Charles A Little

US Patent:

7214806, May 8, 2007

Filed:

Mar 8, 2004

Appl. No.:

10/795772

Inventors:

Weilian Lang - Austin TX, US
Charles Little - Austin TX, US
Victor van de Pas - Zaltbommel, NL

Assignee:

Sachem, Inc. - Austin TX

International Classification:

C07D 303/08
C07C 211/00

US Classification:

549551, 564290, 564295, 210700

Abstract:

This invention pertains to novel multiple quaternary ammonium salts and their derivatives represented by the formula:This invention also pertains to novel multiple quaternary ammonium salts and their derivatives represented by the formula:.

US Patent:

7632409, Dec 15, 2009

Filed:

Oct 23, 2006

Appl. No.:

11/551765

Inventors:

Charles Little - Austin TX, US
Victor van de Pas - Zalthommel, NL
Barry Haymore - Austin TX, US

Assignee:

SACHEM, Inc. - Austin TX

International Classification:

B01D 15/08

US Classification:

210635, 210656, 210659, 2101982, 530413, 530416, 530417

Abstract:

A displacement chromatography process and displacer compounds used in the process and having the general formula (I):.

US Patent:

8496835, Jul 30, 2013

Filed:

Nov 30, 2006

Appl. No.:

11/564951

Inventors:

Charles Little - Austin TX, US
Barry L. Haymore - Austin TX, US

Assignee:

Sachem, Inc. - Austin TX

International Classification:

B01D 15/08
C02F 1/28
G01N 30/02

US Classification:

210656, 2101982, 422 70

Abstract:

A displacement chromatography process, including: loading onto a stationary phase comprising an anion-exchange material a mixture comprising one or more components to be separated; and displacing at least one of the one or more components from the stationary phase by applying to the stationary phase a mixture comprising an polyaromatic polyanionic displacer compound having a general formula Cen(Ar), in which Cen is a central bond or group, Ar is an aromatic nucleus, w=2 to the maximum number of sites one Cen, and Ar is substituted with a plurality of An, in which each Anis independently defined as sulfonate, carboxylate, phosphonate, phosphate, sulfate; and Ar is further substituted with a plurality of G, in which G is defined as independently H, C-Calkyl, halogen, nitro, hydroxy, or C-Calkoxy. In addition, a group of polyaromatic polyanionic displacer compounds useful in the process is disclosed.

US Patent:

20100081844, Apr 1, 2010

Filed:

Dec 4, 2009

Appl. No.:

12/630985

Inventors:

Charles Little - Austin TX, US
Victor van de Pas - Zalthommel, NL
Barry Haymore - Austin TX, US

International Classification:

C07C 211/00

US Classification:

564290

Abstract:

A chemical compound having the general formula (I):wherein:

US Patent:

20130261039, Oct 3, 2013

Filed:

Mar 27, 2012

Appl. No.:

13/430985

Inventors:

Charles B. Little - Austin TX, US

Assignee:

SACHEM, INC. - Austin TX

International Classification:

C11D 3/60
C07C 217/28
C07C 215/40
C07D 487/08
C07C 215/28
C07C 217/48
C07D 295/108
C11D 3/43
C07D 207/04

US Classification:

510175, 564293, 548574, 564285, 544177, 544398, 544351

Abstract:

A method of removing a residue from a surface, including applying to the surface a composition including (a) a quaternary ammonium hydroxide having a general formula (I):as defined herein, and

US Patent:

20220380519, Dec 1, 2022

Filed:

May 4, 2022

Appl. No.:

17/736537

Inventors:

- Austin TX, US
Sara S. Moghaddam - Dripping Springs TX, US
Charles B. Little - Austin TX, US
Ari K. Kar - Bee Cave TX, US

International Classification:

C08G 59/14
C02F 1/62

Abstract:

A metal-chelating resin includes (a) a compound represented by Formula (I):or a stereoisomeric form thereof or a salt thereof, wherein R, R, R, R, R, R, Rand Rare as defined herein; and (b) an organic polymer resin having at least one complementary reactive functional group covalently linked with at least one linking group of the compound represented by Formula (I).

US Patent:

20220380520, Dec 1, 2022

Filed:

May 4, 2022

Appl. No.:

17/736559

Inventors:

- Austin TX, US
Sara S. Moghaddam - Dripping Springs TX, US
Charles B. Little - Austin TX, US
Ari K. Kar - Bee Cave TX, US

International Classification:

C08G 59/14
C02F 1/62

Abstract:

A metal-chelating resin includes (a) a compound represented by Formula (I):or a stereoisomeric form thereof or a salt thereof, wherein R, R, R, R, R, R, Rand Rare as defined herein; and (b) an organic polymer resin having at least one complementary reactive functional group covalently linked with at least one linking group of the compound represented by Formula (I).

US Patent:

20200115247, Apr 16, 2020

Filed:

Jun 19, 2018

Appl. No.:

16/622977

Inventors:

- Austin TX, US
Charles B. LITTLE - Austin TX, US

International Classification:

C01B 39/02
C01B 39/48
B01J 29/70

Abstract:

A process for making SSZ-39 zeolite employing at least one organic structure-directing agent (OSDA), in which a substantial quantity of the at least one OSDA, which otherwise would be required to form a zeolite such as SSZ-39, is replaced by at least one quaternary ammonium or phosphonium compound (PFA) or a mixture of two or more thereof that is not itself an OSDA for making SSZ-39. A composition including at least one oxide of silicon; faujasite; at least one organic structure directing agent (OSDA) for making SSZ-39 zeolite; at least one PFA that is not an OSDA for making SSZ-39 zeolite; an alkali metal hydroxide; and water.