Kung H Lee
Real Estate Commission in Chadds Ford, PA

5062273, Nov 5, 1991

Jul 12, 1990

7/551954

Kung H. Lee - Chadds Ford PA
Earl M. Clark - Newark DE

E. I. Du Pont de Nemours and Company - Wilmington DE

F25B 4700

62 85

An improved process for separating and removing non-condensible gaseous contaminants (e. g. , nitrogen, oxygen and the like) from a conventional halocarbon vapor compression refrigeration system by withdrawing a vapor stream above liquified refrigerant exiting the condenser on the high pressure side of the expansion valve and then processing this vapor by use of a second compression step, followed by condensation into a receiver. The liquid halocarbon from the receiver is returned to the evaporator while the vapor phase is sent to a semipermeable membrane separation unit. The halocarbon enriched effluent from the semipermeable membrane unit is recycled to the inlet side of the second compressor while the non-condensible contaminant enriched stream is vented from the refrigeration system. Such a high pressure purge loop is useful in selectively removing non-condensible gaseous with minimum halocarbon refrigerant loss.

5196616, Mar 23, 1993

Oct 18, 1991

7/779534

Kung H. Lee - Chadds Ford PA
Domenic J. Barsotti - Vineland NJ
Edward K. Sakata - Newark DE

E. I. Du Pont de Nemours and Company - Wilmington DE

C07C 1738, B01D 5910

570178

A process for separating and recovering an organic phase (e. g. , fluorocarbons such as chlorofluorocarbons, hydrochlorofluorocarbons, hydrofluorocarbons and perfluorocarbons) from a feed stream of a mixture of fluorocarbons and hydrogen fluoride, wherein the mixture is characterized as forming at least one azeotrope or azeotrope-like composition involving at least one fluorocarbon and hydrogen fluoride, by passing the fluorocarbon/HF mixture feed stream through the feed side of a semipermeable membrane unit and then further separating a fluorocarbon-depleted hydrogen fluoride permeate stream and a fluorocarbon enriched residual stream exiting the membrane unit by conventional distillation. An essentially pure fluorocarbon phase and hydrogen fluoride phase are recovered from the distillation with the azeotrope or azeotrope-like distillate being recycled to the inlet of the semipermeable membrane unit.

2013017, Jul 11, 2013

Jan 9, 2012

13/374695

Kung H. Lee - Chadds Ford PA, US

G06Q 30/00

705 261

This invention relates to a business method for reducing costs resulting from returning of unwanted merchandizes from customers. The method involves interacting with the final merchandize recipient prior to shipment of the merchandize.

5064447, Nov 12, 1991

Feb 1, 1991

7/649351

Kung H. Lee - Chadds Ford PA

E. I. Du Pont de Nemours and Company - Wilmington DE

B01D 5304, B01D 5322

55 16

A process for separating and recovering organic vapors (e. g. , chlorofluorocarbons) from a feed stream of organic vapors and air wherein organic vapors are present in the "window concentration" range being too high for conventional carbon adsorption and too low for efficient compression/condensation recovery. By passing the organic vapor and air feed stream through the feed side of a semipermeable membrane unit, a vapor depleted stream exiting the membrane unit can then be processed by conventional carbon adsorption while a vapor enriched stream from the membrane unit can be processed by conventional compression and condensation.

2011021, Sep 1, 2011

Jan 3, 2011

12/930281

Kung H. Lee - Chadds Ford PA, US

A01N 59/04, A01P 7/04, A01P 21/00

5041161, 424700

This invention relates to a plant (vegetation) protecting and regulating environment which uses excessive amounts of carbon dioxide (CO2) coupled with reduced amounts of oxygen (O2) to, simultaneously and collectively, (1) promote plant (vegetation) growth, (2) provide insect control and (3) render effective use of fertilizers. As an illustrative example, such said environment can be provided by using the waste flue gases from coal-fired power plants.

5456841, Oct 10, 1995

Mar 21, 1994

8/215455

Kung H. Lee - Chadds Ford PA

E. I. Du Pont de Nemours and Company - Wilmington DE

B01D 5322

210640

A process is disclosed for separating components of an azeotropic or azeotrope-like mixture containing only organic compounds at least one of which compound is a halocarbon comprising contacting said azeotropic or azeotrope-like mixture with a semipermeable membrane to form at least one exit stream having an increased concentration of at least one component and at least one other exit stream having an increased concentration of at least one other component of the azeotropic or azeotrope-like mixture and, thereafter, recovering at least one exit stream.

5282968, Feb 1, 1994

Aug 3, 1992

7/923671

Kung H. Lee - Chadds Ford PA

E. I. Du Pont de Nemours and Company - Wilmington DE

B01D 1500, B01D 6100

210640

A process is disclosed for separating components of an azeotropic or azeotrope-like mixture containing only organic compounds at least one of which compound is a halocarbon comprising contacting said azeotropic or azeotrope-like mixture with a semipermeable membrane to form at least one exit stream having an increased concentration of at least one component and at least one other exit stream having an increased concentration of at least one other component of the azeotropic or azeotrope-like mixture and, thereafter, recovering at least one exit stream.

4927981, May 22, 1990

Oct 13, 1988

7/257355

Kung H. Lee - Chadds Ford PA

E. I. Du Pont de Nemours and Company - Wilmington DE

C07C 1722

570255

A process is disclosed for the manufacture of chloroform by partial chlorination of methyl chloride-methylene chloride mixtures to produce a chlorinated product mixture containing chloroform, methyl chloride, methylene chloride and little or no carbon tetrachloride, the amount of methylene chloride being substantially equal to the amount employed in the initial feed mixture and the amount of carbon tetrachloride corresponding to less than 0. 1 mole of chloroform in the product.

5534151, Jul 9, 1996

Jun 7, 1995

8/477744

Kung H. Lee - Chadds Ford PA

E. I. Du Pont de Nemours and Company - Wilmington DE

B01D 1500

210640

A process is disclosed for separating components of an azeotropic or azeotrope-like mixture containing only organic compounds at least one of which compound is a halocarbon comprising contacting said azeotropic or azeotrope-like mixture with a semipermeable membrane to form at least one exit stream having an increased concentration of at least one component and at least one other exit stream having an increased concentration of at least one other component of the azeotropic or azeotrope-like mixture and, thereafter, recovering at least one exit stream.