Huai Nan Cheng from Metairie, LA, age 78

Us Patents

Esterified Polysaccharide Products And B-Lactone Ring Opened Ketene Dimer Products Containing The Compositions, And Process Of Making The Same
view source
US Patent:

6528643, Mar 4, 2003
Filed:

May 5, 2000
Appl. No.:

09/564575
Inventors:

Huai N. Cheng - Wilmington DE
Qu Ming Gu - Hockessin DE
Assignee:

Hercules Incorporated - Wilmington DE
International Classification:

C07H 100
US Classification:

5361231, 536 187, 536 553, 536115
Abstract:

Product of esterified polysaccharides and the process of making such product. The process can be enzymatic where an enzyme is used as a catalyst for the reaction. The process can also be chemical where no enzyme is used. Novel products are obtained through lipase-catalyzed -lactone ring opening alcoholysis of ketene dimers and the process of making such compositions containing products.

Acetoacetylated Saccharides And Process Of Making The Same
view source
US Patent:

6528644, Mar 4, 2003
Filed:

Sep 26, 2001
Appl. No.:

09/963191
Inventors:

Peng George Wang - Troy MI
Wenhua Xie - Westland MI
Lei Qiao - Downington PA
Robert G. Nickol - Hockessin DE
Huai N. Cheng - Wilmington DE
Assignee:

Hercules Incorporated - Wilmington DE
International Classification:

C07H 100
US Classification:

536124, 536 111, 536 41, 5361231, 536102, 536107, 536 69, 435 74, 435101
Abstract:

A product of acetoacetylated saccharide and the process of making such a product. The process is enzymatic where an enzyme is used as a catalyst for the reaction. The enzymatic process provides better yields and milder process conditions compared to other chemical synthesis process without any enzyme.

Reduced Byproduct Polyamine-Epihalohydrin Resins
view source
US Patent:

6554961, Apr 29, 2003
Filed:

Jun 12, 2000
Appl. No.:

09/592681
Inventors:

Richard James Riehle - Wilmington DE
Anthony J. Allen - Wilmington DE
Michaela Hofbauer - Roosendaal, NL
Alfred Jacques Haandrikman - Amersfoort, NL
Ronald Busink - Bennekom, NL
Mark T. Crisp - Amersfoort, NL
John James Hoglen - Newark DE
Huai Nan Cheng - Wilmington DE
John Arthur Lapre - Ede, NL
Harold Jabloner - Landenburg PA
Assignee:

Hercules Incorporated - Wilmington DE
International Classification:

D21H 1755
US Classification:

1621643, 1621646, 524 17, 524422, 524608, 435262, 528486, 528487
Abstract:

Processes for rendering a polyamine-epihalohydrin resin storage stable, including processes that prepare a storage stable resin and/or processes that treat resins. A composition containing a polyamine-epihalohydrin resin which includes CPD-forming species can be treated with at least one agent under conditions to at least one of inhibit, reduce and remove the CPD-forming species to obtain a reduced CPD-forming resin so that a composition containing the reduced CPD-forming polyamine-epihalohydrin resin when stored for 2 weeks at 50Â C. , and a pH of about 2. 5 to 3. 5 contains less than about 250 ppm dry basis of CPD. The invention is also directed to a gelation storage stable reduced CPD-forming resin so that a composition containing the reduced CPD-forming polyamine-epihalohydrin resin, when stored at pH 1 for 24 hours at 50Â C. and measured at 24 hours, produces less than about 1000 ppm dry basis of CPD. A paper product containing the storage stable polyaminopolyamide-epihalohydrin resin, when corrected for adding at about a 1 wt % addition level of the polyaminopolyamide-epihalohydrin resin, contains less than about 250 ppb of CPD.

Esterified Polysaccharide Products And -Lactone Ring Opened Ketene Dimer Products Containing The Compositions, And Process Of Making The Same
view source
US Patent:

6624298, Sep 23, 2003
Filed:

Feb 6, 2002
Appl. No.:

10/068501
Inventors:

Huai N. Cheng - Wilmington DE
Qu Ming Gu - Hockessin DE
Assignee:

Hercules Incorporated - Wilmington DE
International Classification:

C07H 100
US Classification:

536 63, 536 111, 536 41, 536 30, 536 32, 536 56, 5361231, 536124
Abstract:

Esterified polysaccharides and the process of making such products are disclosed. The process can be enzymatic where an enzyme is used as a catalyst for the reaction. The process can also be chemical where no enzyme is used. Novel Products are obtained through lipase-catalyzed -lactone ring opening alcoholysis of ketene dimers and the process of making such compositions containing products.

Methyl Acrylate-Diamine Based Polyamide Resins And Processes For Producing The Same
view source
US Patent:

6667384, Dec 23, 2003
Filed:

Dec 27, 2001
Appl. No.:

10/032651
Inventors:

Qu-Ming Gu - Hockessin DE
Armin Michel - DE Amersfoort, NL
Huai Nan Cheng - Wilmington DE
William W. Maslanka - Landenberg PA
Ronald R. Staib - Wilmington DE
Assignee:

Hercules Incorporated - Wilmington DE
International Classification:

C08G 7300
US Classification:

528342, 528310, 528322, 528332, 524606, 524608, 525430, 525435, 525436, 1621576, 162158, 1621641, 1621646, 162167, 1621682, 162183, 162185, 162202
Abstract:

The present invention contemplates poly(aminoamide) pre-polymers, polyamide polymers, a multi-step process for the synthesis of these pre-polymers and polymers using acrylates and at least one monomer containing at least two primary amines, and the resins resulting from the reaction of the polymers with an epihalohydrin. These resins may be used as wet strength resins and creping aids in the papermaking industry as well as surface additives for wool.

Enzyme-Catalyzed Polyamides And Compositions And Processes Of Preparing And Using The Same
view source
US Patent:

6677427, Jan 13, 2004
Filed:

Jun 13, 2000
Appl. No.:

09/592730
Inventors:

Huai N. Cheng - Wilmington DE
Qu-Ming Gu - Hockessin DE
William W. Maslanka - Landenberg PA
Assignee:

Hercules Incorporated - Wilmington DE
International Classification:

C08G 6382
US Classification:

528310, 528328, 528170, 528272, 528274, 528322, 528341, 528342, 525 7, 525 71, 525 8, 525 541, 525430, 525435, 524606, 524607, 524608, 524800, 524845, 162100, 162111, 1621571, 1621573, 1621576, 1621643, 1621682, 162184, 162185
Abstract:

A polyamide, the enzymatic reaction product of at least one polyamine and diester, and processes for preparing and using the same. In addition, processes for preparing and using the enzymatic reaction product as creping adhesives and wet strength resins to make cellulose products.

Oxime-Linked Polysaccharides And Methods Of Preparing The Same
view source
US Patent:

6846923, Jan 25, 2005
Filed:

Sep 18, 2001
Appl. No.:

09/956742
Inventors:

Peng George Wang - Troy MI, US
Wenhua Xie - Westland MI, US
Lei Qiao - Downingtown PA, US
Huai N. Cheng - Wilmington DE, US
Dennis J. Murphy - Malvern PA, US
Qu-Ming Gu - Hockessin DE, US
Assignee:

Hercules, Inc. - Wilmington DE
International Classification:

C07H 504
C07H 506
C08B 3700
US Classification:

536 551, 536 187, 536 552, 536114, 5361231, 536126
Abstract:

Polysaccharides comprising one or more oxime linkages are provided. Methods for their preparation include the polycondensation of saccharides bearing oxime-forming substituents. In some embodiments, polymerization is conducted in the presence of galactose oxidase. The resulting oxime-linked polysaccharides have desirable properties and are useful in numerous applications including paper manufacturing and drug delivery vehicles.

Reduced By Product Polyamine-Epihalohydrin Resins
view source
US Patent:

7175740, Feb 13, 2007
Filed:

Mar 25, 2003
Appl. No.:

10/396155
Inventors:

Richard James Riehle - Wilmington DE, US
Anthony J. Allen - Wilmington DE, US
Michaela Hofbauer - Roosendaal, NL
Alfred Jacques Haandrikman - Amersfoort, NL
Ronald Busink - Bennekom, NL
Mark T. Crisp - Amersfoort, NL
John James Hoglen - Newark DE, US
Huai Nan Cheng - Wilmington DE, US
John Arthur Lapre - Ede, NL
Harold Jabloner - Landenburg PA, US
Assignee:

Hercules Incorporated - Wilmington DE
International Classification:

D21H 17/55
D21H 21/20
C08G 69/46
US Classification:

1621643, 1621646, 435262, 4352625, 524 17
Abstract:

Processes for rendering a polyamine-epihalohydrin resin storage stable, including processes that prepare a storage stable resin and/or processes that treat resins. A composition containing a polyamine-epihalohydrin resin which includes CPD-forming species can be treated with at least one agent under conditions to at least one of inhibit, reduce and remove the CPD-forming species to obtain a reduced CPD-forming resin so that a composition containing the reduced CPD-forming polyamine-epihalohydrin resin when stored for 2 weeks at 50 C. , and a pH of about 2. 5 to 3. 5 contains less than about 250 ppm dry basis of CPD. The invention is also directed to a gelation storage stable reduced CPD-forming resin so that a composition containing the reduced CPD-forming polyamine-epihalohydrin resin, when stored at pH 1 for 24 hours at 50 C. and measured at 24 hours, produces less than about 1000 ppm dry basis of CPD. A paper product containing the storage stable polyaminopolyamide-epihalohydrin resin, when corrected for adding at about a 1 wt % addition level of the polyaminopolyamide-epihalohydrin resin, contains less than about 250 ppb of CPD.

Medicine Doctors

Huai Y. Cheng

view source

Specialties:

Internal Medicine - Geriatrics

Work:

University Physicians At JABA
674 Hillsdale Dr STE 3, Charlottesville, VA 22901
4349641333 (phone)

Education:

Medical School
Xuzhou Med Coll, Xuzhou City, Jiangsu, China
Graduated: 1982

Conditions:

Acute Upper Respiratory Tract Infections
Alzheimer's Disease
Anemia
Anxiety Dissociative and Somatoform Disorders
Anxiety Phobic Disorders

Languages:

Chinese
English

Description:

Dr. Cheng graduated from the Xuzhou Med Coll, Xuzhou City, Jiangsu, China in 1982. He works in Charlottesville, VA and specializes in Internal Medicine - Geriatrics. Dr. Cheng is affiliated with University Of Virginia Medical Center.