James W Joyce

US Patent:

H12823, Feb 1, 1994

Filed:

Feb 5, 1990

Appl. No.:

7/474603

Inventors:

James W. Joyce - Rockville MD
George Mon - Potomac MD

Assignee:

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

International Classification:

A61M 1600

US Classification:

12820423

Abstract:

A fluidic, volume-cycled respirator circuit comprising a fluidic flowmeter, a tidal volume selection controller and an inlet valve. The flowmeter is connected to the controller through a transmitting means which transmits gas flow frequency signals. Said controller is then connected to the inlet valve, which is connected back to the flowmeter; hence, the respirator circuit is complete. The tidal volume selection controller may operate by either fluidics, electronics, or the combination of the two. The flowmeter facilitates supply of air to the patient. The amount of air supplied is controlled by the tidal volume selection controller which senses inspiration and gas flow frequency. The controller is equipped with a timer back-up system in the event that either the system or the patient fail to respond. The valve is operated at the direction of the tidal volume selection controller. The valve is open during the inspiratory phase and closed during the exhalation phase.

US Patent:

41007891, Jul 18, 1978

Filed:

Jul 28, 1977

Appl. No.:

5/819745

Inventors:

James W. Joyce - Rockville MD

Assignee:

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

International Classification:

G01N 3100

US Classification:

73 23

Abstract:

A fluidic partial pressure sensor for obtaining a direct indication of the partial pressure of a gas constituent in a mixture relative to a reference gas. A fluidic bridge's geometry is so designed and structured that if the pressure across the bridge is maintained constant, the pressure differential between the two channels thereby becomes directly proportional to the partial pressure of the gas constituent of interest. A typical bridge sensor therefore can provide a direct indication of partial pressure. The geometry of the bridge network is chosen so that the sensor gain constant varies linearly with ambient pressure.

US Patent:

50762842, Dec 31, 1991

Filed:

Oct 23, 1990

Appl. No.:

7/607432

Inventors:

James W. Joyce - Rockville MD
Nassy Srour - Silver Spring MD
Michael V. Scanlon - Springfield VA
Stephen M. Tenney - Rockville MD
George Mon - Potomac MD
John P. Gills - Washington DC

Assignee:

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

International Classification:

A61B 702

US Classification:

128773

Abstract:

A heart-sound monitor and esophageal stethoscope which makes use of fluidic aminar proportional amplifiers (LPAs). These LPA's are used to sense and amplify incoming acoustic pressure signals, such as heart signals. Moreover, the fluidic monitor is able to monitor a fetus heartbeat while eliminating the acoustic interference present from the mother's heartbeat. In this case, the LPA acts not only as an amplifier, but as an acoustic filter as well.

US Patent:

51649195, Nov 17, 1992

Filed:

Dec 6, 1991

Appl. No.:

7/802796

Inventors:

Michael Scanlon - Springfield VA
Stephen M. Tenney - Rockville MD
Nassy Srour - Silver Spring MD
James W. Joyce - Rockville MD

Assignee:

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

International Classification:

H04R 1500

US Classification:

367135

Abstract:

A sonar sensor comprising a substantially non-corrodible housing and a fluidic gainblock disposed therein. In addition, one or more fluid-filled laminar proportional amplifiers are arranged either in series or in parallel and contained within the fluidic gainblock. Means are provided to produce a jet within each laminar proportional amplifier, which is then modulated by incoming acoustic signals. The pressure caused by diverting the jet from its equilibrium path is proportional to, but greater than, the incoming acoustic signal. Hydrophones are used to convert the amplified acoustic signal into an electrical signal. In one embodiment, the fluidic gainblock is free-flooded and open to the liquid environment in which it is used, obviating the need for pressure equalization. In another embodiment, the fluidic gainblock is provided with filtering means for prevent the accumulation of sediment within the cavities making up the laminar proportional amplifiers. In yet another embodiment, the fluidic gainblock is a closed-system which recirculates its fluid supply, increasing the sensor's operating life and isolating the laminar proportional amplifiers therein.

US Patent:

47169362, Jan 5, 1988

Filed:

Dec 22, 1986

Appl. No.:

6/946479

Inventors:

George Mon - Potomac MD
James W. Joyce - Rockville MD

Assignee:

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

International Classification:

F15C 106
F15C 108

US Classification:

137833

Abstract:

A fluidic system is provided in which the laminar flow operating range has een increased. The fluidic system uses stacks of laminate plates in which filter means is placed between vent and exhaust laminates for breaking up eddies and flow noise created from supply nozzle and vent areas.