Choong P Kim

6709536, Mar 23, 2004

Apr 2, 2002

09/890480

Choong Paul Kim - Northridge CA
Charles C. Hays - Pasadena CA
William L. Johnson - Pasadena CA

California Institute of Technology - Pasadena CA

C22C 4500

148561, 148403, 420423

A composite metal object comprises ductile crystalline metal particles in an amorphous metal matrix. An alloy is heated above its liquidus temperature. Upon cooling from the high temperature melt, the alloy chemically partitions, forming dendrites in the melt. Upon cooling the remaining liquid below the glass transition temperature it freezes to the amorphous state, producing a two-phase microstructure containing crystalline particles in an amorphous metal matrix. The ductile metal particles have a size in the range of from 0. 1 to 15 micrometers and spacing in the range of from 0. 1 to 20 micrometers. Preferably, the particle size is in the range of from 0. 5 to 8 micrometers and spacing is in the range of from 1 to 10 micrometers. The volume proportion of particles is in the range of from 5 to 50% and preferably 15 to 35%. Differential cooling can produce oriented dendrites of ductile metal phase in an amorphous matrix.

7244321, Jul 17, 2007

Dec 12, 2003

10/735148

Choong Paul Kim - Northridge CA, US
Charles C. Hays - Pasadena CA, US
William L. Johnson - Pasadena CA, US

California Institute of Technology - Pasadena CA

C22C 45/00

148561, 148421

A composite metal object comprises ductile crystalline metal particles in an amorphous metal matrix. An alloy is heated above its liquidus temperature. Upon cooling from the high temperature melt, the alloy chemically partitions, forming dendrites in the melt. Upon cooling the remaining liquid below the glass transition temperature it freezes to the amorphous state, producing a two-phase microstructure containing crystalline particles in an amorphous metal matrix. The ductile metal particles have a size in the range of from 0. 1 to 15 micrometers and spacing in the range of from 0. 1 to 20 micrometers. Preferably, the particle size is in the range of from 0. 5 to 8 micrometers and spacing is in the range of from 1 to 10 micrometers. The volume proportion of particles is in the range of from 5 to 50% and preferably 15 to 35%. Differential cooling can produce oriented dendrites of ductile metal phase in an amorphous matrix.

8613813, Dec 24, 2013

Mar 23, 2009

12/409253

William L. Johnson - Pasadena CA, US
Marios D. Demetriou - Los Angeles CA, US
Choong Paul Kim - Glendale CA, US
Joseph P. Schramm - Pasadena CA, US

California Institute of Technology - Pasadena CA

C22F 1/10
B23K 15/00

148561, 21912111, 219773, 723421

An apparatus and method of uniformly heating, rheologically softening, and thermoplastically forming metallic glasses rapidly into a net shape using a rapid capacitor discharge forming (RCDF) tool are provided. The RCDF method utilizes the discharge of electrical energy stored in a capacitor to uniformly and rapidly heat a sample or charge of metallic glass alloy to a predetermined “process temperature” between the glass transition temperature of the amorphous material and the equilibrium melting point of the alloy in a time scale of several milliseconds or less. Once the sample is uniformly heated such that the entire sample block has a sufficiently low process viscosity it may be shaped into high quality amorphous bulk articles via any number of techniques including, for example, injection molding, dynamic forging, stamp forging, and blow molding in a time frame of less than 1 second.

20060137272, Jun 29, 2006

Dec 23, 2005

11/318160

Choong Kim - Rancho Palos Verdes CA, US

E04B 5/00

052411000

A waterproof sheet structure for a cool roof includes a waterproof sheet layer and a top reinforce layer placed on one side of the waterproof layer. The top reinforce layer is impregnated in a liquid polymer and then dried, and is treated to have a light color. The liquid polymer has fire retardant property. The top reinforce layer is made of a fiberglass cloth, which includes a plurality of glass fibers woven with one another. The polymer fill gaps between the woven fibers. The polymer is impregnated onto the fiberglass cloth in such a thickness so that there are no glass fibers exposed out of the polymer. The waterproof sheet is made by forming the fiberglass cloth, and then coating asphalt on the fiberglass cloth with a constant thickness.

20060174546, Aug 10, 2006

Sep 7, 2005

11/220477

Choong Kim - Rancho Palos Verdes CA, US

E04H 15/18

052063000

A joint sealing structure for waterproof sheets for a cool roof includes a first waterproof sheet and a second waterproof sheet installed in such a manner that their edges are spaced apart from each other with a predetermined gap in-between and a polymer-filled portion that fills the gap. The polymer-filled portion is formed by filling the gap with a liquid polymer that has fire-retardant property. The waterproof sheet includes a waterproof sheet layer and a top reinforce layer placed on one side of the waterproof layer. The top reinforce layer is impregnated in the liquid polymer and then dried, and is treated to have a light color. The top reinforce layer is a fiberglass cloth having a plurality of glass fibers woven with one another. The polymer is impregnated onto the fiberglass cloth in such a thickness so that there are no glass fibers exposed out of the polymer.

20140033787, Feb 6, 2014

Oct 3, 2013

14/045667

Marios D. Demetriou - West Hollywood CA, US
Choong Paul Kim - Glendale CA, US
Joseph P. Schramm - Sierra Madre CA, US

California Institute of Technology - Pasadena CA

C21D 1/40
H05B 3/00
B21J 9/08

7234296, 219113

An apparatus and method of uniformly heating, rheologically softening, and thermoplastically farming metallic glasses rapidly into a net shape using a rapid capacitor discharge forming (RCDF) tool are provided. The RCDF method utilizes the discharge of electrical energy stored in a capacitor to uniformly and rapidly heat a sample or charge of metallic glass alloy to a predetermined “process temperature” between the glass transition temperature of the amorphous material and the equilibrium melting point of the alloy in a time scale of several milliseconds or less. Once the sample is uniformly heated such that the entire sample block has a sufficiently low process viscosity it may be shaped into high quality amorphous bulk articles via any number of techniques including, for example, injection molding, dynamic forging, stamp forging, and blow molding in a time frame of less than 1 second.

20160298205, Oct 13, 2016

Apr 8, 2016

15/094740

- Pasadena CA, US
Marios D. Demetriou - West Hollywood CA, US
Choong Paul Kim - Glendale CA, US
Joseph P. Schramm - Sierra Madre CA, US

C21D 7/13
C22F 1/14
C21D 1/38
C22C 45/00
C22C 45/02
C22F 1/18
C22C 45/10

An apparatus and method of uniformly heating, rheologically softening, and thermoplastically forming metallic glasses rapidly into a net shape using a rapid capacitor discharge forming (RCDF) tool are provided. The RCDF method utilizes the discharge of electrical energy stored in a capacitor to uniformly and rapidly heat a sample or charge of metallic glass alloy to a predetermined “process temperature” between the glass transition temperature of the amorphous material and the equilibrium melting point of the alloy in a time scale of several milliseconds or less. Once the sample is uniformly heated such that the entire sample block has a sufficiently low process viscosity it may be shaped into high quality amorphous bulk articles via any number of techniques including, for example, injection molding, dynamic forging, stamp forging, and blow molding in a time frame of Less than 1 second.