Eshan B Yeh

US Patent:

7537718, May 26, 2009

Filed:

Oct 13, 2005

Appl. No.:

11/250134

Inventors:

Michael Mezhirov - Bridgeport CT, US
Eshan B. Yeh - West Hartford CT, US
Richard Sale - Tolland CT, US

Assignee:

3M Innovative Properties Company - Saint Paul MN

International Classification:

B01D 39/00
B01D 67/00

US Classification:

264 48, 264 49, 21050041, 210490

Abstract:

The present disclosure relates to improved efficient and effective systems and methods of manufacturing hydrophilic polyethersulfone (PES) membrane suitable for commercial applications and the resultant hydrophilic polyethersulfone (PES) membrane suitable for commercial applications produced thereby and includes methods of manufacturing hydrophilic polyethersulfone (PES) membrane comprising the acts of: providing hydrophobic PES membrane; prewetting the hydrophobic PES membrane in a sufficient amount of a liquid having a sufficiently low surface tension; exposing the wet hydrophobic PES membrane to a sufficient amount of an aqueous solution of oxidizer; and after the exposing act, heating the hydrophobic PES membrane for a sufficient time at a sufficient temperature and methods of manufacturing hydrophilic polyethersulfone (PES) membrane comprising the acts of: providing gel PES membrane; exposing the gel PES membrane to a sufficient amount of an aqueous solution of oxidizer; and after the exposing act, heating the hydrophobic PES membrane for a sufficient time at a sufficient temperature and the resulting products.

US Patent:

8123959, Feb 28, 2012

Filed:

Nov 25, 2008

Appl. No.:

12/277665

Inventors:

Eshan B. Yeh - Hartford CT, US
Keith D. Solomon - Cheshire CT, US

Assignee:

3M Innovative Properties Company - St. Paul MN

International Classification:

C02F 1/50
B05D 1/00

US Classification:

210764, 210501, 210506, 427220, 427375, 427384, 427424

Abstract:

Provided are methods of modifying solid particles with functional agents to provide anti-microbial media. The anti-microbial media comprise a surface-modified inorganic component which is a reaction product of an anti-microbial component and an inorganic component. Methods of making the media include agitating inorganic base material in a processing tank substantially simultaneously with spraying the anti-microbial component into the processing tank to form a coated base material. Methods of making the media also include maintaining a ratio of the anti-microbial component to the inorganic component such that the coated base material is below its compaction point. Methods of use are also provided.

US Patent:

8425814, Apr 23, 2013

Filed:

May 21, 2009

Appl. No.:

12/469934

Inventors:

Michael Mezhirov - Bridgeport CT, US
Eshan B. Yeh - West Hartford CT, US
Richard Sale - Tolland CT, US

Assignee:

3M Innovative Properties Company - St. Paul MN

International Classification:

B01D 67/00
B01D 39/00
B01D 71/00

US Classification:

264 48, 264 41, 21050041

Abstract:

The present disclosure relates to improved efficient and effective systems and methods of manufacturing hydrophilic polyethersulfone (PES) membrane suitable for commercial applications and the resultant hydrophilic polyethersulfone (PES) membrane suitable for commercial applications produced thereby and includes methods of manufacturing hydrophilic polyethersulfone (PES) membrane comprising the acts of: providing hydrophobic PES membrane; prewetting the hydrophobic PES membrane in a sufficient amount of a liquid having a sufficiently low surface tension; exposing the wet hydrophobic PES membrane to a sufficient amount of an aqueous solution of oxidizer; and after the exposing act, heating the hydrophobic PES membrane for a sufficient time at a sufficient temperature and methods of manufacturing hydrophilic polyethersulfone (PES) membrane comprising the acts of: providing gel PES membrane; exposing the gel PES membrane to a sufficient amount of an aqueous solution of oxidizer; and after the exposing act, heating the hydrophobic PES membrane for a sufficient time at a sufficient temperature and the resulting products.

US Patent:

8453849, Jun 4, 2013

Filed:

Nov 25, 2008

Appl. No.:

12/744392

Inventors:

Thomas J. Hamlin - Vernon CT, US
Mark T. Meyering - Middletown CT, US
Hemang R. Patel - Middletown CT, US
Derek A. Daigle - New Haven CT, US
Robert A. Governal - Tuscon AZ, US
Rebecca A. Lucht - Cromwell CT, US
Keith D. Solomon - Cheshire CT, US
Eshan B. Yeh - Hartford CT, US

Assignee:

3M Innovative Properties Company - St. Paul MN

International Classification:

B01D 24/00

US Classification:

210503, 210509, 2105101

Abstract:

Provided are an anti-microbial matrix and filtration systems containing the same. The matrix comprises a surface-modified inorganic component and a polymeric binder comprising particles having an irregular, convoluted surface. The surface-modified inorganic component comprises a reaction product of an anti-microbial component and an inorganic component. The anti-microbial component comprises a quaternary ammonium salt containing an epoxide group. A covalent bond is, for example, between the quaternary ammonium cation and a hydroxyl group of the inorganic component. The quaternary ammonium salt can be poly(methyldiallylamine epichlorohydrin). Further, the quaternary ammonium salt can have the formula according to I: (Formula I), wherein n is in the range of 5 to 24. The inorganic component can be diatomaceous earth. The polymeric binder can comprise ultra high molecular weight polyethylene (UHMW PE).

US Patent:

20020155225, Oct 24, 2002

Filed:

Aug 6, 2001

Appl. No.:

09/922879

Inventors:

Eshan Yeh - Unionville CT, US
Eugene Ostreicher - Farmington CT, US
Richard Sale - Tolland CT, US
Marjorie Bucholz - Meriden CT, US

International Classification:

B05D003/02
B05D001/18
B05D001/36
B05D003/10

US Classification:

427/407100, 427/299000, 427/322000, 427/430100, 427/384000

Abstract:

A method for producing charge-modified polyester comprising treating the polyester with at least one agent sufficient to cause hydrolysis of the polyester and a charge-modifier having one or more epoxy groups with a fixed formal charge, resulting in the formation of a bond between the one or more epoxy groups and the polyester. The polyester may be treated with the agent, which is presently preferred to be an alkaline, amine, or combination of both, and charge-modifier, which could have a positive or negative charge.

US Patent:

20040134851, Jul 15, 2004

Filed:

Jul 24, 2003

Appl. No.:

10/625921

Inventors:

Jeffrey Lucas - Clinton CT, US
Anna Bailey - Wallingford CT, US
Eshan Yeh - Unionville CT, US

International Classification:

B01D029/11

US Classification:

210/497010, 210/506000

Abstract:

Fluid filtration devices that include nylon membranes are provided according to the present disclosure that maintain thorough wetting of a membrane through the end cap bonding process. The fluid filtration device typically includes a pleated microporous nylon filter media and polypropylene end caps. The pleated microporous filter media is treated with hydrophilic polymeric surface treatments at the ends thereof prior to contact with molten polypropylene end caps, thereby maintaining the ability to integrity test the filtration device in water. Exemplary polymeric surface treatments include solutions and dispersions of polyvinyl alcohol, polyethyleneimine, a combination of 1-4 butanediol diglycidyl ether and ethylene amine, and a quaternary amine polyepichlorohydrin.

US Patent:

20040195172, Oct 7, 2004

Filed:

Apr 1, 2003

Appl. No.:

10/404968

Inventors:

Eshan Yeh - Unionville CT, US
Michael Mezhirov - Bridgeport CT, US

International Classification:

B01D069/10

US Classification:

210/490000, 210/489000, 210/500210, 210/500350

Abstract:

A process for imparting hydrophilic properties to a polymeric membrane by exposing the membrane to an acrylate monomer containing hydrophilic segments, such as ethylene oxide, and a hydrophilic functional group, a diacrylate monomer containing hydrophilic functional groups, and an initiator for facilitating crosslinking and polymerization reactions.

US Patent:

20050211635, Sep 29, 2005

Filed:

Mar 23, 2005

Appl. No.:

11/089258

Inventors:

Eshan Yeh - Unionville CT, US
Robert Governal - Middletown CT, US
Thomas Hamlin - Vernon CT, US
Hemang Patel - Wallingford CT, US
Marjorie Bucholz - Meriden CT, US

International Classification:

B01D021/01
C02F001/52

US Classification:

210732000

Abstract:

An improved fluid filtration media having anti-microbial properties and methods for producing and utilizing improved fluid filtration media having anti-microbial properties and employing the same in fluid filtration applications wherein one representative separation media for fluids comprises a base mixture of organic and inorganic components comprising at least one anti-microbial component; and at least one component of the base mixture comprises a charge-modified group covalently bonded to the surface of the at least one anti-microbial component is disclosed.