Dhiren D Patel

US Patent:

6852156, Feb 8, 2005

Filed:

May 23, 2001

Appl. No.:

09/863167

Inventors:

Michael J. Eiseman - Swarthmore PA, US
Robert Paul Held - Newark DE, US
James L. Hohman - Newark DE, US
Dhiren V. Patel - Hockessin DE, US
Harry Joseph Spinelli - Wilmington DE, US
Sandra L. Witman - Wilmington DE, US

Assignee:

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

International Classification:

C09D011/00
C09C001/44

US Classification:

106 316, 106 3165, 106 319, 106478

Abstract:

A process is provided in which a pigment is oxidated with ozone in an aqueous environment in which the mixture of ozone, water and pigment is subjected to a dispersive mixing operation; and/or the pH of the mixture is maintained in a range of 6-8, whereby the pigment is self-dispersing and preferably has an acid value of less than 3 μmoles/M. Pigments from this process and ink jet inks containing the self-dispersing pigments, are also provided.

US Patent:

54343151, Jul 18, 1995

Filed:

Feb 22, 1994

Appl. No.:

8/199399

Inventors:

Suriyanarayanan Dorai - Hockessin DE
William W. Goudie - Kennett Square PA
Sarah E. Ochsenhirt - Cincinnati OH
Dhiren V. Patel - Middletown DE
James R. Cavall - Newark DE

Assignee:

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

International Classification:

C07C 4311
C07C 4318

US Classification:

568621

Abstract:

Polyether glycols, especially poly(tetramethylene ether) glycols, having a narrow molecular weight distribution (e. g. , Mw/Mn=1. 2 to 1. 80), are made by a process which consists of separating the low molecular weight fraction in an ultrafiltration module. In these units, molten PTMEG is fed at temperatures in the range of 30. degree. to 150. degree. C. and pressures ranging between 25 and 1500 psi. The PTMEG retentate from the ultrafiltration unit is also characterized by water content

US Patent:

20210355299, Nov 18, 2021

Filed:

Mar 1, 2021

Appl. No.:

17/187968

Inventors:

- Rochester NY, US
DEAN M. FAKE - WILMINGTON DE, US
SCOTT M. HERKIMER - WILMINGTON DE, US
DHIREN V. PATEL - HOCKESSIN DE, US
TYLER D. PRITCHETT - BEAR DE, US

International Classification:

C08L 5/00
C08B 37/00

Abstract:

Disclosed herein are compositions comprising polysaccharide particles with an average size of about 0.1-10 mm. These particles comprise at least (i) about 50%-90% by weight water or an aqueous solution, and (ii) about 10%-50% by weight insoluble alpha-glucan, or an insoluble cationic ether thereof, comprising alpha-1,3-glycosidic linkages and having a weight-average degree of polymerization (DPw) of at least about 100. Further disclosed are methods of preparing these compositions, as well as systems for storing and/or moving them.

US Patent:

20200157320, May 21, 2020

Filed:

Jan 28, 2020

Appl. No.:

16/774040

Inventors:

- Wilmington DE, US
DEAN M. FAKE - WILMINGTON DE, US
SCOTT M. HERKIMER - WILMINGTON DE, US
DHIREN V. PATEL - HOCKESSIN DE, US
TYLER D. PRITCHETT - BEAR DE, US

International Classification:

C08L 5/00
C08B 37/00

Abstract:

Disclosed herein are compositions comprising polysaccharide particles with an average size of about 0.1-10 mm. These particles comprise at least (i) about 50%-90% by weight water or an aqueous solution, and (ii) about 10%-50% by weight insoluble alpha-glucan, or an insoluble cationic ether thereof, comprising alpha-1,3-glycosidic linkages and having a weight-average degree of polymerization (DPw) of at least about 100. Further disclosed are methods of preparing these compositions, as well as systems for storing and/or moving them.

US Patent:

20190112456, Apr 18, 2019

Filed:

Oct 12, 2018

Appl. No.:

16/158327

Inventors:

- Wilmington DE, US
DEAN M. FAKE - WILMINGTON DE, US
SCOTT M. HERKIMER - WILMINGTON DE, US
DHIREN V. PATEL - HOCKESSIN DE, US
TYLER D. PRITCHETT - BEAR DE, US

International Classification:

C08L 5/00

Abstract:

Disclosed herein are compositions comprising polysaccharide particles with an average size of about 0.1-10 mm. These particles comprise at least (i) about 50%-90% by weight water or an aqueous solution, and (ii) about 10%-50% by weight insoluble alpha-glucan, or an insoluble cationic ether thereof, comprising alpha-1,3-glycosidic linkages and having a weight-average degree of polymerization (DPw) of at least about 100. Further disclosed are methods of preparing these compositions, as well as systems for storing and/or moving them.