B 500

US Classification:

600573, 73 173, 73 54

Abstract:

An apparatus and method for measuring the viscosity of Newtonian and non-Newtonian fluids over a range of shear rates, especially low shear rates, by monitoring two rising columns of fluid (Newtonian or non-Newtonian) that pass through respective capillaries having different lengths. Furthermore, a specialized column monitor is provided that uses multiple interrogation sources (e. g. , lasers) and a single detector (e. g. , a charge-coupled device (CCD) array) to continuously monitor both columns of fluid substantially simultaneously. In particular, the system includes a Y-connector to form two flow paths and wherein each flow path includes a tube that includes a riser tube, a capillary tube of predetermined dimensions and a valve in each for controlling the fluid flow in each path. The specialized column monitor monitors the movement of the fluid columns in each of the riser tubes and an associated microprocessor analyzes these movements, along with the predetermined dimensions of the capillary tubes and riser tubes to determine the viscosity of the fluid.

US Patent:

6430937, Aug 13, 2002

Filed:

Mar 8, 2001

Appl. No.:

09/802763

Inventors:

Young I. Cho - Cherry Hill NJ
Cheolho Bai - Taegu, KR

Assignee:

VAI Holdings, LLC - Cherry Hill NJ

International Classification:

F25B 902

US Classification:

62 5, 62498

Abstract:

The performance of a refrigeration system is often reduced due to insufficient refrigerant charge or due to the use of an inverter compressor. The performance loss is associated with the operating condition, which is not at the optimum, thus yielding less than the maximum EER (energy efficiency ratio). A vortex generator restores the optimum operating condition in the refrigeration system with insufficient refrigerant charge or using an inverter compressor.

US Patent:

6449964, Sep 17, 2002

Filed:

Sep 18, 2001

Appl. No.:

09/954613

Inventors:

Young I. Cho - Cherry Hill NJ
Cheolho Bai - Taegu, KR

Assignee:

Vortex Aircon - Cherry Hill NJ

International Classification:

F25B 100

US Classification:

62114, 62501

Abstract:

A regenerative type of refrigeration system recirculates a mixture of R-134a, R-32 and R-125 through first and second series condensers. In order to increase the concentration of the high-boiling point R-134a, the liquid output of a liquid-vapor separator receives a super-heated mixture vapor tapped from the output of the compressor. An adjustable valve controls the amount of the super heated mixture vapor which is injected to vary the concentration of R-134a in the recirculation line. Liquified R-134a passes through a secondary expansion valve and a secondary evaporator, reducing to an intermediate pressure, and enters a vortex tube, thus bypassing the main evaporator. Subsequently, the suction pressure of the compressor increases, increasing the EER of the refrigeration system. The recirculating concept is also applicable to a single refrigerant system.

US Patent:

6450974, Sep 17, 2002

Filed:

Nov 8, 2000

Appl. No.:

09/708137

Inventors:

Sangho Kim - Philadelphia PA
Sehyun Shin - Bryn Mawr PA
Young I. Cho - Cherry Hill NJ

Assignee:

Rheologics, Inc. - Exton PA

International Classification:

A61B 500

US Classification:

600573, 73 6448

Abstract:

A method for isolating the effects of surface tension and/or yield stress of a fluid that is flowing in a U-shaped tube wherein one or both legs of the U-shaped tube is monitored over time for the changing height of the respective fluid columns therein. A portion of the U-shaped tube comprises a flow restrictor, e. g. , a capillary tube, of known dimensions. Monitoring one or both of the moving fluid columns over time permits the determination of the viscosity of the fluid flowing therein over a range of shear rates from the difference in fluid column heights. However, it is necessary to isolate the effects of surface tension and/or yield stress to obtain an accurate viscosity determination. The method provides one manner in which the surface tension effect can be subtracted from the difference in fluid column heights and then any yield stress effect can then be determined. Alternatively, the method also provides a process by which both the surface tension effect and yield stress effect can be determined simultaneously.