DEXTER GRAHAM SMITH
Pilots at Grn Mdw Dr, Columbia, MD

5502869, Apr 2, 1996

Oct 27, 1994

8/329921

Dexter G. Smith - Columbia MD
Christopher P. Nowicki - Elkridge MD
Michael F. Arnold - Westminster MD

Noise Cancellation Technologies, Inc. - Linthicum MD

A47L 900

15326

An ultra quiet vacuum cleaner having a bag cavity (44), a motor/blower chamber (48) connected to said cavity by a flexible coupling (47) and an active, adaptive noise cancellation controller (52) so configured to quiet the exhaust of the air used to cool the motor/blower unit. Fast compensation and feedback compensation allow use of a straight, short duct (51) for superior cancellation performance.

6765527, Jul 20, 2004

Jan 31, 2002

10/048769

Daniel G. Jablonski - Bethesda MD
Harvey W. Ko - Ellicott City MD
Douglas A. Oursler - Columbia MD
Dexter G. Smith - Columbia MD
David M. White - Sivler Spring MD

The Johns Hopkins University - Baltimore MD

G01S 1304

342193, 342 22

A harmonic radar nonlinear junction detector system for detecting concealed weapons, electronics, and other man-made objects utilizing state-of-the art wireless technology, circuit fabrication, signal synthesis, and computer processing techniques to detect and characterize man-made objects possessing nonlinear junctions. The system transmits a pair of low power waveforms and a receiver within the system is coherently tuned to harmonics of the transmitted frequencies of the waveforms to detect man-made metal objects and electronics that contain non-linear junctions. The receiver is also capable of receiving inter-modulation products reflected from the man-made objects that are a result of using two incident signals. The system uses two signal sources generating user-definable waveforms of variable frequencies in order to provide enhanced discrimination and target identification abilities via the processing of returned inter-modulation products.

6647983, Nov 18, 2003

Mar 6, 2001

09/681248

Dexter G. Smith - Columbia MD
Michael P. Boyle - Severna Park MD
Protagoras N. Cutchis - Highland MD
William R. Allmon - Catonsville PA

The Johns Hopkins University - Baltimore MD

A62B 902

12820524, 12820511

A low-pressure valve enabling precise control of a fluid flow rate through the valve during cyclical operation of the valve. The valve is useful for controlling air delivery to a patient as part of a portable ventilator. The valve comprises a housing having an inlet and two outlets and. A wiper plate and an orifice plate are disposed inside of the housing. Transverse movement of the wiper plate relative to the orifice plate , powered for example by a servomotor , simultaneously and alternatively covers and uncovers various openings in the orifice plate. The total flow through the valve is thereby divided between the two outlets and.

5627746, May 6, 1997

Mar 1, 1995

8/367292

Eldon W. Ziegler - Clarksville MD
Dexter Smith - Columbia MD
Michael P. McLoughlin - Sykesville MD

Noise Cancellation Technologies, Inc. - Linthicum MD

G05B 1302, G06F 1700

364148

A simple, low cost active noise cancellation system employing a delay and actuator estimator (35), a gain determination (34), a gain (33) and speaker (36) that cancels stationary random noise such as that encountered on a rangehood fan.

2003000, Jan 9, 2003

Jan 15, 2002

10/031042

Dexter Smith - Columbia MD, US
Michael McLoughlin - Sykesville MD, US
Harvey Ko - Ellicott City MD, US

G08B021/00

340/540000, 367/013000, 367/199000

Disclosed is a method for detecting unwanted dissemination of acrosolized agents into an HVAC system in a building by detecting the sound of the dissemination at the time it occurs. To be able to distinguish the sound of the dissemination event from the ambient background noise of the HVAC system, sound extraction techniques, e.g., high pass filtering and an adaptive variance estimator, are utilized which can detect the event's noise from within the ambient background noise of the system. A microphone continually monitors background sound levels and senses the additional sound resulting from the activation of the aerosol delivery system, which has a unique sound “signature”. Once an event is detected, defensive actions, e.g., activating additional sensors, closing all air vents, and shutting off the HVAC system, can be taken.

6853194, Feb 8, 2005

Mar 20, 2001

10/181471

Carl V. Nelson - Rockville MD, US
Dexter G. Smith - Columbia MD, US

The Johns Hopkins University - Baltimore MD

G01V003/11

324329

A time-domain electromagnetic target discriminator (ETD) sensor system and method are provided capable of measuring a metal target's time decay response based on the physical parameters of the metal target and its environment and for identifying the metal target. The ETD sensor system includes a pulse transmitter connected to a receiver via a data acquisition and control system. The transmitter and receiver include coil configurations for placement in proximity to a visually obscured, e. g. , buried, metal target (or underground void) for inducing eddy currents within the metal target. The ETD sensor system measures the eddy current time decay response of the metal target in order to perform target recognition and classification. The identification process entails comparing the metal target's (or, underground void or other object's) time decay response with a library of normalized object signatures, e. g. , time decay responses and other characteristics.

2004025, Dec 16, 2004

Apr 14, 2004

10/492628

Dexter Smith - Columbia MD, US
Nicholas Evancich - Columbia MD, US
Michael McLoughlin - Sykesville MD, US
Douglas Wenstrand - Columbia MD, US

G01V001/18

367/066000

A high capacity digital geophone system capable of distributing seismic data over a computer network connection in a real-time manner. Each geophone can convert seismic energy signals to analog then digital data before forwarding the observed data to a network connection for dissemination. Moreover, each geophone may be embedded with a processing capability that allows for instant front end processing of data. Remote processing computers can then access geophone data over the network connection and feed it into software analysis applications.

6848444, Feb 1, 2005

Jul 31, 2001

09/920431

Dexter G. Smith - Columbia MD, US
Protagoras N. Cutchis - Highland MD, US
William P. Wiesmann - Washington DC, US
Loland A. Pranger - Montgomery Village MD, US

The Johns Hopkins University - Baltimore MD

A61M 1600

12820418, 12820421

An emergency life support system including a patient ventilator for mechanical breathing assistance; a capnograph to monitor COfor ventilation effectiveness; a pulse oximeter for measuring blood stream oxygen saturation; a carbon dioxide sensor; an electrocardiograph (ECG) to monitor cardiac performance; an infusion pump; and alarms and a data recorder. The preferred embodiment uses an oxygen generator to deliver oxygen, to generate electric power to run the ventilation system, and to warm IV fluids and resuscitated air. The generator has electronically controlled valves and a modified valve system that offers the ability to select the oxygen concentration in the air delivered to the patient.

6259224, Jul 10, 2001

Oct 18, 1996

8/733462

Dexter Smith - Columbia MD
Joseph Schwartz - Ellicott City MD
Eldon W. Ziegler - Clarksville MD

Noise Cancellation Technologies, Inc. - Linthicum MD

G05B 1101

318629

An active attenuation system for a DC motor which yields global vibration reduction of slot or other motor induced tonals at the plate on which the motor is mounted without modifying the construction of the motor. The system comprises one or more vibration sensors, a signal synchronized to the slot rate or other motor induced tonal rate, an electronic adaptive controller and the means to supply the control signal into the motor field and/or armature current.

5692054, Nov 25, 1997

Jun 30, 1995

8/411785

Michael J. Parrella - Weston CT
Dexter G. Smith - Columbia MD

Noise Cancellation Technologies, Inc. - Linthicum MD

G10K 1116

381 71

A repetitive noise cancellation system for multiple noise sources employing a controller (36) which senses radiated noise by reference sensors (35) and the status of the noise sources by position sensors (37, 38) and automatically controls one of the noise sources so that the noises being emitted from the multiple sources cancel one another.