Venkat S Venkataramani

US Patent:

6335078, Jan 1, 2002

Filed:

Nov 27, 1998

Appl. No.:

09/200803

Inventors:

Venkat Subramaniam Venkataramani - Clifton Park NY
James Anthony Brewer - Scotia NY
Marcus Preston Borom - Niskayuna NY
Wayne Charles Hasz - Pownal VT
Lawrence Edward Szala - Scotia NY

Assignee:

General Electric Company - Schenectady NY

International Classification:

B32B 324

US Classification:

428139, 428137, 428131, 428132, 428133, 428596

Abstract:

A curable masking material for protecting a passage hole in a metal-based substrate is formed of an extrudable resin composition. The resin composition is thermally stable at elevated temperatures, and does not serve as an adhesion site for any coatings which are applied over the masking material. In addition, the resin composition has non-Newtonian flow characteristics and is adapted to form a protrusion extending from the passage hole upon extrusion to fill the passage hole.

US Patent:

6361735, Mar 26, 2002

Filed:

Sep 1, 1999

Appl. No.:

09/388091

Inventors:

Venkat Subramaniam Venkataramani - Clifton Park NY
Charles David Greskovich - Schenectady NY
Steven Jude Duclos - Clifton Park NY
James Anthony Brewer - Glenville NY

Assignee:

General Electric Company - Schenectady NY

International Classification:

C04B 3564

US Classification:

264643, 264642, 264645, 264656, 264614, 156 8911, 156 8923

Abstract:

The invention relates to a method of forming a composite article comprising the steps of forming a plurality of green ceramic elements, wherein the green ceramic elements are arranged side by side, and the green ceramic elements are spaced from each other by gaps; filling the gaps with a second material; and sintering the green ceramic elements with the second material to form the composite article. The second material, after being sintered, acts as a reflector layer to prevent substantially all light in one of the sintered ceramic elements from reaching an adjacent sintered ceramic element. The step of filling the gaps may be carried out by forming a slurry containing the second material in powder form and immersing the green ceramic elements in the slurry. The process of cosintering the green ceramic elements with the reflector composition provides improved dimensional control during sintering and reduces processing costs.

US Patent:

6519313, Feb 11, 2003

Filed:

May 30, 2001

Appl. No.:

09/681736

Inventors:

Venkat Subramaniam Venkataramani - Clifton Park NY
Steven Jude Duclos - Clifton Park NY

Assignee:

General Electric Company - Niskayuna NY

International Classification:

H05G 164

US Classification:

378 19, 378 988, 250367, 25037011

Abstract:

A scintillator pack comprises an array of scintillator pixels and an x-ray absorbing layer disposed in inter-scintillator regions between the scintillator pixels. The x-ray absorbing layer acts to absorb x-rays and protect underlying regions of the inter-scintillator regions. The x-ray absorbing layer may be formed by a number of methods including casting and melt infiltration.

US Patent:

6583563, Jun 24, 2003

Filed:

Feb 16, 1999

Appl. No.:

09/250634

Inventors:

Venkat Subramaniam Venkataramani - Clifton Park NY
Charles David Greskovich - Schenectady NY
Curtis Edward Scott - Mentor OH
James Anthony Brewer - Glenville NY
Changlong Ning - Leicester, GB

Assignee:

General Electric Company - Niskayuna NY

International Classification:

H01J 1716

US Classification:

313634, 313623, 313625, 313626, 313636

Abstract:

A ceramic discharge chamber for a lamp, according to an exemplary embodiment of the invention, comprises a first member which includes a leg portion and a transition portion, wherein the leg portion and the transition portion are integrally formed as one piece from a ceramic material, and a second member which includes a body portion, wherein the body portion is bonded to the transition portion of the first member. The ceramic discharge chamber can be formed by injection molding a ceramic material to form the first member, the first member forming a first portion of the ceramic discharge chamber; and bonding the first member to a second member which forms a second portion of the ceramic discharge chamber. The members which form the ceramic discharge chamber can greatly facilitate assembly of the discharge chamber, because the discharge chamber can be constructed with only one or two bonds between the members. The reduction in the number of bonds has the advantages of expediting assembly of the discharge chamber, reducing the number of potential bond defects during manufacturing, and reducing the possibility of breakage of the discharge chamber at a bond region during handling.

US Patent:

6585913, Jul 1, 2003

Filed:

Jul 30, 2001

Appl. No.:

09/918431

Inventors:

Robert Joseph Lyons - Burnt Hills NY
Sergio Martins Loureiro - Albany NY
James Scott Vartuli - Rexford NY
Venkat Subraman Venkataramani - Clifton Park NY

Assignee:

General Electric Company - Niskayuna NY

International Classification:

C09K 1168

US Classification:

2523015, 2523014 R, 25230117, 423263

Abstract:

Scintillator compositions useful for the detection of high-energy radiation, such as X, , or radiation, contain alkali and rare earth pyrotungstates. In particular, the pyrotungstate is a double tungstate containing an oxide of an alkali metal selected from the group consisting of Na, K, Rb, and Cs and an oxide of a rare-earth element selected from the group consisting of Y, Gd, La, and Lu. The scintillators are characterized by high light output, reduced afterglow, short decay time, and high X-ray stopping power.

US Patent:

6620763, Sep 16, 2003

Filed:

May 10, 2001

Appl. No.:

09/852040

Inventors:

Venkat S. Venkataramani - Clifton Park NY
Raul E. Ayala - Clifton Park NY

Assignee:

The United States of America as represented by the United States Department of Energy - Washington DC

International Classification:

B01J 2000

US Classification:

502400, 502439, 502500, 502504, 502514, 502517

Abstract:

This process produces a sorbent for use in desulfurization of coal gas. A zinc titanate compound and a metal oxide are mixed by milling the compounds in an aqueous medium, the resulting mixture is dried and then calcined, crushed, sleved and formed into pellets for use in a moving-bed reactor. Metal oxides suitable for use as an additive in this process include: magnesium oxide, magnesium oxide plus molybdenum oxide, calcium oxide, yttrium oxide, hafnium oxide, zirconium oxide, cupric oxide, and tin oxide. The resulting sorbent has a percentage of the original zinc or titanium ions substituted for the oxide metal of the chosen additive.

US Patent:

6706212, Mar 16, 2004

Filed:

Apr 12, 2002

Appl. No.:

10/121363

Inventors:

Venkat Subramaniam Venkataramani - Clifton Park NY
Sergio Martins Loureiro - Albany NY
Manisha Vishwanath Rane - Schenectady NY

Assignee:

General Electric Company - Niskayuna NY

International Classification:

C09K 1155

US Classification:

2523014F, 2503634, 25036303

Abstract:

Cerium-doped alkaline-earth hafnium oxide scintillator compositions have at least one alkaline earth metal selected from the group consisting of Ba, Sr, Ca, and combinations thereof. The scintillator compositions can be formed into a shape having porosity less than about 0. 05 percent for improved transparency. The alkaline earth metal can be partially substituted with divalent and/or trivalent ions other than cerium. Hafnium can be partially substituted with divalent, trivalent, and/or tetravalent ions. The scintillators are characterized by high light output, short decay time, and high radiation stopping power. The scintillators can be used as detector elements in PET systems.

US Patent:

6791266, Sep 14, 2004

Filed:

Apr 7, 2003

Appl. No.:

10/408609

Inventors:

Venkat Subramaniam Venkataramani - Clifton Park NY
Charles David Greskovich - Schenectady NY
Curtis Edward Scott - Mentor OH
James Anthony Brewer - Glenville NY

Assignee:

General Electric Company - Schenectady NY

International Classification:

H01J 1718

US Classification:

313623, 313624, 313625

Abstract:

A ceramic discharge chamber for a lamp, according to an exemplary embodiment of the invention, comprises a first member which includes a leg portion and a transition portion, wherein the leg portion and the transition portion are integrally formed as one piece from a ceramic material, and a second member which includes a body portion, wherein the body portion is bonded to the transition portion of the first member. The ceramic discharge chamber can be formed by injection molding a ceramic material to form the first member, the first member forming a first portion of the ceramic discharge chamber; and bonding the first member to a second member which forms a second portion of the ceramic discharge chamber. The members which form the ceramic discharge chamber can greatly facilitate assembly of the discharge chamber, because the discharge chamber can be constructed with only one or two bonds between the members. The reduction in the number of bonds has the advantages of expediting assembly of the discharge chamber, reducing the number of potential bond defects during manufacturing, and reducing the possibility of breakage of the discharge chamber at a bond region during handling.