Patents
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Joe N. Lucas
Method for Isolating Chromosomal DNA in Preparation
for Hybridization in Suspension
U.S. Patent 6,077,671 June 20, 2000
A method is provided for detecting nucleic acid sequence aberrations
using two immobilization steps. A nucleic acid sequence aberration
is present when one acid sequence has both a first nucleic acid
sequence type (for example, from a first chromosome) and a second
nucleic acid sequence type (for example, from a second chromosome).
In the method, immobilization of a first hybridization probe is
used to isolate a first set of nucleic acids from a sample of the
first nucleic acid sequence type. Immobilization of a second hybridization
probe is then used to detect and isolate a second set of nucleic
acids from within the first set. The presence of the second set
of nucleic acids indicates the presence of a nucleic acid sequence
aberration. Chromosomal DNA in a sample containing cell debris is
prepared for hybridization in suspension by treating the mixture
with RNase. The treated DNA can also be fixed prior to hybridization.
Charles G. Stevens
and Norman L. Thomas
Immersion Echelle Spectrograph
U.S. Patent 6,078,048 June 20, 2000
A small spectrograph containing no moving components and capable
of providing high-resolution spectra of the mid-infrared region
from 2 to 4 micrometers in wavelength. The resolving power of the
spectrograph exceeds 20,000 throughout this region and at an optical
throughput of about 0.00005 square centimeters per steradian. The
spectrograph incorporates a silicon immersion echelle grating operating
in high spectral order combined with a first-order transmission
grating in a cross-dispersing configuration to provide a two-dimensional
spectral format that is focused onto a two-dimensional infrared
detector array. The spectrometer incorporates a common collimating
and condensing lens assembly in a nearly aberration-free axially
symmetric design. The spectrometer has potential uses in general
research as well as in areas such as monitoring atmospheric constituents
for air quality, climate change and global warming research, and
monitoring exhaust fumes for smog sources or exhaust plumes for
evidence of illicit drug manufacture.
Alan D. Conder
Vacuum-Compatible Miniature CCD Camera Head
U.S. Patent 6,078,359 June 20, 2000
A charge-coupled device (CCD) camera head that can replace film
for digital imaging of visible light, ultraviolet radiation, and
soft-to-penetrating x rays, such as within a target chamber where
laser-produced plasmas are studied. The camera head is small, is
capable of operating both in and out of a vacuum environment, and
is versatile. The CCD camera head uses PC boards with an internal
heat sink connected to the chassis for heat dissipation, allowing
for close (0.22 centimeters, for example) stacking of the PC boards.
Integration of this CCD camera head into existing instrumentation
provides a substantial enhancement of diagnostic capabilities for
studying high-energy-density plasmas in a variety of military, industrial,
and medical imaging applications.
Jesse D. Wolfe
and Norman L. Thomas
Durable Silver Coating for Mirrors
U.S. Patent 6,078,425 June 20, 2000
A durable multilayer mirror that includes reflective layers of aluminum
and silver and has high reflectance over a broad spectral range,
from ultraviolet to visible to infrared. An adhesion layer of a
nickel and/or chromium alloy or nitride is deposited on an aluminum
surface, and a thin layer of silver is then deposited on the adhesion
layer. The silver layer is protected by a passivation layer of a
nickel and/or chromium alloy or nitride and by one or more durability
layers made of metal oxides and typically a first layer of metal
nitride. The durability layers may include a composite silicon aluminum
nitride and an oxinitride transition layer to improve bonding between
nitride and oxide layers.
Joe N. Lucas
Method for Obtaining Chromosome Painting Probes
U.S. Patent 6,132,974 October 17, 2000
A method for determining a clastogenic signature of a sample of
chromosomes. The frequency of each of two types of chromosome aberration
present in the sample is quantified. Then the frequencies are compared
to each other. A method is also provided for using that clastogenic
signature to identify a clastogenic agent or dosage to which the
cells have been exposed.
Eberhard A.
Spiller, Paul B. Mirkarimi, Claude Montcalm, Sasa Bajt, and James
A. Folta
Method to Adjust Multilayer Film Stress-Induced
Deformation of Optics
U.S. Patent 6,134,049 October 17, 2000
Stress-compensating systems that reduce stress in a multilayer without
losing reflectivity and reduce total film thickness, compared to
the thicknesses produced by the earlier buffer-layer method. The
stress-free multilayer systems contain two different material combinations
of opposite stress, both giving good reflectivity at the design
wavelengths. The main advantage of this multilayer design is that
stress reduction does not require the deposition of additional layers,
as in the buffer-layer approach. If the optical performance of the
two systems at the design wavelength differ, the system with the
poorer performance is deposited first, and then the system with
better performance is added, forming the top of the multilayer system.
The components for the stress-reducing layer are chosen from among
materials that have stress opposite to that of the preferred multilayer
reflecting stack and simultaneously have optical constants that
allow good reflectivity at the design wavelength.
James E. Trebes,
Perry M. Bell, and Ronald B. Robinson
Miniature X-Ray Source
U.S. Patent 6,134,300 October 17, 2000
A miniature x-ray source using a hot filament cathode. The source
is sized on the millimeter scale and is capable of producing broad
spectrum x-ray emissions over a wide range of x-ray energies. The
miniature source consists of a compact vacuum tube assembly containing
the hot filament cathode, an anode, a high-voltage feedthrough for
delivering high voltage to the cathode, a getter for maintaining
high vacuum, a connector for initial vacuum pumpdown and crimpoff,
and a high-voltage connection for attaching a compact high-voltage
cable to the high-voltage feedthrough. At least a portion of the
vacuum tube wall is fabricated from materials highly transparent
to x rays, such as sapphire, diamond, or boron nitride.
Conrad M. Yu
and Jackson C. Koo
System and Method for Preconcentrating, Identifying,
and Quantifying Chemical and Biological Substrates
U.S. Patent 6,134,944 October 24, 2000
The system and method consist of an input valve that directs a volume
of sample gas to a surface acoustic wave (SAW) device where a mass
of a substance within it is preconcentrated and detected. Some of
this sample gas containing the preconcentrated substance is directed
through an output valve to a gas chromatograph (GC) where the preconcentrated
substance is then identified. A shunt valve exhausts a volume of
the sample gas equal to the volume directed to the SAW minus the
volume sent to the GC.
Anthony M. McCarthy,
Robert J. Contolini, Vladimir Liberman, and Jeffrey Morse
Submicron Patterned Metal Hole Etching
U.S Patent 6,139,716 October 31, 2000
A wet chemical process for etching submicrometer patterned holes
in thin metal layers using electrochemical etching helped by a wetting
agent. In this process, the wafer to be etched is immersed in a
wetting agent (such as methanol) for a few seconds before it is
inserted into an electrochemical etching setup. The wafer is kept
horizontal during transfer so that a film of methanol continuously
covers the patterned areas. The electrochemical etching setup includes
a tube that seals the edges of the wafer to prevent the loss of
methanol. An electrolyte composed of 4:1 water:sulfuric acid is
poured into the tube, and the electrolyte replaces the wetting agent
in the patterned holes. A working electrode is attached to a metal
layer of the wafer, with reference and counter electrodes inserted
in the electrolyte and all electrodes connected to a potentiostat.
A single pulse on the counter electrode, such as a 100-millisecond
pulse at +10.2 volts, is used to excite the electrochemical circuit
and perform the etch. The process etches uniform patterned holes
in the metal layers (such as chromium and molybdenum) of the wafer
without adversely affecting the patterned mask.
Joe N. Lucas
Method for Detecting a Pericentric Inversion in
a Chromosome
U.S. Patent 6,140,057 October 31, 2000
A method is provided for determining a clastogenic signature of
a sample of chromosomes by quantifying a frequency of a first type
of chromosome aberration present in the sample; quantifying a frequency
of a second, different type of chromosome aberration present in
the sample; and comparing the frequency of the first type of chromosome
aberration to the frequency of the second type of chromosome aberration.
A method is also provided for using that clastogenic signature to
identify a clastogenic agent or dosage to which the cells were exposed.
Roger D. Aines,
Robin L. Newmark, and Kevin G. Knauss
Thermal Treatment Wall
U.S. Patent 6,142,706 November 7, 2000
A thermal treatment wall emplaced to perform in situ destruction
of contaminants in groundwater. Thermal destruction of specific
contaminants occurs by hydrous pyrolysis-oxidation at temperatures
achievable by existing thermal remediation techniques (electrical
heating or steam injection) in the presence of oxygen or soil mineral
oxidants such as manganese oxide. The thermal treatment wall can
be installed in a variety of configurations, depending on the specific
objectives, and can be used to clean up groundwater contamination
in situ, rather than extracting contaminated fluids to the surface
for cleaning. In addition, the thermal treatment wall can be used
for both plume interdiction and near-wellhead in situ groundwater
treatment. Thus, this technique can be used for a variety of groundwater
contamination problems.
William M. Greenbaum
Active Alignment-Contact Verification System
U.S. Patent 6,143,989 November 7, 2000
A system involving an active (that is, electrical) technique for
the verification of (1) close-tolerance mechanical alignment between
two components, and (2) electrical contact between mating through
an elastomeric interface. For example, the two components may be
an alumina carrier and a printed circuit board, two mating parts
that are extremely small and high density and require alignment
within a fraction of a millimeter, as well as a specified interface
point of engagement between the parts. The system comprises pairs
of conductive structures defined in the surface layers of the alumina
carrier and the printed circuit board, for example. The first pair
of conductive structures relate to item (1) above and permit alignment
verification between mating parts. The second pair of conductive
structures relate to item (2) above and permit verification of electrical
contact between mating parts.
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