Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 5204901 | Public key cryptographic mechanism A public key cryptographic mechanism provides a measurable degree of minimum security, in an ensemble sense, for two Parties, A and B, to establish a commonly held private cryptographic keying variable between them for establishing communications. Both pa... | 04/20/1993 |
| 5159220 | Realizations of folded magnet AC motors A rotor assembly for an internal permanent magnet rotor comprises a plurality of interior laminations stacked to form a substantially continuous internal core and a plurality of external laminations stacked to form a substantially continuous external core... | 10/27/1992 |
| 5157589 | Mutliple lamination high density interconnect process and structure employing thermoplastic adhesives having sequentially decreasing TG ' s A high density interconnect structure incorporating a plurality of laminated dieletric layers is fabricated using thermoplastic adhesive layers of progressively lower glass transition temperature in order to maintain the stability of the already fabricate... | 10/20/1992 |
| 5151776 | Die attachment method for use in high density interconnected assemblies A method for grounding or electrically biasing an integrated circuit chip without using a conductive die attach material comprises affixing the chips to a substrate using a thermoplastic polyimide adhesive. A metallization layer electrically connects the ... | 09/29/1992 |
| 5148166 | Third order sigma delta oversampled analog-to-digital converter network with low component sensitivity An improved modulator network for an interpolative oversampled (sigma-delta) analog-to-digital converter comprises a second-order modulator, which performs double integration of error between its digital output signal and its analog input signal, and a fi... | 09/15/1992 |
| 5146542 | Neural net using capacitive structures connecting output lines and differentially driven input line pairs Neural nets using capacitive structures are adapted for construction in complementary metal-oxide-semiconductor integrated-circuit technology. Fully differential input amplifiers in each neural net layer apply their push-pull responses to synapse input si... | 09/08/1992 |
| 5146303 | Compact, thermally efficient focal plane array and testing and repair thereof In a focal plane array sensor hybrid, a focal plane array fabricated in a chip of one semiconductor material and a read out circuit fabricated in one or more chips of a different semiconductor material are connected by a high density interconnect structur... | 09/08/1992 |
| 5144407 | Semiconductor chip protection layer and protected chip Semiconductor chips are protected from handling damage by formation of a polymer dielectric layer at least 2 microns thick on the chip surface before dicing or shortly after dicing. The polymer dielectric layer may be a thermoplastic material or a thermos... | 09/01/1992 |
| 5142649 | Ultrasonic imaging system with multiple, dynamically focused transmit beams A phased array sector scanning (PASS) ultrasonic imaging system produces a steered transmit beam with an array of transducer elements that are driven with separate carrier frequencies. A receiver forms the echo signal into a receive beam steered in the sa... | 08/25/1992 |
| 5142488 | Serial memories operated for re-ordering samples Serial memories are operated so as to reorder samples as they are serially supplied in a pipelined electronics system, such as one for performing matrix multiplications on a chain serial basis. A serial memory comprising (m-1) delay elements and a write m... | 08/25/1992 |
| 5142286 | Read-out photodiodes using sigma-delta oversampled analog-to-digital converters Sigma-delta analog-to-digital conversion is used in sensing apparatus that generates a digital signal descriptive of light energy received by a photosensor, such as one of a plurality of photosensors that together receive various elements of a radiant-ene... | 08/25/1992 |
| 5139972 | Batch assembly of high density hermetic packages for power semiconductor chips Batch assembly methods for high density packaging of power semiconductor chips in hermetic thin packagings includes providing silicon chip arrays with thermocompressively bonded foil contacts, preparing ceramic lid arrays which contain upper surface and l... | 08/18/1992 |
| 5138661 | Linear predictive codeword excited speech synthesizer A linear predictive codeword excited speech synthesizer performs a voiced/unvoiced decision to determine the type of excitation to be supplied to a synthesis filter. The synthesizer selects the excitation for voiced speech from a codebook, using an analys... | 08/11/1992 |
| 5135890 | Method of forming a hermetic package having a lead extending through an aperture in the package lid and packaged semiconductor chip A hermetically sealed package for a semiconductor device includes a lid through which the leads of the device extend vertically away from the chip through an aperture in the lid which is hermetically sealed by the external terminal or electrode. The packa... | 08/04/1992 |
| 5133795 | Method of making a silicon package for a power semiconductor device A method is provided for making a hermetically sealed package for a power semiconductor wafer having substantially entirely silicon materials selected to have coefficients of thermal expansion closely matching that of the power semiconductor wafer. A semi... | 07/28/1992 |
| 5134578 | Digital signal processor for selectively performing cordic, division or square-rooting procedures A bit-serial processor for selectively carrying out the sequential steps of performing by successive approximations Coordinate Rotation Digital Computation (CORDIC), non-restoring division or non-restoring square rooting calculations is suitable for inclu... | 07/28/1992 |
| 5127053 | Low-complexity method for improving the performance of autocorrelation-based pitch detectors A method of operating an autocorrelation pitch detector for use in a vocoder overcomes the pitch doubling and tripling problem using a heuristic rather than an analytic approach. The process tracks the times of occurrence of a highest and a second-highest... | 06/30/1992 |
| 5126961 | Plural-channel decimation filter, as for sigma-delta analog-to-digital converters A decimation filter in which two filtering processes are carried out on a time-division-multiplexed basis using kernels that are sampled-data representations of triangular waves, one of which waves decrements while the other increments, or vice versa. A d... | 06/30/1992 |
| 5124834 | Transferrable, self-supporting pellicle for elastomer light valve displays and method for making the same An elastomeric light valve has a substrate with a principal surface on which is formed a multiplicity of pixels; each pixel includes a first set of pixel electrodes interdigitated with a second set of pixel electrodes. A silicone elastomer gel is disposed... | 06/23/1992 |
| 5124656 | Adaptive estimation of phase or delay for both leading and lagging phase shifts Apparatus for measuring or compensating for phase or time delay between a reference signal and a desired signal produces an approximate error signal by differentially summing the desired and reference signals. The appoximate error signal is then used, in ... | 06/23/1992 |
| 5121364 | Time frequency control filter for an ultrasonic imaging system A phased array sector scanning ultrasonic imaging system produces digitized baseband samples of the received ultrasonic echo signals amplified by a time gain control (TGC) to compensate for dispersion losses in the media in which the ultrasonic signals pr... | 06/09/1992 |
| 5119153 | Small cell low contact resistance rugged power field effect devices and method of fabrication A multi-cellular power field effect semiconductor device has compact cells including a heavily doped portion of a body region which is self-aligned with respect to an aperture in the gate electrode. The intercept of this heavily doped portion of the body ... | 06/02/1992 |
| 5117553 | Method of assembling rotor magnets A rotor assembly for an internal permanent magnet rotor comprises a plurality of interior laminations stacked to form a substantially continuous internal core and a plurality of external laminations stacked to form a substantially continuous external core... | 06/02/1992 |
| 5119378 | Testing of integrated circuits including internal test circuitry and using token passing to select testing ports Built-in test circuitry, which is appropriate for monolithic integrated circuit chips that are to be connected in a plural-chip package, uses electronic token passing to select one of the test input ports in the circuitry to be tested for application of t... | 06/02/1992 |
| 5115492 | Digital correlators incorporating analog neural network structures operated on a bit-sliced basis Plural-bit digital input signals to be subjected to weighted summation are bit-sliced; and a number N of respective first through Nth weighted summations of the bits of the digital input signals in each bit slice are performed, resulting in a r... | 05/19/1992 |
| 5115437 | Internal test circuitry for integrated circuits using token passing to select testing ports Built-in test circuitry, which is appropriate for monolithic integrated circuit chips that are to be connected in a plural-chip package, uses electronic token passing to select one of the test input ports in the circuitry to be tested for application of t... | 05/19/1992 |
| 5111421 | System for performing addition and subtraction of signed magnitude floating point binary numbers A versatile floating point adder which performs high speed floating point addition or subtraction on operands supplied in a signed magnitude format includes separate exponent and mantissa data paths for processing the exponent fields and mantissa fields o... | 05/05/1992 |
| 5107586 | Method for interconnecting a stack of integrated circuits at a very high density Interconnected integrated cirucits (16) packaged at a very high density are fabricated beginning with a plurality of substrates (50 or 400 or 500) where each substrate has metal edge contact sites (12 or 507). Several substrates are joined together in a s... | 04/28/1992 |
| 5105536 | Method of packaging a semiconductor chip in a low inductance package A hermetic, high current package for a semiconductor device includes wide flat leads which are bonded to the contact pads of the device and formed to extend through apertures in an insulating lid. The lid is sealed to a base and the apertures around the l... | 04/21/1992 |
| 5105215 | Liquid crystal programmable photoresist exposure system Photoresist layers are rapidly exposed in a pattern determined by electronically stored data by exposure of the photoresist through a high resolution liquid crystal shutter array.... | 04/14/1992 |
| 5104480 | Direct patterning of metals over a thermally inefficient surface using a laser Conductive patterns may be formed on the surface of thermally inefficient substrates by depositing a uniform layer of metal thereover whose upper surface is substantially UV light absorbing followed by laser ablation of the deposited metal to leave the de... | 04/14/1992 |
| 5103290 | Hermetic package having a lead extending through an aperture in the package lid and packaged semiconductor chip A hermetically sealed package for a semiconductor device includes a lid through which the leads of the device extend vertically away from the chip through an aperture in the lid which is hermetically sealed by the external terminal or electrode. The packa... | 04/07/1992 |
| 5100740 | Direct bonded symmetric-metallic-laminate/substrate structures A composite structure comprising a symmetric bimetallic laminate bonded to a separate substrate is provided by eutectic bonding the bimetallic laminate to the substrate. A variety of beneficial structures can be provided.... | 03/31/1992 |
| 5099459 | Phased array ultrosonic transducer including different sized phezoelectric segments In a phased array acoustic transducer which has elements of different sizes, the piezoelectric material of large elements is subdiced to produce smaller segments to limit the overall piezoelectric segment size variation within the array to up to 55% or mo... | 03/24/1992 |
| 5094709 | Apparatus for packaging integrated circuit chips employing a polymer film overlay layer A method and apparatus are provided for disposing a polymer film on an irregularly-shaped substrate at relatively high temperatures. In particular, the method and apparatus of the present invention provide a system for the packaging of very large scale in... | 03/10/1992 |
| 5091893 | Ultrasonic array with a high density of electrical connections A piezoelectric ultrasonic array transducer has its individual elements connected to external electronics via a high density interconnect structure which facilitates signal connection and uniformity from array-to-array. The array fabrication process is pr... | 02/25/1992 |
| 5091817 | Autonomous active clamp circuit An autonomous active clamp circuit clamps voltage across an inductive load. The clamp closes when the voltage across it exceeds some value substantially above peak line voltage, conducts with a low voltage drop, and opens when the current going through it... | 02/25/1992 |
| 5086275 | Time domain filtering for NMR phased array imaging A method and apparatus for combining NMR response data of a sample from a plurality of closely spaced RF receiver coils of an NMR phased array in the time domain to form a composite NMR image wherein each of the RF receiver coils receives a different resp... | 02/04/1992 |
| 5084311 | Electromagnetic transducers and method of making them A technique for fabricating a patterned conductor on the inner surface of a transparent tube comprises providing a source of conductive material inside a hollow tube and directing actinic radiation onto the tube wall where the deposition of a conductive p... | 01/28/1992 |
| 5084639 | Low frequency noise canceling photodetector preamplifier useful for computerized tomography A preamplifier interfaces low level current-mode signals, such as from a photodetector in a computerized tomography system, to a corresponding voltage-mode signals, with a dynamic range on the order of 120 dB. The preamplifier can be implemented in CMOS t... | 01/28/1992 |
