Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 6686556 | Solid-waste energy plant using catalytic ionic-impact decomposition and combustion product regeneration A solid-waste conversion plant produces useful products and electrical energy in a closed system with zero emission of pollutants into the atmosphere. The plant is characterized by catalytic ionic-impact chambers having a pair of electrodes that establish... | 02/03/2004 |
| 6597077 | Stator coil T-connection for two-phase step motors A two-phase step motor with bifilar winding around the stator poles is connected to phases and ଲ (90° apart) of a two-phase driver in a manner that maximizes torque at medium speed operation and minimizes vibrations. In particular, the coil... | 07/22/2003 |
| 6510395 | Method of detecting residue on a polished wafer An apparatus for and method of determining the states on a wafer to be processed, e.g., whether residue in the form of metal is left on the surface of a wafer after chemical-mechanical polishing. The method comprises the steps of calculating first spectra... | 01/21/2003 |
| 6415022 | User programmable telephone wiring access terminal A telephone wiring terminal for use in an office building environment connects dedicated telephone lines and PBX or KEY telephone extensions to selected office jacks within an office building. The terminal comprises a customer programmable, electronic cro... | 07/02/2002 |
| 6393186 | Channel-switched cross-connect Tunable add-drop and cross connect devices include materials with negative refractive index dependence on temperature and temperature independent coincidence between modes of an athermal ring resonator and a set of specified frequencies, e.g. for DWDM tel... | 05/21/2002 |
| 6393185 | Differential waveguide pair An asymmetric waveguide pair (1440) with a differential thermal response has an optical coupling frequency that may be thermo-optically tuned. Tuning may also be accomplished by applying an electric field (1445) across a liquid crystal portion (1442) of t... | 05/21/2002 |
| 6373872 | Channel-switched tunable laser for DWDM communications Laser source including materials with negative index of refraction dependence on temperature and with temperature independent coincidence between cavity modes and a set of specified frequencies such as DWDM channels in telecommunications applications. The... | 04/16/2002 |
| 6331784 | Secure programmable logic device A programmable logic chip and configuration memory chip are mounted within a multi-chip module to form a single package. The configuration memory has a security bit which in a first state allows programming and read-back of configuration data in the memor... | 12/18/2001 |
| 6324204 | Channel-switched tunable laser for DWDM communications Laser source including materials with negative index of refraction dependence on temperature and with temperature independent coincidence between cavity modes and a set of specified frequencies such as DWDM channels in telecommunications applications. The... | 11/27/2001 |
| 6321011 | Channel-switched cross-connect Tunable add-drop and cross connect devices include materials with negative dependence of refractive index on temperature and temperature independent coincidence between resonator modes and a set of specified frequencies, e.g. for DWDM telecommunications c... | 11/20/2001 |
| 6292021 | FPGA structure having main, column and sector reset lines A field programmable gate array with a matrix of rows and columns of programmable logic cells interconnectable to each other by a network of local and express bus lines and to I/O pads at the perimeter of the logic cell matrix and bus network, is characte... | 09/18/2001 |
| 6219384 | Circuit for determining clock propagation delay in a transmission line A clock distribution apparatus with active phase alignment which makes the incidence of a timing event occur essentially simultaneously at multiple physically remote destinations. The circuit uses traces configured as reflective transmission lines with a ... | 04/17/2001 |
| 6180955 | Integrating optical collector with reduced re-illumination of phosphor sheet An integrating optical collector with a diffusely reflective interior surface and with at least one wavelength selective absorptive filter located therein in a position that nearly bisects the interior of the collector. The filters are highly transmissive... | 01/30/2001 |
| 6167559 | FPGA structure having main, column and sector clock lines A field programmable gate array with a matrix of rows and columns of programmable logic cells interconnectable to each other by a network of local and express bus lines and to I/O pads at the perimeter of the logic cell matrix and bus network, is characte... | 12/26/2000 |
| 6133576 | Broad spectrum ultraviolet inspection methods employing catadioptric imaging Broad spectrum ultraviolet inspection methods employ an achromatic catadioptric system to image the surface of an object, such as a semiconductor wafer or photomask, at multiple ultraviolet (UV) wavelengths over a large flat field (with a size on the orde... | 10/17/2000 |
| 6029187 | Fast regular multiplier architecture A multiplier architecture in accordance with the present invention provides increased operating speed, and yet maintains regularity in its structure in order to achieve a small floor plan when reduced to silicon. A Hekstra-type multiplier is modified by r... | 02/22/2000 |
| 6026227 | FPGA logic cell internal structure including pair of look-up tables A field programmable gate array has a matrix of programmable logic cells and a bus network of local and express bus lines. The bus network effectively partitions the matrix into blocks of cells with each block having its own distinct set of local bus line... | 02/15/2000 |
| 6016684 | Certification of an atomic-level step-height standard and instrument calibration with such standards An atomic-level step-height standard with step heights less than about 100 Å is in the form of a silicon wafer die with a generally smooth reflective surface but with a periodic pattern of alternating parallel flat linear mesas and valleys having a recta... | 01/25/2000 |
| 6014509 | Field programmable gate array having access to orthogonal and diagonal adjacent neighboring cells A field programmable gate array (FPGA) comprising a matrix of programmable logic cells, a bus network of local and express bus lines, and a system of perimeter I/O pads is disclosed. Logic cells are directly connected to neighboring nearest cells, includi... | 01/11/2000 |
| 5977805 | Frequency synthesis circuit tuned by digital words A direct digital frequency synthesizer featuring an accumulator having a modulo overflow signal addressing a multiplexer. The multiplexer receives a series of delay signals generated from digital circuits. The delay signals establish the phase of a refere... | 11/02/1999 |
| 5956174 | Broad spectrum ultraviolet catadioptric imaging system An ultraviolet (UV) catadioptric imaging system, with broad spectrum correction of primary and residual, longitudinal and lateral, chromatic aberrations for wavelengths extending into the deep UV (as short as about 0.16 μm), comprises a focusing lens gro... | 09/21/1999 |
| 5955654 | Calibration standard for microroughness measuring instruments A metrology standard that is useful for calibrating instruments for the levels of microroughness encountered in semiconductor, disk drive, and related industries today. In advanced applications, this level is about 5 Å rms in a 0.01-1.0 μm-1 ... | 09/21/1999 |
| 5931956 | Digital circuit using memory for monitoring signals for occurrences of predefined breakpoint conditions A breakpoint unit contains a memory circuit which monitors digital signals for the occurrence of any of a plurality of predetermined conditions. The memory circuit includes an array of memory cells (each cell storing data determining a value of a breakpoi... | 08/03/1999 |
| 5918302 | Digital sound-producing integrated circuit with virtual cache A digital sound-producing device having a digital signal processor (DSP) and data cache memory, and using an external sample memory for storing digital audio sample data, includes a virtual cache memory block for dynamically allocating cache lines of the ... | 06/29/1999 |
| 5894565 | Field programmable gate array with distributed RAM and increased cell utilization A field programmable gate array has a matrix of programmable logic cells and a bus network of local and express bus lines. The bus network effectively partitions the matrix into blocks of cells with each block having its own distinct set of local bus line... | 04/13/1999 |
| 5889593 | Optical system and method for angle-dependent reflection or transmission measurement An angle-dependent reflectometer or transmissometer includes an optical imaging array in the incident and reflected or transmitted light path that breaks up an incident light beam into mutually spatially incoherent light bundles. The individual light bund... | 03/30/1999 |
| 5864244 | Tristate buffer circuit with transparent latching capability A first output buffer circuit with independent transparent latch and tristate output capabilities includes input translators that directly drive a pair of main pull-up and pull-down output transistors. The input translators are tristatable in response to ... | 01/26/1999 |
| 5848026 | Integrated circuit with flag register for block selection of nonvolatile cells for bulk operations Bulk operation logic circuitry for use in carrying out bulk program, erase, verify and margining operations on nonvolatile memory cells of a PLD, FPGA, flash-based microcontroller, EEPROM, flash memory device or other integrated circuit containing such ce... | 12/08/1998 |
| 5732017 | Combined program and data nonvolatile memory with concurrent program-read/data write capability A nonvolatile memory device includes two floating-gate-type memory arrays, e.g. a flash memory intended to be used as a relatively permanent program memory and an E2 PROM intended to be used as a more frequently updated data memory. A single se... | 03/24/1998 |
| 5726583 | Programmable dynamic line-termination circuit A dynamic termination circuit is disclosed that has a plurality of parallel termination elements that respond successively to a signal transition and which are selectively enabled and disabled to provide a desired impedance match with a transmission line.... | 03/10/1998 |
| 5717518 | Broad spectrum ultraviolet catadioptric imaging system An ultraviolet (UV) catadioptric imaging system, with broad spectrum correction of primary and residual, longitudinal and lateral, chromatic aberrations for wavelengths extending into the deep UV (as short as about 0.16 μm), comprises a focusing lens gro... | 02/10/1998 |
| 5680346 | High-speed, non-volatile electrically programmable and erasable cell and method A non-volatile programmable circuit having programming and read bitlines, a non-volatile memory cell, and a read select transistor, and a method for its operation. The non-volatile memory cell is programmable through the programming bitline. The read sele... | 10/21/1997 |
| 5023486 | Logic output control circuit for a latch A logic output control circuit for selecting between stored and nonstored outputs from a data input and a clock having a data pass gate MOS transistor receiving a logic signal at its data input and either blocking the signal or passing it to a cross-coupl... | 06/11/1991 |
| 5023424 | Shock wave particle removal method and apparatus An apparatus and method using laser induced shock waves to dislodge particles from a wafer surface. The apparatus includes a wafer support, a particle detector and computer for locating and storing the locations of particles on the wafer, a laser, and foc... | 06/11/1991 |
| 4995050 | Diode laser with external lens cavity A diode laser external lens cavity configuration having a stripe mirror with two thin parallel stripes placed in front of the two lobes of the arrays for far field output pattern. The configuration includes a diode laser array or broad area laser, a lens ... | 02/19/1991 |
| 4984242 | GaAs/AlGaAs heterostructure laser containing indium GaAs/AlGaAs heterostructure lasers containing indium in at least one layer other than or in addition to the active region. Embodiments are described in which indium added in low concentration to the cladding functions to match the lattice constants betwee... | 01/08/1991 |
