Rajan Poirier Dominique Tandon

US Patent:

6516634, Feb 11, 2003

Filed:

Feb 11, 2000

Appl. No.:

09/502284

Inventors:

David J. Green - State College PA
Vincenzo M. Sglavo - Roncegno, IT
Rajan Tandon - Fremont CA

Assignee:

The Penn State Research Foundation - University Park PA

International Classification:

C03C 1500

US Classification:

65 3014, 65 3013, 65 28, 65114

Abstract:

Embodiments include a method for forming a glass which displays visible cracking prior to failure when subjected to predetermined stress level that is greater than a predetermined minimum stress level and less than a failure stress level. The method includes determining a critical flaw size in the glass and introducing a residual stress profile to the glass so that a plurality of visible cracks are formed prior to failure when the glass is subjected to a stress that is greater than the minimum stress level and lower than the critical stress. One method for forming the residual stress profile includes performing a first ion exchange so that a first plurality of ions of a first element in the glass are exchanged with a second plurality of ions of a second element that have a larger volume than the first ions. A second ion exchange is also performed so that a plurality of the second ions in the glass are exchanged back to ions of the first element.

US Patent:

H18619, Sep 5, 2000

Filed:

Oct 21, 1998

Appl. No.:

9/176421

Inventors:

Darin J. Aldrich - Thornton CO
Rajan Tandon - Peoria IL

Assignee:

Caterpillar Inc. - Peoria IL

International Classification:

C04B 3500
B05D 722

US Classification:

501 974

Abstract:

The present invention relates to a ceramic alloy composite composition having the alloy spontaneously infiltrated into the ceramic, with the preferred ceramic alloy composite composition being a Si. sub. 3 N. sub. 4 /TiN/Cu-Ti composite composition and a method for forming the ceramic alloy composite composition.

US Patent:

61739138, Jan 16, 2001

Filed:

Aug 25, 1999

Appl. No.:

9/383287

Inventors:

Scott F. Shafer - Morton IL
Rajan Tandon - Peoria IL
Jayant B. Gondalia - Richmond VA

Assignee:

Caterpillar Inc. - Peoria IL

International Classification:

F02M 5900
F02M 6100
F02M 6300

US Classification:

2395332

Abstract:

A fuel injector nozzle assembly comprises a nozzle defining a guide bore, a fuel pressurization chamber, a seat, and a nozzle orifice. A check valve member has an impact area and a guide portion. The guide portion slides within the guide bore to allow the check valve member to slide between an open position and a closed position. In the open position the fuel pressurization chamber is in fluid communication with the nozzle orifice. In the closed position the impact area of the check valve member is pressing against the seat of the nozzle, and the check valve member is blocking fluid communication between the fuel pressurization chamber and the nozzle orifice. The check valve member comprises a ceramic material having a coefficient of thermal expansion. alpha. >8. times. 10. sup. -6 /. degree. C. when averaged over a temperature range of 0. degree. C. to 300. degree. C.

Author:

Rajan Tandon

ISBN #:

0470080523