Rahul K Gupta

US Patent:

6963081, Nov 8, 2005

Filed:

Sep 30, 2003

Appl. No.:

10/676969

Inventors:

Rahul Gupta - Santa Clara CA, US
Florian Pschenitzka - San Jose CA, US
Vi-En Choong - San Jose CA, US
Pierre-Marc Allemand - San Jose CA, US

Assignee:

Osram Otpo Semiconductors GmbH - Regensburg

International Classification:

H01L035/24
H01L051/00
H01L029/24
H01L029/167
H01L029/207

US Classification:

257 40, 257102, 257103, 257607

Abstract:

In an embodiment of the invention, an electronic device includes an interfacial layer with traps. This interfacial layer is between an electrode and an organic layer, and if the electrode was adjacent to the organic layer, the energy barrier between these two layers is such that the current through the organic layer is limited by charge injection into this layer rather than the transport properties of the organic layer. The traps are used to accumulate charges of one charge type (e. g. , either electrons or holes) within the interfacial layer. By accumulating charges, the bands of the interfacial layer are bent so that charges can tunnel from the electrode to the organic layer thus increasing the efficiency of the electronic device and allowing organic layers to be used within an electronic device that otherwise would be too inefficient for use in that device.

US Patent:

7022534, Apr 4, 2006

Filed:

Jan 14, 2004

Appl. No.:

10/758430

Inventors:

Rahul Gupta - Milpitas CA, US
Andrew Ingle - Fremont CA, US
Sriram Natarajan - Burlingame CA, US

Assignee:

Osram Opto Semiconductors GmbH - Regensburg

International Classification:

H01L 21/00

US Classification:

438 21, 257 40

Abstract:

The height of the photo-resist layer “banks” which define pockets for inkjet printing or other patterned processes is optimized to provide a more uniform drying profile for substances which are to be deposited in those pockets and dried therein. Preferably, the height of the photo-resist layer is less than or equal to about three microns and more, preferably, about one micron.

US Patent:

7132788, Nov 7, 2006

Filed:

Sep 9, 2003

Appl. No.:

10/658722

Inventors:

Rahul Gupta - Santa Clara CA, US
Andrew Ingle - Fremont CA, US
Sriram Natarajan - Burlingame CA, US
Stefan Grebler - Sunnyvale CA, US

Assignee:

Osram Opto Semiconductors GmbH - Regensburg

International Classification:

H05B 33/14
H05B 33/00
H05B 33/10
H01L 51/50
H01L 51/56

US Classification:

313504, 313503, 313506, 313509, 445 24, 427 66

Abstract:

The shapes of the photo-resist layer “banks” which define pockets for inkjet printing or other patterned processes are optimized to provide a more uniform drying profile for substances which are to be deposited in those pockets and dried therein. Preferably, the shapes of the banks are “mushroom” shaped such that a portion of the photo-resist layer overhangs the exposed lower electrode layer.

US Patent:

7562389, Jul 14, 2009

Filed:

Jul 30, 2004

Appl. No.:

10/903391

Inventors:

Rajan Goyal - Sunnyvale CA, US
Virgil N. Mihailovici - San Jose CA, US
Rahul Gupta - Sunnyvale CA, US
Pere Monclus - San Jose CA, US
Ahsan Habib - Los Gatos CA, US
Kirtikumar L. Prabhu - San Jose CA, US
Christophe J. Paggen - Plainevaux, BE
Shyamasundar S. Kaluve - Bangalore, IN

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

G06F 11/00
H04L 9/00

US Classification:

726 22, 726 11, 726 12, 713153, 713154

Abstract:

In accordance with one embodiment of the present invention, a method includes receiving a packet at a physical interface of a network security gateway. The packet is tagged with a first VLAN identifier associated with an external network. The method also includes communicating a copy of the packet to a first processor, analyzing the copy of the packet at the first processor to determine whether the packet violates a security condition, and communicating a reply message from the first processor to the interface. The reply message indicates whether the packet violates a security condition. If the packet does not violate a security condition, the method includes re-tagging the packet with a second VLAN identifier associated with a protected network by using a second processor at the physical interface. The method further includes communicating the re-tagged packet to the protected network if the packet does not violate a security condition.

US Patent:

7629061, Dec 8, 2009

Filed:

Mar 30, 2004

Appl. No.:

10/812568

Inventors:

Rahul Gupta - Milpitas CA, US
Andrew Ingle - Fremont CA, US

Assignee:

Osram Opto Semiconductors GmbH - Regensburg

International Classification:

H01L 51/54

US Classification:

428690, 428917, 313504, 313506

Abstract:

What is disclosed is an organic electronic device which has at least one hetero-structure of film layers. The layers can be cross-linked and stacked one upon another to add a plurality of different functions and optimizations to the device, particularly in organic light emitting diodes.

US Patent:

20050067949, Mar 31, 2005

Filed:

Sep 30, 2003

Appl. No.:

10/676434

Inventors:

Sriram Natarajan - Burlingame CA, US
Andrew Ingle - Fremont CA, US
Rahul Gupta - Santa Clara CA, US

International Classification:

H05B033/14
H05B033/10

US Classification:

313504000, 313503000, 313506000, 427066000, 445024000

Abstract:

An organic polymer solution is made of at least one organic polymer, a first solvent, and a second solvent. The first solvent has a high solubility (e.g., the first solvent dissolves at least about one weight percent of the organic polymers) and has a faster evaporation rate than the second solvent, and the second solvent has a very low solubility (e.g., the second solvent dissolves less than about one-fourth weight percent of the organic polymers). After the solution is deposited on an object, the solution is allowed to dry. As the solution dries, the first solvent due to its faster evaporation rate than the second solvent starts to evaporate from the solution, and soon after the first solvent starts to evaporate, the one or more organic polymers, due to its lower solubility in the second solvent, rapidly gels resulting in a substantially uniform organic polymer layer.

US Patent:

20050069713, Mar 31, 2005

Filed:

Sep 30, 2003

Appl. No.:

10/674864

Inventors:

Rahul Gupta - Santa Clara CA, US
Joseph Carr - Los Gatos CA, US

International Classification:

B05D005/06

US Classification:

428411100, 427402000, 427430100, 427066000

Abstract:

Material is deposited on a substrate layer by forming a multilayered structure and dipping the multilayered structure into a solution containing the material for a sufficient length of time to allow the solution to spread through capillary action to a predetermined region. The multilayered structure is formed by coating the substrate layer with a spacer/pattern layer that defines the predetermined region and pressing a cover layer against the space/pattern layer.

US Patent:

20050069727, Mar 31, 2005

Filed:

Sep 30, 2003

Appl. No.:

10/676697

Inventors:

Rahul Gupta - Santa Clara CA, US
Florian Pschenitzka - San Jose CA, US
Franky So - San Jose CA, US
Pierre-Marc Allemand - San Jose CA, US
Vi-En Choong - San Jose CA, US

International Classification:

H05B033/14
C09K011/06

US Classification:

428690000, 428917000, 313504000, 313506000, 257088000, 257040000, 252301350

Abstract:

The position of the recombination zone can be controlled by controlling the mobility of the charge carriers. In an embodiment of the invention, the mobility of the charge carriers within the emissive polymer layer is controlled by the addition of traps—either electron traps, hole traps, or electron/hole traps. The electron traps reduce electron mobility, the hole traps reduce hole mobility, and the electron/hole traps reduce both electron mobility and hole mobility. The electron mobility and/or the hole mobility can be altered using the traps so that the recombination zone is positioned in the emissive polymer layer sufficiently far from the cathode so that quenching is minimized, and sufficiently far from the HTL/emissive polymer layer interface so that lifetime and/or efficiency is improved.