Lei L Zhang

US Patent:

6359288, Mar 19, 2002

Filed:

Apr 22, 1998

Appl. No.:

09/064242

Inventors:

Jackie Y. Ying - Winchester MA
Zhibo Zhang - Cambridge MA
Lei Zhang - Cambridge MA
Mildred S. Dresselhaus - Arlington MA

Assignee:

Massachusetts Institute of Technology - Cambridge MA

International Classification:

H01L 2915

US Classification:

257 14, 257 9, 257 28, 205202, 428606, 428614, 428629, 4284722

Abstract:

An array of nanowires having a relatively constant diameter and techniques and apparatus for fabrication thereof are described. In one embodiment, a technique for melting a material under vacuum and followed by pressure injection of the molten material into the pores of a porous substrate produces continuous nanowires. In another embodiment, a technique to systematically change the channel diameter and channel packing density of an anodic alumina substrate includes the steps of anodizing an aluminum substrate with an electrolyte to provide an anodic aluminum oxide film having a pore with a wall surface composition which is different than aluminum oxide and etching the pore wall surface with an acid to affect at least one of the surface properties of the pore wall and the pore wall composition.

US Patent:

6441251, Aug 27, 2002

Filed:

Sep 4, 2001

Appl. No.:

09/946711

Inventors:

Doron Levin - Annandale NJ
Jose G. Santiesteban - Bethlehem PA
Lei Zhang - Bridgewater NJ

Assignee:

ExxonMobil Chemical Patents Inc. - Houston TX

International Classification:

C07C 3708

US Classification:

568798, 568385, 568485, 568741, 568754

Abstract:

A process for producing phenol and acetone from cumene hydroperoxide is described in which the cumene hydroperoxide is contacted with a solid-acid catalyst comprising an inorganic, porous, crystalline material, designated as M41S, exhibiting, after calcination, an x-ray diffraction pattern with at least one peak at a d-spacing greater than about 18 Angstrom Units with a relative intensity of 100 and a benzene adsorption capacity of greater than 15 grams of benzene per 100 grams of said material at 50 torr and 25Â C. , wherein said material comprises sulfonate functionality.

US Patent:

6577430, Jun 10, 2003

Filed:

May 14, 2001

Appl. No.:

09/853713

Inventors:

Guanghai Jin - Woburn MA 01801
Lei Zhang - Acton MA
Jing Zhao - Winchester MA

Assignee:

Guanghai Jin - Woburn MA

International Classification:

G02F 109

US Classification:

359280, 359281, 359320, 359324, 359484, 385 16, 385 22, 385 11, 385 18, 343756

Abstract:

The present invention provides improved optical switches in which no mechanical movement is required to direct optical pathways between plural fiber ports and light transmission is bi-directional. Advantageously, the inventive switches permit bi-directional light transmission. The inventive switches also incorporate light bending devices to allow two fibers to be coupled to the light beams using a single lens for compactness. In the inventive switch, an optical signal is spatially split into two polarized beams by a birefringent element, which passes through a polarization rotation device that comprises waveplates, walk-off elements, and an electrically controllable polarization rotator, and recombine into an output fiber, achieving polarization independent operation. The switches of the present invention rely on electro-magnetically or electro-optically switching the beam polarizations from one state to another to rapidly direct the light path.

US Patent:

7453018, Nov 18, 2008

Filed:

Nov 12, 2004

Appl. No.:

10/987324

Inventors:

Jihad Mohammed Dakka - Whitehouse Station NJ, US
John Scott Buchanan - Lambertville NJ, US
Robert Andrew Crane - Hellertown PA, US
Christine Nicole Elia - Bridgewater NJ, US
Xiaobing Feng - Houston TX, US
Larry Lee Iaccino - Seabrook TX, US
Gary David Mohr - Houston TX, US
Brenda Anne Raich - Annandale NJ, US
Lei Zhang - Bridgewater NJ, US

Assignee:

ExxonMobil Chemical Patents Inc. - Houston TX

International Classification:

C07C 2/66

US Classification:

585467

Abstract:

This invention relates to a process for the selective alkylation of toluene and/or benzene with an oxygen-containing alkylation agent. In particular, the process uses a selectivated molecular sieve which has been modified by the addition of a hydrogenation component, wherein at least one of the following conditions is met: (a) the selectivated molecular sieve has an alpha value of less than 100 prior to the addition of the hydrogenation component, or (b) the selectivated and hydrogenated catalyst has an alpha value of less than 100. The process of this invention provides high selectivity for the alkylated product while reducing catalyst degradation.

US Patent:

7641786, Jan 5, 2010

Filed:

Nov 14, 2005

Appl. No.:

11/667235

Inventors:

Frank Cheng-Yu Wang - Annandale NJ, US
Lei Zhang - Vienna VA, US

Assignee:

ExxonMobil Research and Engineering Company - Annandale NJ

International Classification:

G01N 30/46
G01N 30/06

US Classification:

208 33, 208 18, 208 20, 208 24, 436 33, 436 40, 436 60

Abstract:

The invention relates to a method for analyzing a lubricating oil for low temperature properties. The method utilizes 2-dimensional gas chromatography (2D GC) to determine the amounts of paraffins and isoparaffins in the oil. In particular, the method analyzes for a particular isoparaffin fraction which is correlated to low temperature performance. The compositional information thus obtained is correlated with formulated oil Mini Rotary Viscometer (MRV) properties.

US Patent:

7642095, Jan 5, 2010

Filed:

Nov 14, 2005

Appl. No.:

11/667234

Inventors:

Frank Cheng-Yu Wang - Annandale NJ, US
Lei Zhang - Vienna VA, US

Assignee:

ExxonMobil Research and Engineering Company - Annandale NJ

International Classification:

G01N 30/06
G01N 30/46

US Classification:

436 60, 436 33, 436 40, 208 18, 208 20, 208 24, 208 33

Abstract:

A process for producing lube basestocks involving solvent dewaxing a waxy feed to produce at least a partially dewaxed lube oil boiling range stream and then hydrodewaxing the partially dewaxed lube oil boiling range stream to produce a lube basestock.

US Patent:

7705307, Apr 27, 2010

Filed:

Feb 27, 2007

Appl. No.:

11/711275

Inventors:

Jing Zhao - Winchester MA, US
Lei Zhang - Acton MA, US

Assignee:

Agiltron Corporation - Woburn MA

International Classification:

B41J 2/05

US Classification:

2503381

Abstract:

A radiation detector comprises an infrared radiation sensing micro mirror array, where each micro mirror is supported with a deformable cantilever beam having an organic layer for increased dynamic range. The radiation detector includes two or more sources of optical radiation for irradiating the micro mirror array, an image sensor array for receiving optical reflection from the micro mirror array, and an aperture plate for (i) spatially restricting optical radiation reaching the micro mirror array and (ii) spatially restricting reflected optical reflection reaching the image sensor array.

US Patent:

7705309, Apr 27, 2010

Filed:

Apr 8, 2008

Appl. No.:

12/082007

Inventors:

Guanghai Jin - Boxborough MA, US
Lei Zhang - Acton MA, US
Jing Zhao - Winchester MA, US

Assignee:

Agiltron Corporation - Woburn MA

International Classification:

H01L 25/00

US Classification:

2503381, 250332, 250352, 250330, 25037008, 25037001

Abstract:

A mechanical-optical transducer comprises a readout illumination source providing light having different wavelengths or different polarization states; an image sensor array for sensing the light from the readout illumination source; and a mechanical-optical device including sensing pixels whose optical property change in response to incident thermal infrared radiation, the mechanical-optical device having a reflective surface disposed to selectively reflect light from the readout illumination source to the image sensor array.