Ki Yong Kim

US Patent:

52647110, Nov 23, 1993

Filed:

Sep 15, 1992

Appl. No.:

7/945040

Inventors:

Mitra Dutta - Matawan NJ
Harold L. Grubin - West Hartford CT
Gerald J. Iafrate - Raleigh NC
Ki Wook Kim - Durham NC
Michael A. Stroscio - Durham NC

Assignee:

The United States of America as represented by the Secretary of the Army - Washington DC

International Classification:

H01L 2902

US Classification:

257 14

Abstract:

A polar semiconductor quantum wire for use in electronic and opto-electronic devices. The polar semiconductor quantum wire is either completely or partially encapsulated in metal to reduce the strength of the scattering potential associated with interface optical phonons normally established at the lateral boundaries of polar semiconductor quantum wires. Metal alone or metal employed in conjunction with modulation doping enhances the transport of charge carriers within the polar semiconductor quantum wire.

US Patent:

56617402, Aug 26, 1997

Filed:

Apr 16, 1996

Appl. No.:

8/636995

Inventors:

Mitra Dutta - Tinton Falls NJ
Michael A. Stroscio - Durham NC
Yuri M. Sirenko - Raleigh NC
Ki Wook Kim - Durham NC

Assignee:

The United States of America as represented by the Secretary of the Army - Washington DC

International Classification:

H01S 319
H01L 2906

US Classification:

372 45

Abstract:

A semiconductor lasing device is formed by disposing a quantum well or quum wire array between positive and negative ohmic contacts such that different potentials are applied along the array to establish a transverse electromagnetic (TEM) mode of the optic signal (i. e. where the field components lie in a plane perpendicular to the direction of propagation). Thus, the light confinement l will be on the order of the electron confinement a. By applying different potentials via the positive and negative ohmic contacts to multiply connected waveguides, the established TEM mode does not have a cut-off frequency, and therefore, the gain of device can be greatly enhanced while still providing increased anisotropy and a low threshold current.

US Patent:

40395120, Aug 2, 1977

Filed:

Sep 15, 1975

Appl. No.:

5/613145

Inventors:

Ki Soo Kim - Irvington NY
Siegfried Altscher - Monsey NY

Assignee:

Stauffer Chemical Company - Westport CT

International Classification:

C08G 3310
C08G 3318

US Classification:

260 61

Abstract:

Flame retardant polymers of benzene phosphorus oxydichloride, 4,4'-thiodiphenol and POCl. sub. 3 are disclosed which are preferably formed by reacting these monomers in an inert organic solvent at ambient temperature in the presence of an amine acid acceptor.

US Patent:

53748310, Dec 20, 1994

Filed:

Apr 14, 1993

Appl. No.:

8/051105

Inventors:

Mitra Dutta - Matawan NJ
Gerald J. Iafrate - Raleigh NC
Ki W. Kim - Durham NC
Michael A. Stroscio - Durham NC

Assignee:

The United States of America as represented by the Secretary of the Army - Washington DC

International Classification:

H01L 29225

US Classification:

257 23

Abstract:

A phonon modulator which includes a semiconductor body having at least first and second polar semiconductor quantum wells formed therein separated by a polar semiconductor barrier. The conduction band energies of the wells and barrier are selected such that the lowest energy electronic states in the two wells are separated by an energy which is greater than the energies of optical phonons in the well and barrier materials. Respective voltages are applied to the wells which are less than the optical phonon emission threshold in the well and barrier materials to generate respective currents therein. Increasing the voltage to the first well to a level in excess of such optical phonon emission threshold causes optical phonons to be emitted from the first well to create a standing interface mode from the first well through the barrier to the second well, thereby providing a scattering mechanism for electrons in the second well and reducing the current thereof.

US Patent:

40425428, Aug 16, 1977

Filed:

Sep 15, 1975

Appl. No.:

5/613143

Inventors:

Ki Soo Kim - Irvington NY

Assignee:

Stauffer Chemical Company - Westport CT

International Classification:

C08L 8900

US Classification:

260 6

Abstract:

The recovery of a polymer product formed by condensing an organo-phosphonic acid dichloride or dibromide, a dihydroxy aromatic compound and, optionally, a crosslinking momomer in an organic solvent reaction medium, as a granular solid is accomplished by combining said organic solvent containing the polymer product and an aqueous solution which contains an effective amount of suspending agent to later induce precipitation of said polymer product and by thereafter agitating the solution while removing the solvent therefrom to affect precipitation of said granular polymer product.