Patents |
Jesse D. Wolfe, Steven D. Theiss, Paul G. Carey,
Patrick M. Smith, Paul Wickboldt
Thin Film Transistors on Plastic Substrates with Reflective Coatings
for Radiation Protection
U.S. Patent 6,642,085 B1
November 4, 2003
Fabrication of silicon thin-film transistors (TFTs) on low-temperature
plastic substrates using a reflective coating so that inexpensive
plastic substrates may be used in place of standard glass, quartz,
and silicon-wafer-based substrates. These TFTs can be used in large-area,
low-cost electronics, such as flat-panel displays, and in portable
electronics, such as video cameras, personal digital assistants,
and cell phones.
Ramakrishna S. Madabhushi, Stuart A. Gammon
Polyacrylamide Medium for the Electrophoretic Separation
of Biomolecules
U.S. Patent 6,646,084 B2
November 11, 2003
A polyacrylamide medium for the electrophoretic separation of biomolecules.
The polyacrylamide medium comprises high-molecular-weight polyacrylamides
(PAAm) with a viscosity average molecular weight of 675 to 725
kilodaltons, which were synthesized by the conventional redox polymerization
technique. Capillary electrophoresis of BigDye DNA sequencing standard
was then performed using this separation medium. A single base
resolution of about 725 bases was achieved in about 60 minutes
in a noncovalently coated capillary with an internal diameter of
50 micrometers, an effective length of 40 centimeters, and
a field of 160 volts per centimeter at 40°C. The resolution
achieved when this formation is used to separate DNA is much superior
(725 bases versus 625 bases) and faster (60 versus 75 minutes)
than when the commercially available PAAm is used under identical
conditions. The formulation method for synthesizing PAAm is straightforward
and simple, and it does not require cumbersome methods such as
emulsion polymerization to achieve very high molecular weights.
Also, with this formulation, PAAm does not have to be separated
from the reaction mixture before the polymer is reconstituted to
a final concentration. Furthermore, the formulation is prepared
from a single average-molecular-weight PAAm rather than from a
mixture of two different ones. Barry L. Freitas, Jay A. Skidmore
Ruggedized Microchannel-Cooled Laser Diode Array with Self-Aligned
Microlens
U.S. Patent 6,647,035 B1
November 11, 2003
A microchannel-cooled, optically corrected, laser diode array
is fabricated by mounting laser diode bars onto silicon surfaces.
This approach allows for the highest thermal impedance in a ruggedized,
low-cost assembly that includes passive microlens attachment
without
the need for lens frames. The microlensed laser diode array can
be used in all solid-state laser systems that require efficient,
directional pump sources with a narrow bandwidth and high-optical-power
density.
Luiz B. Da Silva, Charles L. Chase
Optical Probe with Light Fluctuation Protection
U.S. Patent 6,647,285
B2
November 11, 2003
An optical probe for tissue identification includes an elongated
body. Optical fibers are located within the elongated body
for transmitting light to and from the tissue. Light fluctuation
protection is associated with the optical fibers. In one embodiment,
a reflective
coating on the optical fibers reduces stray light. In another
embodiment, a filler with very high absorption is located within
the elongated
body between the optical fibers.
Conrad M. Yu
Thin Film Capillary Process and Apparatus
U.S. Patent 6,649,078
B2
November 18, 2003
Method and system of forming microfluidic capillaries in various
substrate materials. A first layer of a material such as
silicon dioxide is applied to a channel etched in a substrate.
A second,
sacrificial layer of a material such as a polymer is deposited
on the first layer. A third layer, which may be of the same
material as the first layer, is placed on the second layer.
The sacrificial
layer is then removed to form a smooth-walled capillary in
the substrate.
Anthony M. McCarthy
Silicon on Insulator Self-Aligned Transistors
U.S. Patent 6,649,977
B1
November 18, 2003
A method for fabricating thin-film, single-crystal silicon-on-insulator
(SOI) self-aligned transistors. Standard processing of
silicon substrates is used to fabricate the transistors. Physical
spaces between the source and gate and between the drain
and gate
are introduced by etching the polysilicon gate material.
These spaces
provide connecting implants, or bridges, that allow the
transistor
to perform normally. After the silicon substrate processing
is completed, the silicon wafer is bonded to an insulator
(glass) substrate, and the silicon substrate is removed,
leaving the
transistors on the insulator (glass) substrate. Transistors
fabricated
by this
method may be used, for example, in flat-panel displays.
Lloyd
A. Hackel, John M. Halpin, Fritz B. Harris, Jr.
Laser
Peening of Components of Thin Cross-Section
U.S. Patent 6,657,160
B2
December 2, 2003
The properties of a metal piece are altered by laser
peening. The first side of the piece is laser peened
using an acoustic
coupling
material that is operatively connected to the second
side. Then the second side is laser peened using
an acoustic coupling material
that is operatively connected to the first side.
Richard F.
Post
Passive Magnetic Bearing for a Horizontal Shaft
U.S. Patent 6,657,344
B2
December 2, 2003
A passive magnetic bearing is composed of a levitation element
and a restorative element. The levitation element has a pair
of stationary arcuate ferromagnetic segments located within an
annular
radial-field magnet array. The magnet array is attached to the
inner circumference of a hollow shaft end. An attractive force
between the arcuate segments and the magnet array acts vertically
to levitate the shaft and in a horizontal transverse direction
to center the shaft. The restorative element has an annular Halbach
array of magnets, and a stationary annular circuit array is located
within the Halbach array. The Halbach array is attached to the
inner circumference of the hollow shaft end. A repulsive force
between the Halbach array and the circuit array increases inversely
to the radial space between them and thus acts to restore the
shaft to its equilibrium axis of rotation when it is displaced
therefrom.
Kirk Patrick Seward
Bistable Microvalve and Microcatheter System
U.S. Patent 6,663,821
B2
December 16, 2003
A bistable microvalve of shape memory material is operatively
connected to a microcatheter. The bistable microvalve includes
a tip that
can be closed off until it is in the desired position. Once
it is in position, it can be opened and closed. The system uses
heat and pressure to open and close the microvalve. The shape
memory
material will change stiffness and shape when heated above
a
transition temperature. The shape memory material is adapted
to move from
a first shape to a second shape, either open or closed, where
it can perform a desired function.
Richard F. Post
Inductrack Magnet Configuration
U.S. Patent 6,664,880 B2
December 16, 2003
A magnet configuration comprising a pair of Halbach arrays
magnetically and structurally connected together are positioned
with respect
to each other so that a first component of their fields substantially
cancels at a first plane between them, and a second component
of their fields substantially adds at this first plane. A track
of
windings is located between the pair of Halbach arrays, and
a propulsion mechanism is provided for moving the pair of Halbach
arrays along
the track. When the pair of Halbach arrays moves along the
track
and the track is not located at the first plane, a current
is induced in the windings and a restoring force is exerted
on the
pair of
Halbach arrays.
Randall L. Simpson, Ronald S. Lee, Thomas M.
Tillotson, Lawrence W. Hrubesh, Rosalind W.
Swansiger,
Glenn A. Fox
Sol-Gel Manufactured Energetic Materials
U.S. Patent 6,666,935 B1
December 23, 2003
Sol-gel chemistry is used to prepare energetic materials (explosives,
propellants, and pyrotechnics) with improved homogeneity,
materials that can be cast to near-net shape, and/or those that
can be
made into precision molding powders. The sol-gel method is
a synthetic
chemical process wherein reactive monomers are mixed into
a solution and polymerization occurs, leading to a highly cross-linked,
three-dimensional solid network resulting in a gel. The energetic
materials can be
incorporated during the formation of the solution or during
the
gel stage. The composition, pore and primary particle sizes,
gel time, surface areas, and density may be tailored and
controlled
by the solution chemistry. The gel is then dried using supercritical
extraction to produce a highly porous, low-density aerogel
or by
controlled slow evaporation to produce a xerogel. Applying
stress during the extraction phase can result in high-density
materials.
Thus, the sol-gel method can be used to manufacture precision
detonator explosives and to produce precision explosives,
propellants, and
pyrotechnics as well as high-power composite energetic materials.
Awards |