John A Pettit

US Patent:

7286210, Oct 23, 2007

Filed:

Dec 30, 2004

Appl. No.:

11/024406

Inventors:

John W. Pettit - Rockville MD, US

International Classification:

G01L 7/00

US Classification:

356 32, 356432, 356445, 73800

Abstract:

A passive optical sensor operates independently of light amplitude by using a semiconducting carbon nanotube material. The material has an optical property dependent on wavelength, e. g. , wavelength of absorption, ratio of absorptions at two wavelengths, or fluorescence at one wavelength in response to light at another wavelength. The property is changed by compressing the material or exposing the material to a charge. Light is passed through the material so that the change in the property can be detected.

US Patent:

8013359, Sep 6, 2011

Filed:

Dec 30, 2004

Appl. No.:

11/024410

Inventors:

John W. Pettit - Rockville MD, US

International Classification:

H01L 31/111

US Classification:

257116

Abstract:

A power switching device includes an optically controlled component using a semiconducting carbon nanotube. An optical signal transmitted over an optical fiber controls the conductivity of the nanotube. The nanotube transmits a signal controlled by the optical signal to a wide-bandgap semiconductor power switch, which switches the power.

US Patent:

8218930, Jul 10, 2012

Filed:

Apr 5, 2006

Appl. No.:

11/397933

Inventors:

John W. Pettit - Rockville MD, US

International Classification:

G02B 6/00
G02B 6/36

US Classification:

385128, 385141, 4271631

Abstract:

An optical fiber is coated with a super-hydrophobic carbon nanotube film, or other film containing a nanocomposite material, to increase reliability. The film is formed from a carbon nanotube dispersion, which is in turn formed from a mixture of water, carbon nanotube gel, and a polymer such as single stranded DNA of a repeating sequence of the base pairs GT with a length of 20 base pairs, which is sonicated and then ultracentrifuged.

US Patent:

8380018, Feb 19, 2013

Filed:

Jun 3, 2011

Appl. No.:

13/152857

Inventors:

John W. Pettit - Rockville MD, US

International Classification:

G02F 1/295
G02B 6/34

US Classification:

385 10, 385 4, 385 8, 385 9, 385 12, 385 15, 385 16, 385 31, 385 37

Abstract:

A conductive polymer and a semiconducting carbon nanotube material are combined to form a highly conductive composite. The composite can be used for EMI shielding, optical sensing, optical switching, and other uses.

US Patent:

20050129178, Jun 16, 2005

Filed:

Dec 16, 2003

Appl. No.:

10/735707

Inventors:

John Pettit - Rockville MD, US

International Classification:

H01J035/00
H01J035/22
H01J035/32

US Classification:

378122000

Abstract:

A synthetic radiation source uses a carbon nanotube material as a cold cathode for generation of x-rays. The synthetic radiation source has permits the use of solid-state detectors, improved calibration for detector current leakage, and phase locked detection. The source can be used in numerous areas, such as the detection of thickness and mass per unit area of cigarette paper.

US Patent:

20050249249, Nov 10, 2005

Filed:

Dec 30, 2004

Appl. No.:

11/024409

Inventors:

John Pettit - Rockville MD, US

International Classification:

H01S003/10

US Classification:

372020000, 398043000

Abstract:

In a narrow band light source, the optical emission wavelength is adjusted and stabilized based upon one or more carbon nanotube ambipolar FETs where electrons and holes combine to emit light at the nanotube bandgap and a component adapted to change and control the nanotube bandgap by physical distortion, bending or chemical and electrical effects. A feedback loop can be included to stabilize or scan the wavelength. In a network using such light sources, some of the sources can be held in reserve in case others fail.

US Patent:

20110065101, Mar 17, 2011

Filed:

Mar 2, 2010

Appl. No.:

12/659251

Inventors:

H. Randall Bell - Arlington VA, US
Joan Bienvenue - Fredericksburg VA, US
James P. Landers - Charlottesville VA, US
John W. Pettit - Gaithersburg MD, US
Abby MacKness - McLean VA, US

Assignee:

LOCKHEED MARTIN CORPORATION - Bethesda MD

International Classification:

C12Q 1/68
C12M 1/34

US Classification:

435 6, 4352872

Abstract:

Aspects of the disclosure provide a microfluidic chip. The microfluidic chip includes a first domain configured for polymerase chain reaction (PCR) amplification of DNA fragments, and a second domain for electrophoretic separation. The first domain includes at least a first reaction reservoir designated for PCR amplification based on a first sample, and a second reaction reservoir designated for PCR amplification based on a second sample. The second domain includes at least a first separation unit coupled to the first reaction reservoir to received first amplified DNA fragments based on the first sample, and a second separation unit coupled to the second reaction reservoir to received second amplified DNA fragments based on the second sample. The first separation unit is configured to perform electrophoretic separation for the first amplified DNA fragments, and the second separation unit is configured to perform electrophoretic separation for the second amplified DNA fragments.

US Patent:

20110070578, Mar 24, 2011

Filed:

Mar 10, 2010

Appl. No.:

12/659488

Inventors:

H. Randall Bell - Arlington VA, US
Abby MacKness - McLean VA, US
Joan Bienvenue - Fredericksburg VA, US
John W. Pettit - Derwood MD, US
James P. Landers - Charlottesville VA, US

Assignee:

LOCKHEED MARTIN CORPORATION - Bethesda MD

International Classification:

C12Q 1/68
C12M 1/00

US Classification:

435 6, 4352891, 4352872

Abstract:

Aspects of the disclosure provide a microfluidic chip to facilitate DNA analysis. The microfluidic chip includes a first domain configured for polymerase chain reaction (PCR) amplification of DNA fragments, a dilution domain coupled to the first domain to dilute a PCR mixture received from the first domain, and a second domain that is coupled to the dilution domain so as to receive the amplified DNA fragments. The second domain includes a separation channel that is configured to perform electrophoretic separation of the amplified DNA fragments. In addition, the disclosure provides a DNA analyzer to act on the microfluidic chip to perform an integrated single chip DNA analysis.