Christian Hoffmann

Author:

Christian Hoffmann

ISBN #:

2865866920

Author:

Christian Hoffmann

ISBN #:

2910729036

Author:

Christian Hoffmann

ISBN #:

3826019172

Author:

Christian Hoffmann

ISBN #:

3980341275

Author:

Christian H. Hoffmann

ISBN #:

3789271136

Author:

Christian H. Hoffmann

ISBN #:

3871980641

US Patent:

8012357, Sep 6, 2011

Filed:

Feb 17, 2005

Appl. No.:

11/060004

Inventors:

Benjamin C. Fuchs - Karlsruhe, DE
Christian Hoffmann - Newark DE, US
Karsten Keller - Hockessin DE, US
Christopher M. Rey - Hockessin DE, US

Assignee:

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

International Classification:

B01D 35/06
B03C 1/30

US Classification:

210695, 210702, 210806, 210223, 210297, 436523, 436524, 436526, 209 40, 209214, 209232

Abstract:

This invention relates to a continuous or batch centrifugation solid-liquid separation process comprising simultaneously subjecting the solid-liquid mixture to localized magnetic field gradients and the centrifugation and to improved centrifugation solid-liquid separation processes wherein the improvement comprises simultaneously subjecting the solid-liquid mixture to a homogeneous magnetic field, a magnetic field gradient or both prior to and/or during the centrifugation.

US Patent:

8075771, Dec 13, 2011

Filed:

Feb 14, 2006

Appl. No.:

11/353334

Inventors:

Benjamin Fuchs - Wilmington DE, US
Christian K. Hoffmann - Newark DE, US
Karsten Keller - Hockessin DE, US

Assignee:

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

International Classification:

B01D 35/06
B03C 1/30

US Classification:

210223, 210695, 210702, 210806, 210297, 436523, 436524, 436526, 209 40, 209214, 209232

Abstract:

This invention relates to apparatus for carrying out continuous or batch centrifugation solid-liquid separation processes in which the solid-liquid mixture is subjected to magnetic field gradients and centrifugation.

US Patent:

8119010, Feb 21, 2012

Filed:

Feb 17, 2005

Appl. No.:

11/060001

Inventors:

Karsten Keller - Hockessin DE, US
Christopher M. Rey - Hockessin DE, US
Benjamin Fuchs - Karlsruhe, DE
Christian Hoffmann - Newark DE, US

Assignee:

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

International Classification:

B01D 29/00
B01D 35/06

US Classification:

210695, 210223, 210702, 210767, 210771, 210800, 210806

Abstract:

This invention relates to an improved cake-filtration solid-liquid separation process wherein the improvement comprises simultaneously subjecting the solid-liquid mixture to a homogeneous magnetic field, a magnetic field gradient or both and cake-filtration to accomplish separation.

US Patent:

8143371, Mar 27, 2012

Filed:

Oct 31, 2008

Appl. No.:

12/262609

Inventors:

Mark Andrew Harmer - Landenberg PA, US
Christian Hoffmann - Newark DE, US
Scott Christopher Jackson - Wilmington DE, US
Edward R. Murphy - Wilmington DE, US
Rupert Spence - Kingston, CA

Assignee:

E I du Pont de Nemours and Company - Wilmington DE

International Classification:

C08F 6/06
C08F 6/12
C08G 65/34

US Classification:

528482, 528425, 528485, 528486, 528500, 528501, 528503, 528396

Abstract:

This invention relates to a process for preparing polytrimethylene ether glycols or copolymers thereof having a number-average molecular weight of at least about 250 g/mole by a polycondensation reaction using at least one acid catalyst.

US Patent:

8148491, Apr 3, 2012

Filed:

Oct 31, 2008

Appl. No.:

12/262626

Inventors:

David C. Confer - Chadds Ford PA, US
Mark Andrew Harmer - Landenberg PA, US
Christian Hoffmann - Newark DE, US
Scott Christopher Jackson - Wilmington DE, US
Sigridur Soley Kristjansdottir - Wilmington DE, US
Rupert Spence - Kingston, CA

Assignee:

E I du Pont de Nemours and Company - Wilmington DE

International Classification:

C08F 6/06
C08F 6/12
C08J 3/11
C08G 65/34

US Classification:

528503, 528425, 528499, 528502 R

Abstract:

This invention relates to a process for preparing polytrimethylene ether glycols or copolymers thereof by a polycondensation reaction using at least one acid catalyst, wherein the temperature of the reaction is controlled such that the average temperature during the first half of the reaction is higher than the average temperature during the second half of the reaction.

US Patent:

8344098, Jan 1, 2013

Filed:

Dec 17, 2010

Appl. No.:

12/971311

Inventors:

Christian Hoffmann - Newark DE, US
Scott Christopher Jackson - Wilmington DE, US
Edward R. Murphy - Wilmington DE, US
Bhuma Rajagopalan - Wilmington DE, US

Assignee:

E I du Pont de Nemours and Company - Wilmington DE

International Classification:

C08G 65/34

US Classification:

528425, 528256, 528679, 528620, 568623, 568620, 568679, 564505

Abstract:

Processes for producing polytrimethylene ether glycol and copolymers thereof are provided wherein, by condensing and recycling at least a portion of the vapor phase produced as the reaction progresses, the yield loss and polymer color are reduced.

US Patent:

20050261479, Nov 24, 2005

Filed:

Apr 20, 2005

Appl. No.:

11/110424

Inventors:

Christian Hoffmann - Newark DE, US
Karsten Keller - Hockessin DE, US

International Classification:

C07K014/435
C12P021/06
C12N005/06

US Classification:

530353000, 435348000, 435069100

Abstract:

A method for the purification of recombinant silk proteins from a sample using magnetic affinity separation is described. The recombinant silk protein is expressed with an affinity tag which has a high binding affinity for an affinity ligand immobilized on magnetic particles. In the method, the processes of clarification of the crude silk protein extract, concentration of the product and purification of the product are combined in a single step involving the affinity capture of the spider silk protein onto the magnetic particles directly from the extract. The product yields are improved due to the reduced number of steps in the purification process.

US Patent:

20070275101, Nov 29, 2007

Filed:

Feb 23, 2007

Appl. No.:

11/710325

Inventors:

Helen Lu - Wallingford PA, US
Christian Hoffmann - Newark DE, US
Christian Lenges - Wilmington DE, US
Lynn Leger - Mississauga, CA
Shaun Malone - Ajax, CA
Barry Stieglitz - Wynnewood PA, US
Judith Van Gorp - Wilmington DE, US

International Classification:

A01N 33/12
A01P 1/00
A01P 13/00
A01P 3/00

US Classification:

424719000, 106015050, 514642000

Abstract:

This invention relates to a method for controlling microorganisms comprising coating a surface with a removable, antimicrobial film-forming composition.