Hui C Du

US Patent:

7892872, Feb 22, 2011

Filed:

Jan 2, 2008

Appl. No.:

12/006459

Inventors:

Henry Hieslmair - San Francisco CA, US
Shivkumar Chiruvolu - San Jose CA, US
Hui Du - Sunnyvale CA, US

Assignee:

NanoGram Corporation - Milpitas CA

International Classification:

H01L 21/00
H01L 29/06

US Classification:

438 45, 977773, 977774, 977786, 257 28, 257 65, 257E33017, 257E33039, 4272133, 4273884, 429503

Abstract:

Highly uniform silica nanoparticles can be formed into stable dispersions with a desirable small secondary particle size. The silican particles can be surface modified to form the dispersions. The silica nanoparticles can be doped to change the particle properties and/or to provide dopant for subsequent transfer to other materials. The dispersions can be printed as an ink for appropriate applications. The dispersions can be used to selectively dope semiconductor materials such as for the formation of photovoltaic cells or for the formation of printed electronic circuits.

US Patent:

7972691, Jul 5, 2011

Filed:

Dec 22, 2006

Appl. No.:

11/645084

Inventors:

Shivkumar Chiruvolu - San Jose CA, US
Hui Du - Sunnyvale CA, US
Nobuyuki Kambe - Menlo Park CA, US

Assignee:

NanoGram Corporation - Milpitas CA

International Classification:

B32B 5/16
H01B 1/00

US Classification:

428338, 428328, 252500

Abstract:

Successful dispersion approaches are described for the formation of dispersion of dry powders of inorganic particles. In some embodiments, it is desirable to form the dispersion in two processing steps in which the particles are surface modified in the second processing step. Composites can be formed using the well dispersed particles to form improved inorganic particle-polymer composites. These composites are suitable for optical applications and for forming transparent films, which can have a relatively high index or refraction. In some embodiments, water can be used to alter the surface chemistry of metal oxide particles.

US Patent:

8119233, Feb 21, 2012

Filed:

Feb 14, 2008

Appl. No.:

12/070063

Inventors:

Shivkumar Chiruvolu - San Jose CA, US
Vladimir K. Dioumaev - Mountain View CA, US
Nobuyuki Kambe - Menlo Park CA, US
Hui Du - Sunnyvale CA, US

Assignee:

NanoGram Corporation - Milpitas CA

International Classification:

C08K 3/02
C08K 3/08

US Classification:

428331, 428323, 524442, 524476, 524570

Abstract:

Functional composite materials comprise elemental inorganic particles within an organic matrix. The elemental inorganic materials generally comprise elemental metal, elemental metalloid, alloys thereof, or mixtures thereof. In alternative or additional embodiments, the inorganic particles can comprise a metal oxide, a metalloid oxide, a combination thereof or a mixture thereof. The inorganic particles can have an average primary particle size of no more than abut 250 nm and a secondary particle size in a dispersion when blended with the organic matrix of no more than about 2 microns. The particles can be substantially unagglomerated within the composite. The organic binder can be a functional polymer such as a semiconducting polymer. The inorganic particles can be surface modified, such as with a moiety having an aromatic functional group for desirable interactions with a semiconducting polymer. Appropriate solution based methods can be used for forming the composite from dispersions of the particles.

US Patent:

8263423, Sep 11, 2012

Filed:

Jul 26, 2011

Appl. No.:

13/191392

Inventors:

Henry Hieslmair - San Francisco CA, US
Shivkumar Chiruvolu - San Jose CA, US
Hui Du - Sunnyvale CA, US

Assignee:

NanoGram Corporation - Milpitas CA

International Classification:

H01L 21/00

US Classification:

438 45, 438500, 438501, 438933, 257E29297, 257E33017, 257E33039, 977773, 977774, 977786

Abstract:

Highly uniform silica nanoparticles can be formed into stable dispersions with a desirable small secondary particle size. The silican particles can be surface modified to form the dispersions. The silica nanoparticles can be doped to change the particle properties and/or to provide dopant for subsequent transfer to other materials. The dispersions can be printed as an ink for appropriate applications. The dispersions can be used to selectively dope semiconductor materials such as for the formation of photovoltaic cells or for the formation of printed electronic circuits.

US Patent:

8314176, Nov 20, 2012

Filed:

Dec 31, 2009

Appl. No.:

12/650778

Inventors:

Hui Du - Sunnyvale CA, US
Shivkumar Chiruvolu - San Jose CA, US

Assignee:

NanoGram Corporation - Milpitas CA

International Classification:

C08K 3/22
C08K 3/28

US Classification:

524428, 524430

Abstract:

Desirable composites of polysiloxane polymers and inorganic nanoparticles can be formed based on the appropriate selection of the surface properties of the particles and the chemical properties of the polymer. High loadings of particles can be achieved with good dispersion through the polymer. The composites can have good optical properties. In some embodiments, the inorganic particles are substantially free of surface modification.

US Patent:

8363306, Jan 29, 2013

Filed:

Apr 4, 2011

Appl. No.:

13/079607

Inventors:

Hui Du - Milpitas CA, US
Xiaojia Wang - Fremont CA, US
HongMei Zang - Sunnyvale CA, US
Haiyan Gu - Fremont CA, US

Assignee:

SiPix Imaging, Inc. - Fremont CA

International Classification:

G02B 26/00
B05D 1/36
G03G 17/04

US Classification:

359296, 4274071, 430 32

Abstract:

The present invention is directed to an electrophoretic display fluid, in particular, pigment particles dispersed in a solvent or solvent mixture, and methods for their preparation. The pigment particles generated, according to the present invention, are stable in solvent under an electric field, have desired charge and charge density on the particle surface.

US Patent:

8399878, Mar 19, 2013

Filed:

Aug 27, 2012

Appl. No.:

13/595234

Inventors:

Henry Hieslmair - San Francisco CA, US
Shivkumar Chiruvolu - San Jose CA, US
Hui Du - Sunnyvale CA, US

Assignee:

NanoGram Corporation - Milpitas CA

International Classification:

H01L 33/00
H01L 29/786

US Classification:

257 19, 257 65, 257E33017, 257E33039, 257E29297, 438933, 977773

Abstract:

Highly uniform silica nanoparticles can be formed into stable dispersions with a desirable small secondary particle size. The silica particles can be surface modified to form the dispersions. The silica nanoparticles can be doped to change the particle properties and/or to provide dopant for subsequent transfer to other materials. The dispersions can be printed as an ink for appropriate applications. The dispersions can be used to selectively dope semiconductor materials such as for the formation of photovoltaic cells or for the formation of printed electronic circuits.

US Patent:

8404771, Mar 26, 2013

Filed:

Jul 26, 2012

Appl. No.:

13/559085

Inventors:

Hui Du - Sunnyvale CA, US
Shivkumar Chiruvolu - San Jose CA, US

Assignee:

NanoGram Corporation - Milpitas CA

International Classification:

C08K 3/22
C08K 3/28

US Classification:

524428, 524430

Abstract:

Desirable composites of polysiloxane polymers and inorganic nanoparticles can be formed based on the appropriate selection of the surface properties of the particles and the chemical properties of the polymer. High loadings of particles can be achieved with good dispersion through the polymer. The composites can have good optical properties. In some embodiments, the inorganic particles are substantially free of surface modification.