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Andrew Clark
Andrew Clark, Henderson, NV US
| Patent application number | Description | Published |
|---|---|---|
| 20110099921 | SYSTEM AND METHOD FOR BOOTH ASSEMBLY - A modular display booth system is disclosed. The booth comprises walls, inserts, and toolless fasteners. The system is configured for efficient assembly and disassembly. The modular display booth system may be stored entirely on a single dolly for ease of transportation, coordination, and in warehouse alterations. | 05-05-2011 |
Andrew Clark, Bellevue, WA US
| Patent application number | Description | Published |
|---|---|---|
| 20100161999 | Scalable RFID systems: a privacy preserving protocol with constant-time identification - A protocol with constant-time complexity solves the problem of private identification of tags in low-cost, large-scale radio frequency identification (RFID) systems—assuming that an adversary has complete control over the communication channel. Each RFID tag has an internal counter, c, and is preloaded with a unique pseudonym, ψ, and a secret key, k. A RFID reader attempting to identify and authenticate a tag within its range generates and transmits a random nonce to the RFID tag, which returns a first hash of its current pseudonym and counter, and a second hash that is a function of the secret key. The reader uses the returned data to identify the RFID tag and its secret key by reference to a database and returns other hash values that authenticate the reader to the RFID tag. The most expensive operation that RFID tags are required to perform is a hash function. | 06-24-2010 |
Andrew Clark, Palo Alto, CA US
| Patent application number | Description | Published |
|---|---|---|
| 20100109047 | Multijunction rare earth solar cell - Examples of device structures utilizing layers of rare earth oxides to perform the tasks of strain engineering in transitioning between semiconductor layers of different composition and/or lattice orientation and size are given. A structure comprising a plurality of semiconductor layers separated by transition layer(s) comprising two or more rare earth compounds operable as a sink for structural defects is disclosed. | 05-06-2010 |
| 20100116315 | Active rare earth tandem solar cell - The use of rare-earth (RE and O, N, P) based materials to transition between two different semiconductor materials and enable up and/or down conversion of incident radiation is disclosed. Rare earth based oxides, nitrides and phosphides provide a wide range of lattice spacing enabling, compressive, tensile or stress-free lattice matching with Group IV, III-V, and Group II-VI compounds. | 05-13-2010 |
| 20100122720 | Passive Rare Earth Tandem Solar Cell - The use of rare-earth (RE+O, N, P) based materials to transition between two semiconductor materials is disclosed. Rare earth based oxides, nitrides and phosphides provide a wide range of lattice spacings enabling, compressive, tensile or stress-free lattice matching with Group IV, III-V, and Group II-VI compounds. Disclosed embodiments include tandem solar cells. | 05-20-2010 |
| 20110278464 | RADIATION DETECTOR AND FABRICATION PROCESS - A monolithic integrated radiation detector includes a photodetector and a scintillator deposited directly on the photodetector. Preferably the photodetector is silicon and the scintillator is a rare earth phosphor. The rare earth phosphor is crystal lattice matched to the silicon by a transitional layer epitaxially grown therebetween. | 11-17-2011 |
| 20110290313 | SOLAR CELLS WITH ENGINEERED SPECTRAL CONVERSION - A solar cell with engineered spectral conversion elements or components includes a single crystal silicon solar cell having a back surface. At least one spectral conversion element is formed on the back surface. The conversion element includes single crystal rare earth oxide, and the single crystal rare earth oxide is crystal lattice matched to the back surface of the silicon solar cell. Material including silicon is formed on the back surface in a surrounding and embedding relationship to the at least one spectral conversion element. A back reflector is positioned on the material formed on the back surface so as to reflect light passing through the silicon formed on the back surface. | 12-01-2011 |
| 20120019902 | INTERGRATED PUMP LASER AND RARE EARTH WAVEGUIDE AMPLIFIER - A light amplifier includes a single crystal semiconductor substrate with a rare earth oxide, light amplifying gain medium deposited on the substrate and formed into a light waveguide, and a pump laser. A lattice matching virtual substrate integrates the pump laser to the gain medium with a first opposed surface crystal lattice matched to the gain medium and second opposed surface crystal lattice matched to the pump laser. The pump laser is positioned with a light output surface coupled to a light input surface of the gain medium so as to introduce pump energy into the light waveguide. The light amplifier has a very small footprint and allows the integration of control and monitoring electronics. | 01-26-2012 |
| 20120073648 | Photovoltaic conversion using rare earths plus Group IV Sensitizers - The invention relates to photovoltaic device structures of more than one layer comprising rare earth compounds and Group IV materials enabling spectral harvesting outside the conventional absorption limits for silicon. | 03-29-2012 |
| 20120085399 | REO-Ge Multi-Junction Solar Cell - The invention relates to a semiconductor based structure for a device for converting radiation to electrical energy comprising various combinations of rare-earths and Group IV, III-V, and II-VI semiconductors and alloys thereof enabling enhanced performance including high radiation conversion efficiency. | 04-12-2012 |
| 20120090672 | REO-Ge Multi-Junction Solar Cell - The invention relates to a semiconductor based structure for a device for converting radiation to electrical energy comprising various combinations of rare-earths and Group IV, III-V, and II-VI semiconductors and alloys thereof enabling enhanced performance including high radiation conversion efficiency. | 04-19-2012 |
Andrew Clark, Los Altos, CA US
| Patent application number | Description | Published |
|---|---|---|
| 20100038521 | Photovoltaic up conversion and down conversion using rare earths - The use of rare-earth (REO, N, P) based materials to covert long wavelength photons to shorter wavelength photons that can be absorbed in a photovoltaic device (up-conversion) and (REO, N, P) materials which can absorb a short wavelength photon and re-emit one (downshifting) or more longer wavelength photons is disclosed. The wide spectral range of sunlight overlaps with a multitude of energy transitions in rare-earth materials, thus offering multiple up-conversion pathways. The refractive index contrast of rare-earth materials with silicon enables a DBR with >90% peak reflectivity and a stop band greater than 150 nm. | 02-18-2010 |
| 20100038541 | Monolithicallly integrated IR imaging using rare-earth up conversion materials - Infrared imaging at wavelengths longer than the silicon bandgap energy (>1100 nm) typically require expensive focal plane arrays fabricated from compound semiconductors (InSb or HgCdTe) or use of slower silicon microbolometer technology. Furthermore, these technologies are available in relatively small array sizes, whereas silicon focal plane arrays are easily available with 10 megapixels or more array size. A new technique is disclosed to up convert infrared light to wavelengths detectable by silicon focal plane arrays, or other detector technologies, thereby enabling a low-cost, high pixel count infrared imaging system. | 02-18-2010 |
| 20120104443 | IIIOxNy ON SINGLE CRYSTAL SOI SUBSTRATE AND III n GROWTH PLATFORM - A silicon-on-insulator (SOI) substrate structure and method of fabrication including a single crystal silicon substrate, a layer of single crystal rare earth oxide formed on the substrate, a layer of engineered single crystal silicon formed on the layer of single crystal rare earth oxide, and a single crystal insulator layer of IIIO | 05-03-2012 |
| 20120104567 | IIIOxNy ON REO/Si - An insulative layer on a semiconductor substrate and a method of fabricating the structure includes the steps of depositing a single crystal layer of rare earth oxide on a semiconductor substrate to provide electrical insulation and thermal management. The rare earth oxide is crystal lattice matched to the substrate. A layer of single crystal IIIO | 05-03-2012 |
Andrew Clark, Vernon Hills, IL US
| Patent application number | Description | Published |
|---|---|---|
| 20080219605 | Bearing Arrangement for Heavy Duty Marine Transmission - A bearing arrangement to reduce the effects of thermal expansion in a marine transmission includes a pinion gear thrust bearing, a clutch shaft thrust bearing, a shaft roller bearing and a thrust washer. The clutch shaft thrust bearing is retained on one end of a clutch shaft and the shaft roller bearing is retained on the other end of the clutch shaft. A pinion gear is rotatably retained on the clutch shaft. The pinion gear thrust bearing is retained on the pinion gear with a bearing retainer. The thrust washer is retained on the bearing retainer. An end of the clutch shaft thrust bearing rotates relative to the thrust washer and makes contact therewith. The length of thermal expansion in the transmission housing is limited to the distance between the opposing ends of the two thrust bearings. | 09-11-2008 |
| 20100040320 | BEARING ARRANGEMENT FOR HEAVY DUTY TRANSMISSION - A bearing arrangement is provided that reduces effects of differences in rates of thermal expansion between transmission housings and shaft assemblies that are made from different materials. The bearing arrangement locates the bearings with respect to other components of a shaft assembly in a manner that establishes a bearing setting stack path along components that are made from materials having common coefficients of thermal expansion, despite the shaft assembly and bearing arrangements being mounted within a housing that is made from a material which has a dissimilar coefficient of thermal expansion. | 02-18-2010 |
Andrew Clark, Half Moon Bay, CA US
| Patent application number | Description | Published |
|---|---|---|
| 20090285905 | SYSTEMS AND PROCESSES FOR SPRAY DRYING HYDROPHOBIC DRUGS WITH HYDROPHILIC EXCIPIENTS - Methods for preparing dry powders having hydrophobic and hydrophilic components comprise combining solutions of the components and spray drying them simultaneously in a spray dryer. The hydrophilic and hydrophobic component are separately dissolved in separate solvents and directed simultaneously through a nozzle, usually a coaxial nozzle, into the spray dryer. The method provides dry powders having relatively uniform characteristics. | 11-19-2009 |
Andrew Clark, Niwest, CO US
| Patent application number | Description | Published |
|---|---|---|
| 20090018966 | Formulation of Optimized Investment Indeces - Investment performance indices and methods of their formulation are described. The indices are determined by selecting a representative subset of assets (e.g., exchange-traded index funds) from a relatively larger number of possibilities in a given asset class. A performance index for the asset class is created by determining optimized weightings in each asset in the subset. The weightings can be optimized according to any number of optimization algorithms, including MVO, CVaR, and G-CAPM and tailored to a given investor risk profile. One or more “investor-centered” indices may be generated in this manner, for the asset class. | 01-15-2009 |
Andrew Clark US
| Patent application number | Description | Published |
|---|---|---|
| 20110203666 | HIGH EFFICIENCY SOLAR CELL USING IIIB MATERIAL TRANSITION LAYERS - A solar cell including a base of single crystal silicon with a cubic crystal structure and a single crystal layer of a second material with a higher bandgap than the bandgap of silicon. First and second single crystal transition layers are positioned in overlying relationship with the layers graduated from a cubic crystal structure at one surface to a hexagonal crystal structure at an opposed surface. The first and second transition layers are positioned between the base and the layer of second material with the one surface lattice matched to the base and the opposed surface lattice matched to the layer of second material. | 08-25-2011 |
Andrew Clark, Niwot, CO US
| Patent application number | Description | Published |
|---|---|---|
| 20120078814 | SYSTEM AND METHOD FOR FORECASTING REALIZED VOLATILITY VIA WAVELETS AND NON-LINEAR DYNAMICS - The system and method described herein may be used to forecast realized volatility via wavelets and non-linear dynamics. In particular, a volatility time series that includes daily volatility values associated with a security may be decomposed into wavelets via multi-resolution analysis and dynamical properties associated with the individual wavelets may be analyzed to identify deterministic and non-deterministic wavelets and produce a volatility forecast derived from a fit computed on the deterministic wavelets. For example, the wavelets may be analyzed to discover time delay, Theiler, and embedding dimension values associated therewith, which may be used to project volatility values associated with each wavelet. The projected volatility values associated with each wavelet may then be summed to produce a volatility forecast associated with the security. | 03-29-2012 |
Andrew Clark, Queensland AU
| Patent application number | Description | Published |
|---|---|---|
| 20120130724 | Detecting Anomalous User Activity - Systems, methods and articles for determining anomalous user activity are disclosed. Data representing a transaction activity corresponding to a plurality of user transactions can be received and user transactions can be grouped according to types of user transactions. The transaction activity can be determined to be anomalous in relation to the grouped user transactions based on a predetermined parameter. | 05-24-2012 |