Ramkumar Krishnan

US Patent:

6546394, Apr 8, 2003

Filed:

Dec 28, 1999

Appl. No.:

09/473073

Inventors:

Eugene I. Chong - Concord MA
Souripriya Das - Nashua NH
Charles G. Freiwald - Amherst NH
Aravind Yalamanchi - Nashua NH
Ramkumar Krishnan - Nashua NH
Jagannathan Srinivasan - Nashua NH

Assignee:

Oracle International Corporation - Redwood Shores CA

International Classification:

G06F 1730

US Classification:

707100

Abstract:

A database system having logical row identifiers (rowids) includes a secondary index which is traversed to locate a secondary index entry that includes a target secondary key value. Each secondary index entry also includes a logical rowid element. Each logical rowid element has both a primary key value element, and a datablock address element identifying a leaf block in an index-organized table that likely includes a row corresponding to the primary key value element. The leaf block is scanned to locate the row in the index-organized table that includes the target secondary key value and corresponds with the located, secondary index entry. A primary key scan is performed on the index-organized table if the row in the index-organized table is not located in the identified datablock.

US Patent:

6859808, Feb 22, 2005

Filed:

May 31, 2001

Appl. No.:

09/867678

Inventors:

Eugene I. Chong - Concord MA, US
Jagannathan Srinivasan - Nashua NH, US
Souripriya Das - Nashua NH, US
Charles G. Freiwald - Amherst NH, US
Aravind Yalamanchi - Nashua NH, US
Mahesh Jagannath - Burlington MA, US
Anh-Tuan Tran - Vacaville CA, US
Ramkumar Krishnan - Nashua NH, US

Assignee:

Oracle International Corporation - Redwood Shores CA

International Classification:

G06F017/30

US Classification:

707101, 707102, 707 3

Abstract:

A mapping mechanism for a primary B+tree in a database management system. The primary B+tree includes a plurality of rows. The mapping mechanism includes introducing a mapping table that includes a plurality of rows, including a row for each row of the primary B+tree, and that stores the logical identifier of the corresponding primary B+tree row. In addition, reverse mapping is provided by augmenting a primary B+tree to include in each primary B+tree row a physical row identifier of the corresponding mapping table row. An auxiliary structure created on a primary B+tree can make use of the proposed mapping mechanism. Specifically, the auxiliary structures refers to primary B+tree rows indirectly by storing the physical row identifier of the corresponding mapping table row.

US Patent:

7776386, Aug 17, 2010

Filed:

Jan 31, 2007

Appl. No.:

11/669712

Inventors:

Chowdary R. Koripella - Scottsdale AZ, US
Kurt W. Eisenbeiser - Tempe AZ, US
Ramkumar Krishnan - Gilbert AZ, US

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H01M 4/88
H01M 8/02
H01M 8/10

US Classification:

427115

Abstract:

A method is provided for fabricating an integrated micro fuel cell that derives power from a three-dimensional fuel/oxidant interchange having increased surface area and that is positioned on a second substrate that may be either porous or flexible with gas access holes, thereby avoiding precise alignment requirements of the openings providing fuel thereto. The method comprises forming on a first substrate, a plurality of pedestals including an anode and a cathode each comprising a porous metal; positioning an electrolyte between the anode and the cathode; and forming first metal contacts on the anode and cathode. The first substrate is removed and a second substrate is positioned against the fuel cell wherein the first metal contacts are selectively positioned to make electrical contact with second metal contacts on the second substrate.

US Patent:

8492052, Jul 23, 2013

Filed:

Oct 8, 2010

Appl. No.:

12/901410

Inventors:

Cody A Friesen - Fort McDowell AZ, US
Ramkumar Krishnan - Gilbert AZ, US
Grant Friesen - Fountain Hills AZ, US

Assignee:

Fluidic, Inc. - Scottsdale AZ

International Classification:

H01M 8/04

US Classification:

429512, 429498, 429499, 429503

Abstract:

An electrochemical cell includes a fuel electrode configured to operate as an anode to oxidize a fuel when connected to a load. An electrode holder includes a cavity for holding the fuel electrode, at least one inlet connected to the cavity on one side of the cavity and configured to supply an ionically conductive medium to the cavity, and at least one outlet connected to the cavity on an opposite side of the cavity and configured to allow the ionically conductive medium to flow out of the cavity. A plurality of spacers extend across the fuel electrode and the cavity in a spaced relation from each other to define a plurality of flow lanes in the cavity.

US Patent:

8632921, Jan 21, 2014

Filed:

Feb 2, 2011

Appl. No.:

13/019923

Inventors:

Cody A. Friesen - Fort McDowell AZ, US
Grant Friesen - Fountain Hills AZ, US
Ramkumar Krishnan - Gilbert AZ, US
Todd Trimble - Phoenix AZ, US

Assignee:

Fluidic, Inc. - Scottsdale AZ

International Classification:

H01M 8/22
H01M 8/06
H01M 8/08
H01M 8/04

US Classification:

429405, 429408, 429403, 429498, 429513, 429512

Abstract:

An electrochemical cell includes a first electrode configured to operate as an anode to oxidize a fuel when connected to a load. The first electrode includes a permeable electrode body configured to allow flow of an ionically conductive medium therethrough. An electrode holder includes a cavity for holding the first electrode. A diffuser is positioned in the cavity between the first electrode and the electrode holder with a gap formed between the diffuser and the electrode holder. The diffuser includes openings configured to allow flow of the ionically conductive medium therethrough and to distribute the flow through the first electrode. A second electrode is positioned in the cavity on a side of the first electrode that is opposite the diffuser, and is configured to operate as a cathode when connected to the load and in contact with the ionically conductive medium.

US Patent:

20060218132, Sep 28, 2006

Filed:

Mar 25, 2005

Appl. No.:

11/088858

Inventors:

Denis Mukhin - Marlborough MA, US
Boriana Milenova - Reading MA, US
Peter Stengard - St. Pete Beach FL, US
Ramkumar Krishnan - Nashua NH, US
Marcos Campos - Cambridge MA, US
Ari Mozes - Lexington MA, US

International Classification:

G06F 17/30

US Classification:

707004000

Abstract:

A system and computer program product provides data mining model deployment (scoring) functionality as a family of SQL functions (operators). A database management system comprises a processor operable to execute computer program instructions, a memory operable to store computer program instructions executable by the processor, and computer program instructions stored in the memory and executable to implement a plurality of database query language statements, each statement operable to cause a data mining function to be performed.

US Patent:

20080003485, Jan 3, 2008

Filed:

Jun 30, 2006

Appl. No.:

11/479737

Inventors:

Ramkumar Krishnan - Gilbert AZ, US
William J. Dauksher - Mesa AZ, US
Chowdary R. Koripella - Scottsdale AZ, US

International Classification:

H01M 4/86
H01M 8/10
B05D 5/12
H01M 4/88

US Classification:

429 44, 427115, 502101, 429 30

Abstract:

A method is provided for patterning a solid proton conducting electrolyte () for a micro fuel cell. The method comprises patterning a first side () of a solid proton conducting electrolyte () to increase the surface area, coating the patterned first side () with an electrocatalyst (), providing a first electrical conductor () to the first side (), and providing a second electrical conductor () to a second side () of the solid proton conducting electrolyte () opposed to the first side (). One exemplary embodiment comprises depositing a solid proton conducting electrolyte () over a substrate (), patterning the solid proton conducting electrolyte () to form a plurality of pedestals (), each pedestal () having an anode side adjacent a anode region () and a cathode side adjacent a cathode region (), coating the anode () and cathode () sides with an electrocatalyst (), providing a first electrical conductor () to the anode side (); and providing a second electrical conductor () to the cathode side ().

US Patent:

20080061027, Mar 13, 2008

Filed:

Sep 12, 2006

Appl. No.:

11/519553

Inventors:

Pawitter S. Mangat - Gilbert AZ, US
John J. D'Urso - Chandler AZ, US
Chowdary R. Koripella - Scottsdale AZ, US
Ramkumar Krishnan - Gilbert AZ, US

International Classification:

H01B 13/00
B05D 5/12
H01M 8/02

US Classification:

216 17, 427115, 429 38

Abstract:

A method is provided for fabricating a fuel cell that requires only front side alignment techniques to fabricate gas access holes. The method comprises etching the front side of a substrate () to provide a channel (), and forming a pedestal () on the front side of the substrate, wherein the pedestal () comprises an anode side () defining a fuel region () aligned with the channel (). An electrolyte () is positioned between the anode side () and a cathode side (), and the fuel region () is capped with an insulator (). A portion of the substrate () is removed from a back side to expose the channel ().