Patents
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Michael C. Rushford
Optical Monitor for Real Time Thickness Change
Measurements Via Lateral-Translation Induced Phase-Stepping Interferometry
U.S. Patent 6,411,389 B1
June 25, 2002
An optical instrument for monitoring etch depth and etch rate to
control a wet-etching process. The instrument provides means for
viewing through the back side of a thick optic onto a nearly index-matched
interface. Optical baffling and the application of a photoresist
mask minimize spurious reflections, which allows monitoring with
extremely weak signals. A Wollaston prism enables linear translation
for phase stepping.
Robert J. Deri,
Anthony J. DeGroot, Ronald E. Haigh
High-Performance Parallel Processors Based on
Star-Coupled Wavelength Division Multiplexing Optical Interconnects
U.S. Patent 6,411,418 B1
June 25, 2002
As the performance of individual elements within parallel processing
systems increases, increased communication between distributed processor
and memory elements is required. There is great interest in using
fiber optics to improve interconnect communication beyond that attainable
with electronic technology. Several groups have considered wavelength-division-multiplexing,
star-coupled optical interconnects. The invention has a fiber-optic
transceiver to provide low-latency, high-bandwidth channels for
such interconnects using a robust, multimode fiber technology. Instruction-level
simulation quantifies the bandwidth, latency, and concurrency required
for such interconnects to scale to 256 nodes, each operating at
1-gigaops performance. Performance scales have been shown to approximate
100 gigaops for scientific application kernels using a small number
of wavelengths (8 to 32), only one wavelength received per node,
and achievable optoelectronic bandwidth and latency.
Kenneth L. Blaedel,
Pete J. Davis, Charles S. Landram
Method for Maintaining a Cutting Blade Centered
in a Kerf
U.S. Patent 6,412,377 B1
July 2, 2002
A saw having a self-pumped hydrodynamic blade guide or bearing for
retaining the saw blade in a centered position in the saw kerf (width
of cut made by the saw). The hydrodynamic blade guide or bearing
uses pockets or grooves incorporated into the sides of the blade.
The saw kerf in the workpiece provides the guide or bearing stator
surface. Both sides of the blade entrain cutting fluid as the blade
enters the kerf in the workpiece, and the trapped fluid provides
pressure between the blade and the workpiece as an inverse function
of the gap between the blade surface and the workpiece surface.
If the blade wanders from the center of the kerf, then one gap will
increase and one gap will decrease. The consequent pressure difference
between the two sides of the blade will cause the blade to recenter
itself in the kerf. Saws using the hydrodynamic blade guide or bearing
have particular application in slicing slabs from boules of single-crystal
materials, for example, as well as for cutting other difficult-to-saw
materials such as ceramics, glass, and brittle composite materials.
Muriel Y. Ishikawa,
Lowell L. Wood, E. Michael Campbell, Brent C. Stuart, Michael D.
Perry
Composition Analysis by Scanning Femtosecond Laser
Ultraprobing (CASFLU)
U.S. Patent 6,414,320 B1
July 2, 2002
The composition analysis by scanning femtosecond ultraprobing (CASFLU)
technology scans a focused train of extremely short-duration, very
intense laser pulses across a sample. The partially ionized plasma
ablated by each pulse is spectrometrically analyzed in real time
to determine the ablated materials composition. The steering
of the scanned beam can then be computer-directed to either continue
ablative material removal at the same site or to successively remove
nearby material for the same type of composition analysis. This
invention has utility in high-speed chemical-elemental, molecular-fragment,
and isotopic analyses of the microstructure composition of complex
objects, for example, the oxygen isotopic compositions of large
populations of single osteons in bone.
Anthony F. Bernhardt,
Vincent Malba
Three-Dimensional Coil Inductor
U.S. Patent 6,417,754 B1
July 9, 2002
A three-dimensional coil inductor, which includes a substrate, a
set of lower electrically conductive traces positioned on the substrate,
a core placed over the lower traces, a set of side electrically
conductive traces laid on the core and the lower traces, and a set
of upper electrically conductive traces attached to the side traces
so as to form the inductor. Fabrication of the inductor includes
the steps of forming a set of lower traces on a substrate, positioning
a core over the lower traces, forming a set of side traces on the
core, connecting the side traces to the lower traces, forming a
set of upper traces on the core, and connecting the upper traces
to the side traces so as to form a coil structure.
Duncan J. Maitland
Light Diffusing Fiber Optic Chamber
U.S. Patent 6,418,252 B1
July 9, 2002
A light-diffusion system for transmitting light to a target area.
The light is transmitted in a direction from a proximal end to a
distal end by an optical fiber. A diffusing chamber is operatively
connected to the optical fiber for transmitting the light from the
proximal end to the distal end and transmitting said light to said
target area. A plug is operatively connected to the diffusing chamber
for increasing the light that is transmitted to the target area.
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