John S Muth

US Patent:

6423983, Jul 23, 2002

Filed:

Oct 13, 2000

Appl. No.:

09/687519

Inventors:

Jagdish Narayan - Raleigh NC
Ajay Kumar Sharma - Hillsboro OR
John F. Muth - Cary NC

Assignee:

North Carolina State University - Raleigh NC

International Classification:

H01L 3300

US Classification:

257 96, 257103

Abstract:

An electronic device has an alloy layer containing magnesium oxide and at least one of zinc oxide and cadmium oxide and having a cubic structure on a substrate. The alloy layer may be directly on the substrate or, alternatively, one or more buffer layers may be between the alloy layer and the substrate. The alloy layer may be domain-matched epitaxially grown directly on the substrate, or may be lattice-matched epitaxially grown directly on the buffer layer. The cubic layer may also be used to form single and multiple quantum wells. Accordingly, electronic devices having wider bandgap, increased binding energy of excitons, and/or reduced density of growth and/or misfit dislocations in the active layers as compared with conventional III-nitride electronic devices may be provided.

US Patent:

6450104, Sep 17, 2002

Filed:

Apr 28, 2000

Appl. No.:

09/560478

Inventors:

Edward Grant - Raleigh NC
John F. Muth - Cary NC
John Steven Cottle - Raleigh NC
Brian Ellery Dessent - Oakland CA
Jason Alan Cox - Raleigh NC

Assignee:

North Carolina State University - Raleigh NC

International Classification:

B61B 1300

US Classification:

1041382, 1041381, 738658, 74110, 105365

Abstract:

A robotic apparatus adapted for locomotion in an enclosed space such as a pipe includes a combination of articulated gripping and locomotive modules. Each gripping module includes an actuator mechanically linked to gripping members such that axial forces produced by the actuator are translated to radial forces in the gripping members, whereby the gripping members are caused to alternately hold and release the engagement of the robotic apparatus with surfaces of the enclosed space. Each locomotive module includes one or more actuators adapted to alternatively expand and contract the length of the locomotive module. The sequence of operations of the gripping and locomotive modules can be controlled such that the robotic apparatus can crawl through the enclosed space in an inchworm-like fashion and is capable of navigating turns and traversing inclines.

US Patent:

6518077, Feb 11, 2003

Filed:

Jan 15, 2002

Appl. No.:

10/050077

Inventors:

Jagdish Narayan - Raleigh NC
Ajay Kumar Sharma - Hillsboro OR
John F. Muth - Cary NC

Assignee:

North Carolina State University - Raleigh NC

International Classification:

H01L 2100

US Classification:

438 22, 438 20, 257 96

Abstract:

An electronic device has an alloy layer containing magnesium oxide and at least one of zinc oxide and cadmium oxide and having a cubic structure on a substrate. The alloy layer may be directly on the substrate or, alternatively, one or more buffer layers may be between the alloy layer and the substrate. The alloy layer may be domain-matched epitaxially grown directly on the substrate, or may be lattice-matched epitaxially grown directly on the buffer layer. The cubic layer may also be used to form single and multiple quantum wells. Accordingly, electronic devices having wider bandgap, increased binding energy of excitons, and/or reduced density of growth and/or misfit dislocations in the active layers as compared with conventional III-nitride electronic devices may be provided.

US Patent:

6852395, Feb 8, 2005

Filed:

Jan 8, 2002

Appl. No.:

10/041248

Inventors:

Anuj Dhawan - Raleigh NC, US
Tushar Kanti Ghosh - Raleigh NC, US
John Muth - Raleigh NC, US
Abdelfattah Seyam - Cary NC, US

Assignee:

North Carolina State University - Raleigh NC

International Classification:

B32B007/00

US Classification:

428196, 428198, 442229, 442301, 442377, 442414

Abstract:

Methods and systems for selectively connecting and disconnecting conductors in a fabric are disclosed. First and second conductors are integrated into a fabric such that the conductors intersect at a crossover point. The conductors are bonded to each other at the crossover point to improve AC and DC characteristics. Disconnect areas may be provided near the crossover point to allow selective disconnection of the conductors from the crossover point.

US Patent:

7329323, Feb 12, 2008

Filed:

Nov 19, 2004

Appl. No.:

10/993452

Inventors:

Anuj Dhawan - Raleigh NC, US
Tushar Kanti Ghosh - Raleigh NC, US
John Muth - Raleigh NC, US
Abdelfattah Seyam - Cary NC, US

Assignee:

North Carolina State University - Raleigh NC

International Classification:

B32B 37/00

US Classification:

156 731, 1562728, 428196, 428198

Abstract:

Methods and systems for selectively connecting and disconnecting conductors in a fabric are disclosed. First and second conductors are integrated into a fabric such that the conductors intersect at a crossover point. The conductors are bonded to each other at the crossover point to improve AC and DC characteristics. Disconnect areas may be provided near the crossover point to allow selective disconnection of the conductors from the crossover point.

US Patent:

7348285, Mar 25, 2008

Filed:

Jun 27, 2003

Appl. No.:

10/609074

Inventors:

Anuj Dhawan - Raleigh NC, US
Tushar K. Ghosh - Cary NC, US
Abdelfattah M. Seyam - Cary NC, US
John Muth - Raleigh NC, US

Assignee:

North Carolina State University - Raleigh NC

International Classification:

D03D 15/02

US Classification:

442229, 442 4, 442 6, 442189, 442228, 442301, 174107, 174108, 57210, 57211, 426377, 426592, 333123, 333160, 333206

Abstract:

Coaxial and twisted pair conductive yarn structures reduce signal crosstalk between adjacent lines in woven electrical networks. A coaxial conductive yarn structure includes an inner conductive yarn having a plurality of conductive strands twisted together. An outer conductive yarn is wrapped around the inner conductive yarn. An insulating layer separates the inner and outer yarns. A twisted pair conductive yarn structure includes first and second conductive yarns, each including a plurality of conductive strands being twisted together. The first and second conductive yarns are twisted together to form a helical structure. In a woven electrical network, at least one conductor of adjacent conductive yarn structures is connected to ground to reduce signal crosstalk. Coaxial and twisted pair yarn structures may also be formed simultaneously with weaving or knitting the threads that make up the structures into a fabric.

US Patent:

20070029643, Feb 8, 2007

Filed:

Mar 22, 2004

Appl. No.:

10/550178

Inventors:

Mark Johnson - Raleigh NC, US
Douglas Barlage - Durham NC, US
John Muth - Cary NC, US

International Classification:

H01L 23/58

US Classification:

257651000, 977936000, 257E21400

Abstract:

Methods, and structures formed thereby, are disclosed for forming laterally grown structures with nanoscale dimensions from nanoscale arrays which can be patterned from nanoscale lithography. The structures and methods disclosed herein have applications with electronic, photonic, molecular electronic, spintronic, microfluidic or nano-mechanical (NEMS) technologies. The spacing between laterally grown structures can be a nanoscale measurement, for example with a spacing distance which can be approximately 1-50 nm, and more particularly can be from approximately 3-5 nm. This spacing is appropriate for integration of molecular electronic devices. The pitch between posts can be less than the average distance characteristic between dislocation defects for example in GaN (ρ=10/cm→d=0.1 μm) resulting an overall reduction in defect density. Large-scale integration of nanoscale devices can be achieved using lithographic equipment that is orders of magnitude less expensive that that used for advanced lithographic techniques, such as electron beam lithography.

US Patent:

20080129980, Jun 5, 2008

Filed:

Nov 30, 2007

Appl. No.:

11/948970

Inventors:

ANUJ DHAWAN - Raleigh NC, US
John Muth - Cary NC, US

International Classification:

G01C 3/14

US Classification:

356 12

Abstract:

In-line fiber optic structure devices for use as environmental sensors and methods of fabricating in-line fiber optic structures as environmental sensors are disclosed and provided. According to some embodiments, fiber optic sensor devices can utilize the interaction of surface plasmons or evanescent waves with a surrounding environment. Fiber optic sensors according to some embodiments of the present invention provide an optical fiber with a long environmental interaction length having improved structural integrity. Graded-index optical fiber elements can be used as lenses and a coreless optical fiber element can act as an environmental interaction or sensing area. Graded-index and coreless optical elements can be fused to provide a continuous fiber optic sensing system. Other various embodiments are also claimed and described.