David Scott Zimmerman

US Patent:

7247200, Jul 24, 2007

Filed:

Nov 1, 2005

Appl. No.:

11/263702

Inventors:

Alan Roger Eaton - Hendersonville TN, US
Narayanan Sankara Subramanian - Hockessin DE, US
Stephen William Taylor - Chadds Ford PA, US
George A. Schurr - Newark DE, US
David A Zimmerman - Wilmington DE, US

Assignee:

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

International Classification:

C09C 1/36
C09C 3/04
C01G 23/047

US Classification:

106437, 106436, 423610, 423611, 423612

Abstract:

This disclosure relates to process for producing titanium dioxide (TiO) pigments, comprising the following steps: a) oxidizing a mixture of titanium tetrahalide and a rutile forming agent, such as aluminum halide, present in the vapor phase and in the presence of a nucleant to form a gaseous suspension comprising titanium dioxide particles; b) passing the gaseous suspension to a cooling conduit; c) introducing scouring material into the cooling conduit; wherein the particles of the scouring material have a diameter in the range of about 0. 25 mm to about 12. 7 mm; d) separating the vapor phase to form a powder comprising the titanium dioxide particles and the scouring material; and e) simultaneously subjecting the powder to substantially uniform heating at a temperature of about 300 C. to about 600 C. and reducing the size of the titanium dioxide particles and the particles of the scouring material in the powder to a mean particle size of about 50 nm to about 1000 nm, whereby the titanium dioxide pigment has a chloride content of less than about 500 ppm.

US Patent:

20060133985, Jun 22, 2006

Filed:

Dec 12, 2003

Appl. No.:

10/538356

Inventors:

Thomas Buller - Diamondhead MS, US
Stephen Lyke - Wilmington DE, US
Aaron Becker - Wilmington DE, US
Stephan De La Veaux - Wilmington DE, US
Russell Diemer - Wilmington DE, US
James Dunson Jr. - Newark DE, US
James Tilton - Landenberg PA, US
David Zimmerman - Wilmington DE, US
Stephen Hallock - Newark DE, US

International Classification:

C01B 7/00
B01J 8/04

US Classification:

423500000, 422196000, 422224000

Abstract:

The present invention relates to a process for recovering chlorine from a feed stream containing metal chlorides using a tubular reactor wherein a hot oxygen containing gas has an initial velocity such that the resulting velocity of the bulk gas formed from mixing the oxygen containing gas with the metal chloride feed stream and a scrubs feed stream is sufficient to remove wall deposits as fast as such deposits are formed.

US Patent:

57595119, Jun 2, 1998

Filed:

Aug 26, 1996

Appl. No.:

8/703303

Inventors:

Russell Bertrum Diemer - Wilmington DE
Narayanan Sankara Subramanian - Hockessin DE
David A. Zimmerman - Wilmington DE

Assignee:

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

International Classification:

C01G 23047

US Classification:

423613

Abstract:

This invention relates to an improved process for making titanium dioxide pigment, wherein granular scouring particles (scrubs) comprising specific water-soluble salts (KCl, CsCl, or mixtures thereof) are introduced into a cooling conduit containing a hot gaseous suspension of titanium dioxide particulate. The process provides titanium dioxide pigment having higher carbon black undertone (CBU) levels.

US Patent:

6036999, Mar 14, 2000

Filed:

Jul 3, 1997

Appl. No.:

8/887552

Inventors:

Qian Qiu Zhao - Landenberg PA
David Allen Zimmerman - Wilmington DE

International Classification:

B05D 700
B05D 302
C23C 1640

US Classification:

427215

Abstract:

This invention relates to methods of preparing grinding media consisting essentially of sintered titanium dioxide (TiO. sub. 2) particles. The method involves preparing base TiO. sub. 2 particles, coating the base TiO. sub. 2 particles with at least one hydrous oxide, compressing the TiO. sub. 2 particles, and granulating the TiO. sub. 2 particles to form TiO. sub. 2 particles having substantially rounded edges. The invention further encompasses the resulting grinding media prepared by such methods and to methods of using such grinding media in media-milling particulate material such as titanium dioxide pigments.

US Patent:

20190291383, Sep 26, 2019

Filed:

Jun 10, 2019

Appl. No.:

16/435867

Inventors:

- Southfield MI, US
DAVID ZIMMERMAN - WEST CHESTER PA, US

International Classification:

B32B 5/02
D03D 1/00
B32B 7/12
B32B 37/14
B32B 5/26
D03D 15/00
B32B 15/04
B32B 15/14
B32B 3/04

Abstract:

A wrappable textile sleeve and method of construction thereof is provided. The sleeve includes a woven wall having opposite inner and outer edges extending in a lengthwise direction along a central longitudinal axis of the sleeve between opposite ends. The opposite inner and outer edges are wrappable into overlapping relation with one another to form an inner tubular cavity. The wall has an innermost woven layer and an outermost woven layer woven in attached relation with one another at one of the opposite inner and outer edges. A reflective layer is sandwiched between the innermost woven layer and the outermost woven layer, such that the outermost woven layer protects the underlying reflective layer against abrasion.

US Patent:

20160016376, Jan 21, 2016

Filed:

Jul 16, 2015

Appl. No.:

14/801175

Inventors:

- Southfield MI, US
David Zimmerman - West Chester PA, US

International Classification:

B32B 5/02
B32B 37/14
B32B 3/04
B32B 15/14
B32B 5/24

Abstract:

A wrappable textile sleeve and method of construction thereof is provided. The sleeve includes a woven wall having opposite inner and outer edges extending in a lengthwise direction along a central longitudinal axis of the sleeve between opposite ends. The opposite inner and outer edges are wrappable into overlapping relation with one another to form an inner tubular cavity. The wall has an innermost woven layer and an outermost woven layer woven in attached relation with one another at one of the opposite inner and outer edges. A reflective layer is sandwiched between the innermost woven layer and the outermost woven layer, such that the outermost woven layer protects the underlying reflective layer against abrasion.