Krishan L Luthra, 75780 Red Oak Dr, Schenectady, NY 12309

6347446, Feb 19, 2002

Jun 3, 1999

09/324550

Krishan Lal Luthra - Niskayuna NY
Hongyu Wang - Niskayuna NY

General Electric Company - Schenectady NY

B23P 600

2940218, 298891, 29530

A Silicon carbide-silicon matrix composite having improved oxidation resistance at high temperatures in dry or water-containing environments is provided. A method is given for sealing matrix cracks in situ in melt infiltrated silicon carbide-silicon matrix composites. The composite cracks are sealed by the addition of various additives, such as boron compounds, into the melt infiltrated silicon carbide-silicon matrix.

6365233, Apr 2, 2002

Jun 10, 1999

09/329378

Gregory Scot Corman - Ballston Lake NY
Krishan Lal Luthra - Schenectady NY

General Electric Company - Schenectady NY

B05D 118

4274301, 4274432

A fiber-reinforced silicon-silicon carbide matrix composite having improved oxidation resistance at high temperatures in dry or water-containing environments is produced. The invention also provides a method for protecting the reinforcing fibers in the silicon-silicon carbide matrix composites by coating the fibers with a silicon-doped boron nitride coating.

6387456, May 14, 2002

Sep 5, 2000

09/655123

William Patrick Allen - Portland CT
Nathan S. Jacobson - Westlake OH
Narottam P. Bansal - North Olmsted OH
Elizabeth J. Opila - Lakewood OH
James L. Smialek - Strongsville OH
Kang N. Lee - Westlake OH
Irene T. Spitsberg - Loveland OH
Hongyu Wang - Niskayuna NY
Peter Joel Meschter - Niskayuna NY
Krishan Lal Luthra - Schenectady NY

General Electric Company - NY
United Technologies Corporation - DE
The United States of America as represented by the Administrator of the National Aeronautics and Space Administration - Washington DC

C23C 406

427452, 427450, 427453

A barrier layer for a silicon containing substrate which inhibits the formation of gaseous species of silicon when exposed to a high temperature aqueous environment comprises a barium-strontium alumino silicate.

6410148, Jun 25, 2002

Apr 15, 1999

09/292349

William Patrick Allen - Portland CT
Nathan S. Jacobson - Westlake OH
Elizabeth J. Opila - Lakewood OH
James L. Smialek - Strongsville OH
Kang N. Lee - Westlake OH
Irene T. Spitsberg - Loveland OH
Hongyu Wang - Niskayuna NY
Peter Joel Meschter - Niskayuna NY
Krishan Lal Luthra - Schenectady NY

General Electric Co. - New York
United Technologies Corp. - DE
The United States of America as represented by the Administrator of the National Aeronautics and Space Administration - Washington DC

B32B 900

428446, 428448, 428472, 4284722, 428701, 428702

A barrier layer for a silicon containing substrate which inhibits the formation of gaseous species of silicon when exposed to a high temperature aqueous environment comprises a barium-strontium alumino silicate.

6517341, Feb 11, 2003

Feb 26, 1999

09/259364

Milivoj Konstantin Brun - Ballston Lake NY
Krishan Lal Luthra - Niskayuna NY

General Electric Company - Niskayuna NY

F23J 700

431 2, 431 4, 42725518, 427237, 44320, 264 30, 110343

While silicon-containing ceramics or ceramic composites are prone to material loss in combustion gas environments, this invention introduces a method to prevent or greatly reduce the thickness loss by injecting directly an effective amount, generally in the part per million level, of silicon or silicon-containing compounds into the combustion gases.

6630200, Oct 7, 2003

May 1, 2001

09/846548

Hongyu Wang - Niskayuna NY
Krishan Lal Luthra - Schenectady NY

General Electric Company - Niskayuna NY

C23C 1416

42725526, 42724915, 4272557, 427452

A method of forming an article. The method comprises forming a silicon-based substrate that is oxidizable by reaction with an oxidant to form at least one gaseous product and applying an intermediate layer/coating onto the substrate, wherein the intermediate layer/coating is oxidizable to a nongaseous product by reaction with the oxidant in preference to reaction of the silicon-containing substrate with the oxidant.

6820334, Nov 23, 2004

Apr 19, 2002

10/063404

Anteneh Kebbede - Albany NY
Milivoj Konstantin Brun - Ballston Lake NY
Krishan Lal Luthra - Niskayuna NY
Henry Charles McGuigan - Duanesburg NY

General Electric Company - Niskayuna NY

B23P 1500

298891

A method for repairing an article made of a fiber-reinforced ceramic matrix composite comprises attaching sections of a fiber-reinforced tape to the damaged area and then infiltrating the sections with the ceramic matrix or ceramic matrix precursor material. The material around the damaged area may be removed first to form a depression that is then filled with sections of the fiber-reinforced tape and further infiltrated with the ceramic matrix or ceramic matrix precursor material. The repaired article shows stress-strain curve similar to a defect-free article.

6844075, Jan 18, 2005

Oct 6, 2003

10/678813

Jennifer Su Saak - Clifton Park NY, US
Peter Joel Meschter - Niskayuna NY, US
David Joseph Mitchell - Niskayuna NY, US
Krishan Lal Luthra - Schenectady NY, US

General Electric Company - Niskayuna NY

B32B 904
F03B 312
C23C 1606

428446, 428448, 428697, 428699, 428701, 428702, 42725519, 427427, 416241 B

A coating for a silicon based material such as those used in high temperature environments. An aspect of the invention is directed to an environmental barrier coating including a silicon bond coat, and intermediate coat, and a top coat. The intermediate coat may comprise tantalum aluminate, niobium aluminate, or a mixture of the two. The intermediate coat is resistant to solid-state suburface reactions with the bond coat and the top coat and is substantially inert to reactions with silica at high temperatures.