Charles J Barnett

US Patent:

20060166246, Jul 27, 2006

Filed:

Feb 15, 2006

Appl. No.:

11/334885

Inventors:

Charles Barnett - Derwood MD, US
James Beck - Research Triangle Park NC, US
Christy Perry - Apex NC, US

International Classification:

C12Q 1/68
C07H 21/04

US Classification:

435006000, 536024100

Abstract:

The present invention relates to the use of primers in polymerase chain reaction assays for the detection of fungal pathogens spp., and . Specific primers are identified as being useful for the identification of fungal isolates using PCR based techniques. Also described are novel extraction buffer solutions for use in isolating DNA from an organism, methods of extracting DNA from tissue, and methods of performing PCR analysis on DNA extracted from tissue.

US Patent:

62160095, Apr 10, 2001

Filed:

Apr 10, 1997

Appl. No.:

8/838586

Inventors:

Charles Barnett - Sterling VA

Assignee:

Hughes Electronics Corporation - El Segundo CA

International Classification:

H04B 700

US Classification:

455510

Abstract:

A base transceiver station has a signal strength receiver and is capable of transmitting a directed retry signal. A processor connects to the signal strength receiver and compares a received signal strength to a predefined threshold. The processor causes the base transceiver station to send the directed retry signal if the received signal strength is less than the predefined threshold. A method is provided where a characteristic of a signal received at a base transceiver station is measured and compared to a predefined threshold. A directed retry is sent if the signal characteristic is less than the predefined threshold, and a communication channel is established if a response to the directed retry is received at the base transceiver station.

US Patent:

54229332, Jun 6, 1995

Filed:

Sep 9, 1993

Appl. No.:

8/118560

Inventors:

Charles A. Barnett - Sterling VA
Stanley E. Kay - Rockville MD
Lou King - Mt. Airy MD
Ashok D. Mehta - North Potomac MD

Assignee:

Hughes Aircraft Compnay - Los Angeles CA

International Classification:

H04M 1100

US Classification:

379 60

Abstract:

A method and system for handing off an on-going communication from a serving cell to a neighboring cell of a cellular communication system having scanning receivers associated with each base transceiver station. A dynamic threshold is calculated for effecting the handoff in accordance with various operating conditions. The current mobile minimum attentuation level, (MT) the minimum permissible attenuation level of a serving (MS) cell and a neighboring cell (MN), together with the RF signal strength of the mobile unit at the neighboring cell (RSSI-NBR) and the serving cell (RSSI-SRV) are used in calculating a dynamic threshold (RSSI-THP).

US Patent:

53675592, Nov 22, 1994

Filed:

May 11, 1992

Appl. No.:

7/881271

Inventors:

Stanley Kay - Rockville MD
Youngky Kim - N. Potomac MD
Lou King - Mt. Airy MD
Ashok D. Mehta - Gaithersburg MD
Charles Barnett - Sterling VA

Assignee:

Hughes Aircraft Company - Los Angeles CA

International Classification:

H04M 1100

US Classification:

379 60

Abstract:

Cellular handoff is improved by tailing or adapting the measurement time based on the characteristics of the received signal intensity or power. More particularly, base stations typically measure mobile signal power in order to determine the necessity for handoff and the identity of a new cell. The measurement time must be of a duration which is sufficient to characterize the environment of the mobile. In accordance with the invention, the duration of the measurement time is determined from the received signal itself. Once the duration of the measurement time is determined, that data may be passed to a target cell along with other handoff data.

US Patent:

54836697, Jan 9, 1996

Filed:

Sep 9, 1993

Appl. No.:

8/118554

Inventors:

Charles A. Barnett - Sterling VA
Stanley E. Kay - Rockville MD
Lou King - Mt. Airy MD
Ashok D. Mehta - North Potomac MD

Assignee:

Hughes Aircraft Company - Los Angeles CA

International Classification:

H04B 726
H04Q 722

US Classification:

455 332

Abstract:

A method and system for handing off an on-going communication from a serving cell to a neighboring cell of a cellular communication system having mobile units with a scanning capability. A dynamic threshold is calculated for effecting the handoff under certain operating criteria. The minimum attenuation level of the mobile unit and the minimum level permitted by a neighboring cell is used in selecting the dynamic threshold.

US Patent:

55090516, Apr 16, 1996

Filed:

Sep 9, 1993

Appl. No.:

8/118710

Inventors:

Charles A. Barnett - Sterling VA
Ashok D. Mehta - North Potomac MD
Lou King - Mt. Airy MD

Assignee:

Hughes Aircraft Company - Los Angeles CA

International Classification:

H04B 100

US Classification:

379 59

Abstract:

Each cell has an assigned classification that determines its inclusion in a measurement list for handing off. The candidate cells, which are selected from the measurement list are given priority level assignments. The priority levels are implemented by the candidate neighboring cells measured RF signal strength; and the order of handing off is arranged in accordance with the adjusted RF signal strength.

US Patent:

54288169, Jun 27, 1995

Filed:

Sep 9, 1993

Appl. No.:

8/118555

Inventors:

Charles A. Barnett - Sterling VA
Naresh Durvasula - Gaithersburg MA

Assignee:

Hughes Aircraft Company - Los Angeles CA

International Classification:

H04B 726

US Classification:

455 332

Abstract:

A method and system for selecting the best handoff candidate cell at times when the number of neighboring cells that meet the measurement criteria is greater than twelve a measurement list is generated. The cells are assigned a handoff measurement priority wherein a handoff priority of zero is assigned to 12-N cells where N is between 1 and 6. A priority of 8 is assigned to the worst N cells. A new measurement list is generated using the 12-N cells and other unreported cells having a higher priority than the N worst cells.

US Patent:

55576575, Sep 17, 1996

Filed:

Sep 9, 1993

Appl. No.:

8/118548

Inventors:

Charles A. Barnett - Sterling VA

Assignee:

Hughes Aircraft Company - Los Angeles CA

International Classification:

H04Q 738

US Classification:

379 60

Abstract:

A mechanism for handing off between an overlay cell (48) and an underlay cell (50). The underlay cell (50) is smaller than and has a common area with the overlay cell. A threshold level (RSSI-THP) is established which corresponds to the sum of a nominal threshold level (RSSI-U) and a value obtained by subtracting the current attenuation level (MT) from the minimum attenuation level permitted by the underlay cell (MU). If the RF signal level of the serving cell (RSSI-SRV) is greater than the established threshold level (RSSI-THP), the mobile unit is handed off to the underlay cell (50), if not already in that cell; and handed off to the overlay cell (48) if equal to or less than the established threshold level (RSSI-THP), if not already in that cell.