Patents by Inventor Lu Chang

Lu Chang 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: 6052443
    Abstract: An interactive method for composing an alphanumeric message by a caller using a telephone keypad includes storing (215) a lexical database (135) from which unigram probabilities, forward conditional probabilities, and backward conditional probabilities for a plurality of words can be recovered; storing a received sequence of key codes (405) representing a sequence in which keys on a telephone style keypad are keyed; generating a word trellis including candidate words (415) derived from the sequence and the lexical database; determining a most likely phrase (420) from the candidate words, the unigram probabilities, forward conditional probabilities, and backward conditional probabilities; generating a most likely message (425) from the most likely phrase and presenting the most likely message to the caller; and confirming that the most likely message is the alphanumeric message (430).
    Type: Grant
    Filed: October 5, 1998
    Date of Patent: April 18, 2000
    Assignee: Motorola
    Inventors: Surendra Perera, Lu Chang, Jian-Cheng Huang, Robert J. Schwendeman
  • Patent number: 5974121
    Abstract: An interactive method for composing an alphanumeric message by a caller using a telephone keypad includes storing (215) a lexical database (135) from which unigram probabilities, forward conditional probabilities, and backward conditional probabilities for a plurality of words can be recovered; storing a received sequence of key codes (405) representing a sequence in which keys on a telephone style keypad are keyed; generating a word trellis including candidate words (415) derived from the sequence and the lexical database; determining a most likely phrase (420) from the candidate words, the unigram probabilities, forward conditional probabilities, and backward conditional probabilities; generating a most likely message (425) from the most likely phrase and presenting the most likely message to the caller; and confirming that the most likely message is the alphanumeric message (430).
    Type: Grant
    Filed: July 1, 1998
    Date of Patent: October 26, 1999
    Assignee: Motorola, Inc.
    Inventors: Surendra Perera, Lu Chang, Jian-Cheng Huang, Robert J. Schwendeman
  • Patent number: 5807667
    Abstract: The invention is generally accomplished by a method of sensitizing comprising providing tabular silver bromoiodide grains or bromoiodide grains doped with Se and Iridium bringing said grains into contact with a benzothiazolium salt or hydrolyzed benzothiazolium salt comprising ##STR1## wherein R.sub.1 is hydrogen, alkyl of from 1 to 8 carbon atoms, or aryl of from 6 to 10 carbon atoms,R.sub.4 and R.sub.5 are independently hydrogen or halogen atoms, aliphatic or aromatic hydrocarbon moieties optionally linked through a divalent oxygen or sulfur atom; or cyano, amino, amido, sulfonamido, sulfamoyl, ureido, thioureido, hydroxy, --C(O)M, or --S(0).sub.2 M groups, wherein M is chosen to complete an aldehyde, ketone, acid, ester, thioester, amide, or salt;Y.sub.1 is a charge balancing counter ion; andQ is a substituent of the formula:--LCONHS0.sub.2 R, --LCONHS0.sub.2 NHCOR alkyl, sulfoalkyl, phosphoalkyl, hydroxyalkyl, or L--CONH.sub.
    Type: Grant
    Filed: April 16, 1992
    Date of Patent: September 15, 1998
    Assignee: Eastman Kodak Company
    Inventor: Elizabeth Pui-lu Chang
  • Patent number: 5781644
    Abstract: A pick-up device includes a front cover, a diaphragm incorporating a voice coil disposed posteriorly of the front cover, a front flux shield plate disposed posteriorly of the diaphragm and having a first hole, a magnet disposed at a back side of the front flux shield plate and having a second hole aligned with the first hole, a yoke disposed around the front flux shield plate and the magnet and confining a first air passage with both the front flux shield plate and the magnet, a rear flux shield plate disposed at the back sides of the magnet and the yoke and having a threaded third hole which is aligned with the second hole, the rear flux shield plate further having a second air passage which is communicated with the first air passage, an encapsulation to encompass the yoke and the rear flux shield plate, a rear cap to encompass the encapsulation and the rear flux shield plate, a screw rod passing through the rear cap and threadedly engaged with the third hole, thereby closing the third hole, and a high frequ
    Type: Grant
    Filed: June 20, 1997
    Date of Patent: July 14, 1998
    Inventor: Ching-Lu Chang
  • Patent number: 5746600
    Abstract: A color reference chips system for plastics has a sheet having a plurality of sets of holes, each set being provided with two holes, a first side of each hole receiving a color chip made of dyed plastic film whereby shade difference between the color chips is perceptible when light is shone from a second side of said hole. A plurality of chips can be bound together and enclosed by a portfolio.
    Type: Grant
    Filed: February 25, 1997
    Date of Patent: May 5, 1998
    Inventor: Chin-lu Chang
  • Patent number: 5719996
    Abstract: A selective call communication system (100) has a speech recognition system using an acoustic space (400) which has a plurality of probability density functions (pdfs). The selective call communication system (100) has an acoustic space generator (136) for representing speech in the acoustic space (400) which has a plurality of regions (1-14) having a subset of the plurality of probability density functions (502-516). The selective call communication system (100) has a tree generator (138) for generating a hierarchical tree structure (500) representing the subset of the plurality of probability density functions (502-516) associated with the plurality of regions (1-14), a score computer (132) for determining a region of the plurality of regions (1-14) indicative of a minimum distance to a center of the region for a speech sample received, and a speech recognizer (130) for calculating the probability density functions of the region for recognizing the speech sample received.
    Type: Grant
    Filed: June 30, 1995
    Date of Patent: February 17, 1998
    Assignee: Motorola, Inc.
    Inventors: Lu Chang, Yan-Ming Cheng
  • Patent number: 5706359
    Abstract: A handheld microphone includes a housing, a pick-up device, and a shockmount member. The housing includes a hollow handle member, a coupling member fastened to the hollow handle member, and a perforated cap fastened to the coupling member. One end of the coupling member is formed with a recess with a base wall that has an opening. The pick-up device has a pick-up head extending into the cap, a tubular end portion extending into the coupling member, and an axial shank extending through the opening and fastened to the base wall.
    Type: Grant
    Filed: January 13, 1997
    Date of Patent: January 6, 1998
    Inventor: Ching-Lu Chang
  • Patent number: 5692019
    Abstract: A communication device (400) with a polarization diversity antenna configuration, having a first antenna (410) with a first plane of polarization and a second antenna (412) with a second plane of polarization. Signal strength of a demodulated signal when the antenna switch (420) is coupled to one of the antennas (410, 412) is measured by a signal strength measuring circuit (440) to generate a short-term average signal power (SA) representing signal strength over a first predetermined number of symbol periods, a medium-term average signal power (MA) representing signal strength over a second predetermined number of symbol periods, and a long-term average signal power (LA) representing signal strength over a third predetermined number of symbol periods, greater than the second predetermined number of symbol periods and first predetermined number of symbol periods. Switching between antennas (410, 412) is made in response to differences between SA, MA and LA.
    Type: Grant
    Filed: June 17, 1996
    Date of Patent: November 25, 1997
    Assignee: Motorola, Inc.
    Inventors: Chun-Ye Susan Chang, Jian-Cheng Huang, Lu Chang, Lorenzo Ponce De Leon, David Petreye, James Michael Keba, Clinton C. Powell, II
  • Patent number: 5683877
    Abstract: This invention relates to a method for identifying single base pair mismatches in nucleic acids using mismatch endonucleases and a set of labeled oligonucleotide probes which hybridize to mismatch sequences in the target nucleic acid such that a detectable enzyme-nucleic acid-probe complex forms or labeled cleaved fragments form when a base pair mismatch is present.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: November 4, 1997
    Assignee: The University of Maryland at Baltimore
    Inventors: A-Lien Lu-Chang, Ih-Chang Hsu
  • Patent number: 5673330
    Abstract: A microphone transducer includes a magnet, a yoke disposed around the magnet, an inner insulator provided between the magnet and the yoke, an outer insulator provided around the yoke, a voice coil provided around an upper portion of the magnet, and a diaphragm having a central convex portion and an annular convex portion which encircles the central convex portion. The central convex portion has a periphery which is attached to the voice coil. The annular convex portion has a periphery which is attached to the outer insulator. A noise reducing member includes a rigid annular mounting plate which is attached to the periphery of the annular convex portion of the diaphragm, and a flexible cushioning ring having a top side attached to the mounting plate and a bottom side attached to the outer insulator.
    Type: Grant
    Filed: November 8, 1995
    Date of Patent: September 30, 1997
    Inventor: Ching-Lu Chang
  • Patent number: 5592531
    Abstract: A selective call communication system (100), such as a paging system (100), and a method therefor, for using a lexicon (134) for voice data entry in the selective call communication system (100) is shown. The system (100) associates a Voice User ID (206) to a subscriber ID (202) for one or more subscribers of the system (100). The system (100) accumulates user system statistics (208). Then, based on the accumulated user system statistics (208), the system (100) defines a lexicon (134) to include at least one Voice User ID (206) for the one or more subscribers for voice data entry for the system (100).
    Type: Grant
    Filed: April 3, 1995
    Date of Patent: January 7, 1997
    Assignee: Motorola, Inc.
    Inventors: Yan M. Cheng, Lu Chang
  • Patent number: 5590211
    Abstract: A microphone includes a voice coil, a membrane and a diaphragm that has an annular convex portion encircling a central convex portion and a concentric cutout portion on the central convex portion. The membrane covers the cutout portion and extends to the periphery of the central convex portion. The combination of a properly designed cutout portion, the thickness of the membrane, the materials used for the membrane and the diaphragm, and the adhesive method employed to connect the membrane and the diaphragm shall result in a microphone that is capable of delivering high quality sound.
    Type: Grant
    Filed: July 14, 1995
    Date of Patent: December 31, 1996
    Inventor: Ching-Lu Chang
  • Patent number: 5254453
    Abstract: The invention is generally accomplished by a method of forming a silver halide emulsion in which digestion of nucleated silver halide grains is carried out in a halide solvent concentration of between about 0.0015 and about 0.015 normal. In a preferred embodiment the solvent utilized is ammonium hydroxide and grains of a thickness of between about 0.05 and 0.5 micron having an equivalent circular diameter of about 0.05 to about 2.0 microns are produced. It is also preferred that the grains be nucleated in a bromide solution having a bromide ion concentration of between 0.0075 and about 0.6 normal.
    Type: Grant
    Filed: April 16, 1992
    Date of Patent: October 19, 1993
    Assignee: Eastman Kodak Company
    Inventor: Elizabeth Pui-lu Chang