Youngmin H Choi

US Patent:

7038293, May 2, 2006

Filed:

Mar 29, 2004

Appl. No.:

10/811512

Inventors:

Youngmin A. Choi - Agoura Hills CA, US
Christine Geosling - Calabasas CA, US
Henry Abbink - Westlake Village CA, US

Assignee:

Northrop Grumman Corp. - Los Angeles CA

International Classification:

H01L 29/00

US Classification:

257510, 257751

Abstract:

An apparatus in one example comprises a wafer portion that comprises a conduction layer. Upon exposure of the conduction layer during a etch of the wafer portion, the conduction layer serves to dissipate a portion of a charge buildup on the wafer portion during an etch of the wafer portion.

US Patent:

7222532, May 29, 2007

Filed:

Oct 6, 2005

Appl. No.:

11/244966

Inventors:

Youngmin A. Choi - Agoura Hills CA, US

Assignee:

Northrop Grumman Corporation - Los Angeles CA

International Classification:

G01P 9/04
G01C 19/00

US Classification:

73493, 7350413, 73431

Abstract:

A packaging system in one example comprises an improved mechanical packaging system for a circuit board disposed between housing elements, the improvement comprising an upper housing member having a centrally disposed opening provided therethrough, a unitary electromagnetic shield disposed on at least an upper surface of the circuit board and secured to the circuit board, the unitary electromagnetic shield secured to the upper housing member, such that undesired mechanical vibration modes are substantially reduced.

US Patent:

7255487, Aug 14, 2007

Filed:

Oct 24, 2006

Appl. No.:

11/585032

Inventors:

Youngmin A. Choi - Agoura Hills CA, US

International Classification:

G02B 6/38

US Classification:

385 73, 385 72

Abstract:

A novel Fabry-Perot resonance cavity has been recognized with ruggedized packaging. This cavity is formed by simple planar and concave (or two concave) mirrors—attached at the fiber ends. The concave mirror is precisely aligned to the core of the fiber. The concave lens is fabricated on the end of the fiber by making an indentation of correct geometry and smoothness. The concave mirror has multiple dielectric layers applied on the concave lens to achieve the final, desired optical characteristics. This structure is packaged using novel techniques from which it derives great utility. The resulting packaged assembly is environmentally robust and capable of operating at very high frequencies with low input voltages.

US Patent:

7607350, Oct 27, 2009

Filed:

Oct 6, 2005

Appl. No.:

11/244464

Inventors:

Youngmin A. Choi - Agoura Hills CA, US

Assignee:

Northrop Grumman Guidance and Electronics Company, Inc. - Woodland Hills CA

International Classification:

G01P 9/04
G01C 19/56
G01P 1/02

US Classification:

7350413, 73493

Abstract:

A circuit board mounting system in one example comprises an improved mounting system for a circuit board disposed between housing elements, wherein the improvement comprises a plurality of slots formed in the circuit board and a plurality of bushings disposed within the slots, such that the housing elements rest on opposed ends of the bushings, and the circuit board moves in a plane substantially parallel to its mounting surfaces in response to changes in temperature, thus reducing thermal stress.

US Patent:

7839059, Nov 23, 2010

Filed:

Aug 3, 2007

Appl. No.:

11/890043

Inventors:

Youngmin A. Choi - Agoura Hills CA, US
David M. Rozelle - Woodland Hills CA, US

Assignee:

Northrop Grumman Guidance and Electronics Company, Inc. - Woodland Hills CA

International Classification:

H01L 41/09

US Classification:

310348

Abstract:

The Inner-Forcer milli-Hemispherical Resonator Gyro (mHRG) is a small, low cost, high performance gyroscope. It may have an extremely simplified design, with in one embodiment of the present method and apparatus only five major parts total, with most parts filling multiple functions. The method and apparatus in one embodiment may have: a resonator; and a body operatively coupled to the resonator, the unitary body integrally having electrodes, an electrode support unit, a weld ring and a plurality of electrically conductive pins, the plurality of electrodes operatively coupled to the electrically conductive pins.

US Patent:

20050238067, Oct 27, 2005

Filed:

Apr 26, 2004

Appl. No.:

10/831752

Inventors:

Youngmin Choi - Agoura Hills CA, US

International Classification:

H01S003/10

US Classification:

372020000, 372006000, 372099000

Abstract:

A novel Fabry-Perot resonance cavity has been recognized. This cavity is formed by simple planar and concave (or two concave) mirrors—attached at the fiber ends. The concave mirror is precisely aligned to the core of the fiber. The concave lens is fabricated on the end of the fiber by making an indentation of correct geometry and smoothness. The concave mirror has multiple dielectric layers applied on the concave lens to achieve the final, desired optical characteristics.

US Patent:

20080217797, Sep 11, 2008

Filed:

Feb 21, 2008

Appl. No.:

12/070705

Inventors:

Youngmin A. Choi - Agoura Hills CA, US

International Classification:

G02B 6/10

US Classification:

264 124

Abstract:

A novel A SIMPLE FIBER OPTIC MICRO CONCAVE MIRROR has been recognized. This mirror is formed by making a precision micro lens in a material deposited on the end of an optical fiber held in a suitable fiber ferrule. Multiple dielectric layers are applied on the lens to achieve the final, desired optical characteristic of the mirror. The concave mirror is precisely aligned to the core of the fiber. The concave lens is fabricated on the end of the fiber by making an indentation of correct geometry and smoothness.

US Patent:

20090060415, Mar 5, 2009

Filed:

Feb 21, 2008

Appl. No.:

12/070704

Inventors:

Youngmin A. Choi - Agoura Hills CA, US

International Classification:

G02B 6/12

US Classification:

385 14

Abstract:

A novel Fabry-Perot resonance cavity has been recognized. This cavity is formed by simple planar and concave mirrors that attached at the fiber ends. The concave mirror is precisely aligned to the core of the fiber. The concave lens is fabricated on the thin polymer film by making an indentation of correct geometry and smoothness. The concave mirror has multiple dielectric layers applied on the concave lens to achieve the final, desired optical characteristics.