Patents
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Abraham P. Lee,
Asuncion V. Lemoff
Micromachined Magnetohydrodynamic Actuators and
Sensors
U.S. Patent 6,146,103
November 14, 2000
A magnetohydrodynamic (MHD) micropump and microsensor that uses
micromachining to integrate the electrodes with microchannels and
includes a magnet for producing magnetic fields perpendicular to
both the electrical current direction and the fluid flow direction.
The magnet can also be micromachined and integrated with the micropump
using existing technology. The MHD micropump, for example, can generate
continuous, reversible flow, with readily controllable flow rates.
The flow can be reversed by either reversing the electrical current
flow or reversing the magnetic field. By mismatching the electrodes,
a swirling vortex flow can be generated for potential mixing applications.
No moving parts are necessary, and the dead volume is minimal. The
micropumps can be placed at any position in fluidic circuit, and
a combination of micropumps can generate fluidic plugs and valves.
James G. Berryman,
William D. Daily, Abelardo L. Ramirez, Jeffery J. Roberts
Using Electrical Impedance Tomography to Map Subsurface
Hydraulic Conductivity
U.S. Patent 6,147,497 November 14, 2000 Electrical impedance tomography
(EIT) can be used to map hydraulic conductivity in the subsurface
where measurements of both amplitude and phase are made. Hydraulic
conductivity depends on at least two parameters: porosity and a
length-scale parameter. Electrical resistance tomography (ERT) measures
and maps electrical conductivity (which can be related to porosity)
in three dimensions. The desired additional measurement of a pertinent
length scale can be achieved by introducing phase measurements along
with amplitude. Hydraulic conductivity controls the ability to flush
unwanted fluid contaminants from the surface. Thus, inexpensive
maps of hydraulic conductivity would improve planning strategies
for subsequent remediation efforts. Fluid permeability is also of
importance for oil-field exploitation, and thus, detailed knowledge
of fluid permeability distribution in three dimensions would be
a useful to petroleum reservoir analysts.
Layton C. Hale,
Terry Malsbury, Russell M. Hudyma, John M. Parker
Projection Optics Box
U.S. Patent 6,147,818
November 14, 2000
A projection optics box or assembly for use in an optical assembly,
such as in an extreme ultraviolet lithography (EUVL) system using
10- to 14-nanometer soft x-ray photons. The box uses numerous highly
reflective optics or mirrors. Each is mounted on a precision actuator,
and each reflects an optical image, such as from a mask, in the
EUVL system onto a point of use, such as a target or silicon wafer.
The mask would have received an optical signal from a source assembly
via a series of the EUVL systemÕs highly reflective mirrors. Most
of the highly reflective optics or mirrors are mounted in a housing
assembly comprising a series of bulkheads whose walls have been
secured together for maximum rigidity. Because of the precision
actuators, the mirrors must be positioned precisely and remotely
in tip, tilt, and piston (three degrees of freedom), while also
providing exact constraint.
Daniel M. Makowiecki,
John A. Kerns, Craig S. Alford, Mark A. McKernan
Apparatus for Coating Powders
U.S. Patent 6,149,785
November 21, 2000
A process and apparatus for coating small particles and fibers.
The process involves agitating the particles or fibers to promote
uniform coating, removing adsorbed gases and static charges from
the particles or fibers by an initial plasma cleaning, and coating
the particles or fibers with one or more coatings. A first coating
is an adhesion coating, and subsequent coatings are deposited in
situ to prevent contamination at layer interfaces. The first coating
is of an adhesion-forming element (tungsten, zirconium, rhenium,
chromium, titanium) that is 10 to 10,000 nanometers thick. The second
or final coating is composed of multiple materials from 0.1 to 10
micrometers thick, which could be, for example, of copper or silver
for brazing processes or of other desired materials that define
the new surface-related properties of the particles. An essential
feature of the coating process is the capability to deposit in situ
without interruption so that a contaminated interface that could
adversely affect the coating adhesion is not formed. The process
may include screening of the material to be coated and either continuous
or intermittent vibration to prevent agglomeration of the material
to be coated.
Stephen P. Vernons
Defect-Tolerant Transmission Lithography Mask
U.S. Patent 6,150,060
November 21, 2000
A transmission lithography mask that uses a transparent substrate
or a partially transparent membrane as the active region of the
mask. A reflective single-layer or multilayer coating is deposited
on the membrane surface facing the illumination system. The coating
is selectively patterned (removed) to form transmissive (bright)
regions. Structural imperfections and defects in the coating have
a negligible effect on the aerial image of the mask master pattern
because the coating is used to reflect radiation out of the entrance
pupil of the imaging system. Similarly, structural imperfections
in the clear regions of the membrane have little influence on the
amplitude or phase of the transmitted electromagnetic fields. Because
the mask discards, rather than absorbs, unwanted radiation, it has
reduced optical absorption and reduced thermal loading compared
with those in conventional designs. For extreme ultraviolet applications,
the mask circumvents the phase defect problem and is independent
of the thermal loading during exposure.
Michael D. Perry,
Brent C. Stuart, Paul S. Banks, Booth R. Myers, Joseph A. Sefcik
Laser Machining of Explosives
U.S. Patent 6,150,630
November 21, 2000
The invention consists of a method for machining (cutting, drilling,
sculpting) explosives. By using laser pulses of a duration from
5 femtoseconds to 50 picoseconds, extremely precise and rapid machining
can be achieved with essentially no heat or shock effects. The material
is in essence converted from its initial solid state directly into
a fully ionized plasma on a time scale too short for thermal equilibrium
to be established with the lattice. As a result, heat conduction
beyond the region removed is negligible, resulting in a negligible
thermal stress or shock to the material beyond a few micrometers
from the laser-machined surface. Hydrodynamic expansion of the plasma
eliminates the need for any ancillary techniques to remove material
and produces extremely high-quality machined surfaces. The explosive
does not detonate or deflagrate in the process, and the material
that is removed is rendered inert.
James C. Davidson,
Joseph W. Balch
Extended-Length Microchannels for High-Density,
High-Throughput Electrophoresis Systems
U.S. Patent 6,153,076
November 28, 2000
High-throughput electrophoresis systems that provide extended well-to-read
distances on smaller substrates, thus compacting the overall systems.
The electrophoresis systems use a high-density array of microchannels
for electrophoresis analysis with extended read lengths. The microchannel
geometry can be used individually or in conjunction with others
to increase the effective length of a separation channel while minimally
affecting the packing density of channels. One embodiment uses sinusoidal
microchannels while another embodiment uses plural microchannels
interconnected by a via. The extended channel systems can be applied
to virtually any type of channel-confined chromatography.
Alan F. Jankowski,
Anthony P. Schmid
Titanium–Chromium–Aluminum–Oxygen
Thin-Film Resistors
U.S. Patent 6,154,119
November 28, 2000
Thin films of titanium–chromium–aluminum–oxygen (Ti–Cr–Al–O) are
used as a resistor material. The films are radiofrequency-sputter-deposited
from ceramic targets using a reactive working gas mixture of argon
and oxygen. Resistivity values from 10 thousand to 10 million ohm-centimeters
have been measured for Ti–Cr–Al–O film less than 1 micrometer thick.
The film resistivity can be discretely selected through control
of the target composition and the deposition parameters. The application
of Ti–Cr–Al–O as a thin-film resistor has been found to be thermodynamically
stable, unlike other metal-oxide films. The Ti–Cr–Al–O film can
be used as a vertical or lateral resistor (for example, as a layer
beneath a field-emission cathode in a flat-panel display) or as
a means of controlling surface emissivity (for example, as a coating
on an insulating material such as vertical wall supports in flat-panel
displays).
Raymond P. Mariella,
Jr.
Waveguide Detection of Right-Angle-Scattered Light
in Flow Cytometry
U.S Patent 6,154,276
November 28, 2000
A transparent flow cell is used as an index-guided optical waveguide.
A detector for the flow cell (but not for the liquid stream) detects
the right-angle-scattered (RAS) light exiting from one end of the
flow cell. The detector(s) could view the trapped RAS light from
the flow cell either directly or through intermediate optical light
guides. If the light exits one end of the flow cell, then the other
end of the flow cell can be given a high-reflectivity coating to
approximately double the amount of light collected. This system
is more robust in its alignment than the traditional flow-cytometry
systems that use imaging optics, such as microscope objectives.
John F. Poco,
Lawrence W. Hrubesh
Method of Producing Optical-Quality Glass Having
a Selected Refractive Index
U.S. Patent 6,158,244 December 12, 2000 Optical-quality glass having
a selected refractive index is produced by a two-stage drying process.
A gel is produced using sol-gel chemistry techniques and first dried
by controlled evaporation until the gel volume reaches a preselected
value. The preselected volume determines the density and refractive
index of the finally dried gel. The gel is refilled with solvent
in a saturated vapor environment and then dried again by supercritical
extraction of the solvent to form a glass. The glass has a refractive
index less than that of the full density of glass. The range of
achievable refractive indexes depends on the composition of the
glass. Glasses having different refractive indexes chosen from an
uninterrupted range of values can be produced from a single precursor
solution.
Raymond J. Beach,
Eric C. Honea, Camille Bibeau, Scott Mitchell, John Lang, Dennis
Maderas, Joel Speth, Stephen A. Payne
Hollow Lensing Duct
U.S. Patent 6,160,934
December 12, 2000
A hollow-lensing-duct method of condensing (intensifying) light
that combines focusing using a spherical or cylindrical lens followed
by reflective waveguiding. The hollow duct tapers down from a wide
input side to a narrow output side, with the input side consisting
of a lens that may be coated with an antireflective coating for
more efficient transmission into the duct. The inside surfaces of
the hollow lens duct are appropriately coated to be reflective,
preventing light from escaping by reflection as it travels along
the duct (reflective waveguiding). The hollow duct has various applications
for intensifying light, such as in the coupling of diode-array-pumped
light to solid-state lasing materials.
M. Leslie Carman,
Robert T. Taylor
In Situ Microbial Filter Used for Bioremediation
U.S. Patent 6,165,356
December 26, 2000
An improved method for in situ microbial filter bioremediation that
increases the operational longevity of an in situ microbial filter
emplaced into an aquifer. A method for generating a microbial filter
of sufficient catalytic density and thickness, which has an increased
replenishment interval, improved bacteria attachment and detachment
characteristics, and endogenous stability under in situ conditions.
A system for in situ water remediation.
Stefan P. Swierkowski
Integrated Titer Plate-Injector Head for Microdrop
Array Preparation, Storage, and Transfer
U.S. Patent 6,165,417
December 26, 2000
An integrated titer plate-injector head for preparing and storing
two-dimensional (2D) arrays of microdrops and for ejecting some
or all of the microdrops and inserting them into 2D arrays of deposition
sites with micrometer precision. The titer plate-injector head includes
integrated precision-formed nozzles with appropriate hydrophobic
surface features and evaporative constraints. A reusable pressure
head with a pressure equalizing feature is added to the titer plate
to perform simultaneous precision sample ejection. The titer plate-injector
head may be used in various applications, including capillary electrophoresis,
chemical flow injection analysis, and microsample array preparation.
Ralph H. Page,
Raymond J. Beach
Thermal Lens Elimination by Gradient-Reduced Zone
Coupling of Optical Beams
U.S. Patent 6,167,069
December 26, 2000
A thermal-gradient-reduced zone laser that includes a laser medium
and an optically transparent plate with an index of refraction that
is less than the index of refraction of the laser medium. The pump
face of the laser medium is bonded to a surface of the optically
transparent member. Pump light is directed through the transparent
plate to optically pump the solid-state laser medium. Heat conduction
is mainly through the surface of the laser medium, where the heat
is introduced by the pump light. Heat flows in a direction opposite
that of the pump light because the side of the laser medium that
is opposite the pump face is not in thermal contact with a conductor;
thus, there is no heat flux (and no temperature gradient), and a
thermal-gradient-reduced zone is produced. A laser cavity is formed
around the laser medium such that laser light oscillating within
the laser cavity reflects by total internal reflection from the
interface between the pump face and the optically transparent plate
and enters and exits through a thermal-gradient-reduced zone.
John F. Poco,
Lawrence W. Hrubesh
Method of Casting Patterned Dielectric Structures
U.S. Patent 6,168,737
B1 January 2, 2001
A pattern of dielectric structures is formed directly on a substrate
in a single step using sol-gel chemistry and molding procedures.
The resulting dielectric structures are useful in vacuum applications
for electronic devices. Porous, lightweight structures having a
high aspect ratio that are suitable for use as spacers between the
faceplate and baseplate of a field emission display can be manufactured
using this method.
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