Patents by Inventor C. Lai

C. Lai has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5606604
    Abstract: A system and method for preventing fraudulent calling activities of computer data systems such as a Private Branch Exchanges (PBX) accessed through dial-up telephone lines via a remote maintenance or administration port. The system is readily adaptable to existing PBX systems without the need to alter PBX hardware or software configurations. The system includes a device to passively monitor calling activity conducted through the remote port of the PBX without alerting the caller in order to detect a condition of activity indicative of fraud. The monitoring device may include rule based expert system software to analyze call transmission data for activities outside the norm that are indicative of fraud. Alternatively, the monitoring device may include software or hardware for comparing call digit origination data to a database of authorized call activity contained within the monitoring device.
    Type: Grant
    Filed: December 13, 1993
    Date of Patent: February 25, 1997
    Assignee: Lucent Technologies Inc.
    Inventors: Roberta S. Rosenblatt, Joseph C. Lai
  • Patent number: 5583507
    Abstract: A method and apparatus for passive identification includes a series of elements preferably in the form of strips, bars or other geometric shapes, or as dipole antennas made of a material having variable EM retro-reflectivity characteristics. By varying the characteristics of individual elements (i.e. spatial, polarization, frequency response and angular extent of retro-reflection), the elements form an alterable pattern which can be used for identification. The characteristics can be changed remotely, the ability of the device to understand and implement the change being a criterion for identification.
    Type: Grant
    Filed: April 19, 1995
    Date of Patent: December 10, 1996
    Assignee: Martin Marietta Corporation
    Inventors: Thomas C. D'Isepo, David C. Lai, Donald L. Stiver
  • Patent number: 5578637
    Abstract: Methods of inhibiting or killing cancer cells are disclosed wherein compounds having an endoperoxide moiety that is reactive with heme are administered under conditions which enhance intracellular iron concentrations. Representative endoperoxide compounds include endoperoxide bearing sesquiterpene compounds such as artemisinin and its analogs, arteflene and its analogs, 1,2,4-trioxanes and 1,2,4,5-tetraoxanes. Intracellular iron concentrations may be enhanced by the administration of iron salts or complexes.
    Type: Grant
    Filed: May 3, 1995
    Date of Patent: November 26, 1996
    Assignee: University of Washington
    Inventors: Henry C. Lai, Narendra P. Singh
  • Patent number: 5511152
    Abstract: A DRAM memory controller for a printer having a single host CPU and a bitmap memory. The CPU initiates data transfers synchronously to a system clock for filling the bitmap memory, and a DMA controller initiates data transfers asynchronously to the system clock for transferring data from the bitmap memory to a print engine. The controller includes a first sequencer for controlling synchronous data transfers initiated by the host CPU, a second sequencer for controlling asynchronous data transfers initiated by the DMA controller, a refresh request generator for generating a refresh request signal which is asynchronous to the system clock, and a third sequencer for controlling memory refresh and for controlling arbtitration betwween the first, second, and third sequencers. Also provided is a method of transferring data between a bitmap memory and a print fifo in a printer.
    Type: Grant
    Filed: September 20, 1993
    Date of Patent: April 23, 1996
    Assignee: Digital Equipment Corporation
    Inventors: Charles C. Lai, Wayne R. Bortman
  • Patent number: 5477451
    Abstract: The present invention is a system for translating text from a first source language into a second target language. The system assigns probabilities or scores to various target-language translations and then displays or makes otherwise available the highest scoring translations. The source text is first transduced into one or more intermediate structural representations. From these intermediate source structures a set of intermediate target-structure hypotheses is generated. These hypotheses are scored by two different models: a language model which assigns a probability or score to an intermediate target structure, and a translation model which assigns a probability or score to the event that an intermediate target structure is translated into an intermediate source structure. Scores from the translation model and language model are combined into a combined score for each intermediate target-structure hypothesis.
    Type: Grant
    Filed: July 25, 1991
    Date of Patent: December 19, 1995
    Assignee: International Business Machines Corp.
    Inventors: Peter F. Brown, John Cocke, Stephen A. Della Pietra, Vincent J. Della Pietra, Frederick Jelinek, Jennifer C. Lai, Robert L. Mercer
  • Patent number: 5412165
    Abstract: A switch assembly of the type having a rocker actuator user rotatable in opposite directions from a neutral position for alternate actuation of individual switches on opposite sides of the rocker each having a moveable actuator member movement of which by the rocker effects actuation of the switches. The rocker has a plurality of arcuately spaced recesses which are resiliently engaged to detent the rocker in a neutral and an actuated position. In one embodiment, the recesses engage a resilient wire beam spring extending parallel to the rocker axis. In another embodiment, the recesses are formed on a portion of the rocker which resiliently deflects to permit engagement and disengagement with a stationary pivot surface. In another embodiment, recesses in the rocker are engaged by a detent surface provided on a stationary resiliently deflectable beam extending at right angles to the rocker axis.
    Type: Grant
    Filed: November 19, 1993
    Date of Patent: May 2, 1995
    Assignee: Eaton Corporation
    Inventors: Peter G. Malone, Louis C. Lai
  • Patent number: 5259816
    Abstract: A ventilating apparatus which includes a housing divided by a rib into an inlet passage, an outlet passage, and a chamber. A controlling system having a motor, a drawing fan, and an exhaust fan. A filter net inserted in a slot between the air inlet of the housing and the drawing fan. A cover having a flange is fixedly mounted on the top of the housing and a louver provided with a plurality of air outlets and a plurality of air inlets is mounted on the bottom side of the housing.
    Type: Grant
    Filed: May 18, 1992
    Date of Patent: November 9, 1993
    Inventors: Po C. Ke, Kuo T. Lai, Pang T. Lu, Ching C. Lai, Chia C. Liu
  • Patent number: 5210047
    Abstract: A process for fabricating an electrically programmable read-only memory array having increased density includes forming recessed field oxide regions in a silicon substrate. Elongated parallel wordline stacks are then formed over the surface of the substrate. Source and drain regions are formed by ion implantation in the openings between these vertical stacks. These openings are then filled with a metal layer until the wafer is substantially planar. This metal layer is then patterned to form drain contact pads and V.sub.SS interconnect strips. The V.sub.SS interconnect strips contact adjacent source regions across field oxide regions that insulate adjacent memory cells.
    Type: Grant
    Filed: December 12, 1991
    Date of Patent: May 11, 1993
    Inventors: Been-Jon K. Woo, Gregory Atwood, Stefan K. C. Lai, T. C. Ong
  • Patent number: 5188980
    Abstract: A process for dry etching a multilayer tungsten silicide or other metal silicide polysilicon gate structure of an integrated circuit is achieved. A mixture of chlorine and helium gases is flowed into a vacuum chamber and a radio frequency is applied for etching the silicide layer. The chlorine gas flow is stopped after the etching of the tungsten silicide is completed and the vacuum chamber is purged with helium. The chlorine and helium gas flow is resumed to complete the etching of the polysilicon multilayer portion with a mixture of chlorine and helium gases. No undercutting of the tungsten silicide is experienced using this process.
    Type: Grant
    Filed: July 6, 1992
    Date of Patent: February 23, 1993
    Assignee: United Microelectronics Corporation
    Inventor: Ming C. Lai
  • Patent number: 5180894
    Abstract: A flexible, open ended microwave cooking tube formed of paper. The paper is provided with a layer of microwave susceptor material such as vacuum deposited metal. The tube is formed of a rectangular blank of the stock comprised of the paper and microwave susceptor material. A pair of opposite, parallel ends of the blank are seamed together and are provided with handle forming holes. In operation, a food item is placed within the tube. During the cooking process, the susceptor material reaches the high temperature required to brown and crispen the food. The seamed, handle portion of the tube, not being provided with susceptor material, remains relatively unheated and is hence less dangerous to the user when the tube and food are removed from the microwave oven. The tube can be formed from a continuous length of the paper/susceptor stock and wound into a roll. Short lengths of the tube can then be cut from the roll to provide individual containers for microwave cooking.
    Type: Grant
    Filed: June 19, 1990
    Date of Patent: January 19, 1993
    Assignee: International Paper Company
    Inventors: James R. Quick, James L. Alexander, Christopher C. Lai, Susan A. Matthews, Donna J. Wenzel
  • Patent number: 5177466
    Abstract: A lock structure with a warning device, in which an additional set of tumblers are installed on the four sides of the cylinder body, the plug member and the sliding sleeves; in case of a wrong key being inserted into the cylinder body, the tumblers will be touched and projected outwards to trigger off a warning device.
    Type: Grant
    Filed: August 5, 1991
    Date of Patent: January 5, 1993
    Inventor: Chung C. Lai
  • Patent number: 5166991
    Abstract: An optical switch biasing flow of light between a main optical waveguide and one or the other of a pair of secondary waveguides extending from one axial end of the main waveguide to define a Y structure with the secondary waveguides symmetrically positioned with respect to the longitudinal axis of the main waveguide is provided. A resonant conductor having a pair of legs each of which is operatively associated with the main waveguide and its respective adjacent one of the secondary waveguides generates a resonant voltage that directs the flow of light between the main waveguide and the secondary waveguide associated with the leg having an appropriate voltage.
    Type: Grant
    Filed: September 11, 1991
    Date of Patent: November 24, 1992
    Assignee: The University of British Columbia
    Inventors: Nicolas A. F. Jaeger, Winnie C. Lai, Mingche Chen
  • Patent number: 5095356
    Abstract: Integrated circuit formed from a semiconductor body having a rectangular grid pattern formed on the body. The grid pattern is defined by lines extending at right angles to each other along X and Y axes. A plurality of basic cells are provided which have a plurality of active elements therein. Each of the basic cells is selected from a limited number of basic cells of different designs. Each of the basic cells is disposed within a rectangular area no greater than a predetermined size and overlying a plurality of grid lines on both the X and Y axes so that each basic cell overlies a plurality of intersections of the grid lines which define predetermined grid points. Each basic cell includes a power bus, a ground bus, input leads and an output having a predetermined arrangement with respect to certain grid points. The power bus and ground bus and the input leads and output of each basic cell are connected to the basic cell.
    Type: Grant
    Filed: October 9, 1990
    Date of Patent: March 10, 1992
    Assignee: Fujitsu Limited
    Inventors: Hisashige Ando, Hung C. Lai, John J. Zasio
  • Patent number: 5078025
    Abstract: A direct transmission for a bicycle has a box disposed on a rear axle on which a conical gear is disposed. A shaft is coupled to the conical gear so as to drive the hub. A spring biases the shaft toward an annular flange in order that the shaft can not move longitudinally relative to the box. A hole with a notch is formed in a rear and outer end of the box. The rear axle can be inserted through the notch into the hole. A sleeve nut is engageable with the rear axle so as to stably retain the rear axle in position.
    Type: Grant
    Filed: October 29, 1990
    Date of Patent: January 7, 1992
    Inventors: Lee Wei, Ta C. Lai
  • Patent number: 4969029
    Abstract: Integrated circuit formed from a semiconductor body having a rectangular grid pattern formed on the body. The grid pattern is defined by lines extending at right angles to each other along X and Y axes. A plurality of basic cells are provided which have a plurality of active elements therein. Each of the basic cells is selected from a limited number of basic cells of different designs. Each of the basic cells is disposed within a rectangular area no greater than a predetermined size and overlying a plurality of grid lines on both the X and Y axes so that each basic cell overlies a plurlity of intersections of the grid lines which define predetermined grid points. Each basic cell includes a power bus, a ground bus, input leads and an output having a predetermined arrangement with respect to certain grid points. The power bus and ground bus and the input leads and output of each basic cell are connected to the basic cell.
    Type: Grant
    Filed: April 27, 1987
    Date of Patent: November 6, 1990
    Assignee: Fujitsu Limited
    Inventors: Hisashige Ando, Hung C. Lai, John J. Zasio
  • Patent number: 4957877
    Abstract: Improved processing which permits the simultaneous fabrication of block erasable flash EPROM cells and individually erasable EEPROM cells. A polysilicon finger extends from the floating gate of the EEPROM cell over a tunnel oxide region. Doped regions are formed under this finger by implanting dopants in alignment with the finger during the implantation of the source and drain regions for the cells and then driving the dopant under the finger. The arsenic dopant used to form the source and drain regions for the cells is used to form the doped regions along with the phosphorus dopant used for the source region of the flash EPROM cells.
    Type: Grant
    Filed: November 21, 1988
    Date of Patent: September 18, 1990
    Assignee: Intel Corporation
    Inventors: Simon M. Tam, Stefan K. C. Lai
  • Patent number: D337329
    Type: Grant
    Filed: January 15, 1991
    Date of Patent: July 13, 1993
    Inventor: Yi C. Lai
  • Patent number: D337331
    Type: Grant
    Filed: January 15, 1991
    Date of Patent: July 13, 1993
    Inventor: Yi C. Lai
  • Patent number: D373221
    Type: Grant
    Filed: May 10, 1995
    Date of Patent: August 27, 1996
    Inventor: Chin C. Lai
  • Patent number: D377830
    Type: Grant
    Filed: December 6, 1995
    Date of Patent: February 4, 1997
    Inventor: Wen C. Lai