Patents by Inventor Toshifumi Takahashi

Toshifumi Takahashi 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).

  • Publication number: 20080217704
    Abstract: In a semiconductor device including multiple unit cells arranged in an array, transistors are affected by a stress from an STI at different degrees depending on the position in the array. As a result, a variation occurs in transistor characteristic. In a semiconductor device according to the present invention, each of predetermined transistors in outermost unit blocks in the array has a transistor size according to the stress from the STI.
    Type: Application
    Filed: February 15, 2008
    Publication date: September 11, 2008
    Applicant: NEC ELECTRONICS CORPORATION
    Inventor: Toshifumi Takahashi
  • Publication number: 20080040448
    Abstract: To transfer web contents to a web server from a computer through a network, a plurality of files composing the web contents are stored in the computer. A processor of the computer then detects files to be transferred from the plurality of files to create a transfer file list table. A transfer priority of the files to be transferred is determined by the processor on the basis of reference relation data of the files to be transferred which are designated in the transfer file list table and file format data of the plurality of files to create a transfer priority list table for the files to be transferred. The files to be transferred are transferred to the web server from a communication controller of the computer through the network by the processor in order of the transfer priority set in the transfer priority list table.
    Type: Application
    Filed: August 2, 2007
    Publication date: February 14, 2008
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Shigeo Azuma, Takashi Takahashi, Toshifumi Takahashi
  • Publication number: 20070267761
    Abstract: A semiconductor device according to an embodiment of the present invention includes: a first region having patterns formed based on grid points as intersections of grid lines; and a second region including a plurality of layout cells an outer edge of which is defined by the grid points, the layout cells having patterns formed based on a wiring rule with patterns connected to patterns of the first region among the patterns being formed based on the grid points at a boundary with the first region.
    Type: Application
    Filed: May 16, 2007
    Publication date: November 22, 2007
    Applicant: NEC ELECTRONICS CORPORATION
    Inventor: Toshifumi Takahashi
  • Patent number: 7250661
    Abstract: A semiconductor memory device includes first and second source/drain regions, and first and second semiconductor regions. The first source/drain region of a first conductive type is formed in a first well region of a second conductive type for a pair of first MIS-type transistors of the first conductive type. The second source/drain region of the second conductive type is formed in a second well region of the first conductive type for a pair of second MIS-type transistors of the second conductive type. The first semiconductor region of the second conductive type is formed in the first source/drain region. The second semiconductor region of the first conductive type is formed in the second source/drain region.
    Type: Grant
    Filed: November 26, 2004
    Date of Patent: July 31, 2007
    Assignee: NEC Electronics Corporation
    Inventors: Toshifumi Takahashi, Hidetaka Natsume
  • Patent number: 7126835
    Abstract: A memory cell has a first switching element, a second switching element and a storage capacitor and formed in an active region. A first bit line and a first word line are connected to the first switching element and a second bit line and a second word line are connected to the second switching element. A plurality of the memory cells are formed within the active region which extends in a straight line. The active region extends at an angle with respect to the bit and word lines. The active region thus has no bent portions. The deterioration of the characteristics of the memory cell caused by the bent portions can be prevented.
    Type: Grant
    Filed: March 12, 2004
    Date of Patent: October 24, 2006
    Assignee: NEC Electronics Corporation
    Inventors: Hiroyuki Takahashi, Toshifumi Takahashi
  • Publication number: 20060215441
    Abstract: A semiconductor integrated circuit includes a word line extending along a first direction, a first and a second N-well regions, a P-well region disposed between the first and the second N-well regions, a memory cell having a first, second, third, and fourth PMOS transistors, and a first and second NMOS transistors, the first and the second PMOS transistors disposed in the first N-well region along a second direction which is different from the first direction, the first and the second NMOS transistors disposed in the P-well region, and the third and the fourth PMOS transistors disposed in the second N-well region along the second direction.
    Type: Application
    Filed: March 23, 2006
    Publication date: September 28, 2006
    Applicant: NEC ELECTRONICS CORPORATION
    Inventors: Muneaki Matsushige, Hiroyuki Satake, Hiroshi Furuta, Toshifumi Takahashi, Hideyuki Nakamura
  • Patent number: 6942361
    Abstract: A white LED lighting device and a light source for white LED lighting that enable an energy-saving, maintenance-free operation while ensuring ample illuminance. Structure of a light source for white LED lighting, constituted by: inserting and holding a plurality of white LED elements in holding holes in a reflective plate, said plate being constituted by providing a required number of said holding holes, in a matrix-like array of prescribed pitch, in a plate of shape corresponding to the illuminating surface of a lamp body; fixing said plurality of white LED elements at locations 2 to 4 mm behind their respective electrode portions; attaching the positive and negative terminals of the white LED elements to a base plate for the LED elements, said base plate being disposed parallel to and directly behind the reflective plate; and forming, at the positive and negative terminals, a series-parallel electrical network suitable for the applied voltage.
    Type: Grant
    Filed: August 22, 2003
    Date of Patent: September 13, 2005
    Inventors: Toshiji Kishimura, Harumi Kishimura, Yasuhisa Matsuno, Satoshi Abe, Toshifumi Takahashi, Toshiyuki Tsunashima, Masakatsu Osawa, Noboru Hotta
  • Publication number: 20050116303
    Abstract: A semiconductor memory device includes first and second source/drain regions, and first and second semiconductor regions. The first source/drain region of a first conductive type is formed in a first well region of a second conductive type for a pair of first MIS-type transistors of the first conductive type. The second source/drain region of the second conductive type is formed in a second well region of the first conductive type for a pair of second MIS-type transistors of the second conductive type. The first semiconductor region of the second conductive type is formed in the first source/drain region. The second semiconductor region of the first conductive type is formed in the second source/drain region.
    Type: Application
    Filed: November 26, 2004
    Publication date: June 2, 2005
    Applicant: NEC ELECTRONICS CORPORATION
    Inventors: Toshifumi Takahashi, Hidetaka Natsume
  • Publication number: 20040184298
    Abstract: A memory cell has a first switching element, a second switching element and a storage capacitor and formed in an active region. A first bit line and a first word line are connected to the first switching element and a second bit line and a second word line are connected to the second switching element. A plurality of the memory cells are formed within the active region which extends in a straight line. The active region extends at an angle with respect to the bit and word lines. The active region thus has no bent portions. The deterioration of the characteristics of the memory cell caused by the bent portions can be prevented.
    Type: Application
    Filed: March 12, 2004
    Publication date: September 23, 2004
    Inventors: Hiroyuki Takahashi, Toshifumi Takahashi
  • Patent number: 6566216
    Abstract: To provide a semiconductor device and a process for manufacturing the same which is capable of suppressing short channel effect and preventing a current from leaking between a contact and a silicon substrate. The semiconductor device of the present invention comprises a silicon substrate on which a source/drain area (3 in FIG. 1), a silicon oxide layer (4 in FIG. 1) and a silicon nitride layer (5 in FIG. 1) are successively formed in this order, and a trench which extend through said layers to split the source/drain area. A columnar gate electrode (9 in FIG. 1) is formed within the trench in such a manner that it is spaced from the inner wall of the trench and a lightly doped drain (LDD) area (10 in FIG. 1) is formed at an area of the bottom of the trench in which no gate electrode is disposed. In such a structure, the short channel effect which occurs in association with reduction in the gate length is suppressed.
    Type: Grant
    Filed: December 17, 1999
    Date of Patent: May 20, 2003
    Assignee: NEC Corporation
    Inventor: Toshifumi Takahashi
  • Patent number: 6555445
    Abstract: In order to suppress generation of waste matter which results from removing a backside film formed by growing a film on both surfaces of a semiconductor substrate and thereby attain satisfactorily high yield and productivity, on a semiconductor substrate 301, a polycrystalline silicon film 303 is formed through double-sided growth, and only on the obverse surface of the semiconductor substrate 301 a silicide film 304 is formed thereon, and then those polycrystalline silicon film 303 and silicide film 304 are worked into shape to form gate electrodes 303a. After that, on the semiconductor substrate 301, an insulating film for sidewall formation is formed to cover the gate electrodes 303a through double-sided growth, and the insulating film for sidewall formation formed on the obverse surface of the semiconductor substrate 301 is etched to form sidewall films.
    Type: Grant
    Filed: April 12, 2002
    Date of Patent: April 29, 2003
    Assignee: NEC Corporation
    Inventors: Tetsuya Hayashi, Toshifumi Takahashi
  • Publication number: 20020160594
    Abstract: In order to suppress generation of waste matter which results from removing a backside film formed by growing a film on both surfaces of a semiconductor substrate and thereby attain satisfactorily high yield and productivity, on a semiconductor substrate 301, a polycrystalline silicon film 303 is formed through double-sided growth, and only on the obverse surface of the semiconductor substrate 301 a silicide film 304 is formed thereon, and then those polycrystalline silicon film 303 and silicide film 304 are worked into shape to form gate electrodes 303a. After that, on the semiconductor substrate 301, an insulating film for sidewall formation is formed to cover the gate electrodes 303a through double-sided growth, and the insulating film for sidewall formation formed on the obverse surface of the semiconductor substrate 301 is etched to form sidewall films.
    Type: Application
    Filed: April 12, 2002
    Publication date: October 31, 2002
    Inventors: Tetsuya Hayashi, Toshifumi Takahashi
  • Patent number: 6387760
    Abstract: A semiconductor device comprising, on a semiconductor substrate, an element-isolating region, an active region, and a gate electrode with a bent portion having a bent-angle &thgr; on the active region. The boundary between the element-isolating region and the active region intersects the gate electrode so that the line segments of the boundary at which said intersection takes place, are approximately parallel to the bisector of the bent-angle &thgr; of the bent portion of the gate electrode. In this semiconductor device, the variation in width of gate electrode is small and accordingly the variation in properties is small, even when the relative position of gate electrode and active region of MOSFET has shifted slightly.
    Type: Grant
    Filed: April 10, 2001
    Date of Patent: May 14, 2002
    Assignee: NEC Corporation
    Inventors: Toshifumi Takahashi, Keita Kumamoto
  • Publication number: 20010020729
    Abstract: A semiconductor device comprising, on a semiconductor substrate, an element-isolating region, an active region, and a gate electrode with a bent portion having a bent-angle &thgr; on the active region. The boundary between the element-isolating region and the active region intersects the gate electrode so that the line segments of the boundary at which said intersection takes place, are approximately parallel to the bisector of the bent-angle &thgr; of the bent portion of the gate electrode. In this semiconductor device, the variation in width of gate electrode is small and accordingly the variation in properties is small, even when the relative position of gate electrode and active region of MOSFET has shifted slightly.
    Type: Application
    Filed: April 10, 2001
    Publication date: September 13, 2001
    Inventors: Toshifumi Takahashi, Keita Kumamoto
  • Publication number: 20010021567
    Abstract: The method of forming device isolation structures in semiconductor devices, according to the present invention, is comprised of a barrier layer formation step of forming predetermined isolation trenches on the primary surface of the semiconductor substrate, next oxidizing the surface of these isolation trenches so as to form an oxidized layer, and then depositing a oxidation stopping layer on top; an isolation trench filling step of depositing insulating material to the entire surface of the primary substrate surface so as to fill in the isolation trenches after the barrier layer formation step; and an annealing step of performing a wet oxidation process at a temperature higher than any of the processes after the isolation trench filling step forming the semiconductor device.
    Type: Application
    Filed: March 9, 2001
    Publication date: September 13, 2001
    Applicant: NEC CORPORATION.
    Inventor: Toshifumi Takahashi
  • Patent number: 6258708
    Abstract: There is provided a method of fabricating a semiconductor device, including the steps of forming a silicon oxide film on a semiconductor substrate for defining device isolation regions therewith, forming a gate oxide film over the product resulting from the previous step, forming an electrically conductive film over the product resulting from the previous step, forming a first insulating film over the electrically conductive film, etching the first insulating film and the electrically conductive film to thereby form a first wiring layer comprising a plurality of sections, forming a second insulating film around a sidewall of the sections of the first wiring layer, forming a first interlayer insulating film over the product resulting from the previous step, simultaneously forming a first contact hole reaching the semiconductor substrate and a second contact hole reaching the first wiring layer, forming a second wiring layer over the product resulting from the previous step, forming a second interlayer insulati
    Type: Grant
    Filed: March 16, 1998
    Date of Patent: July 10, 2001
    Assignee: NEC Corporation
    Inventor: Toshifumi Takahashi
  • Patent number: 6246080
    Abstract: A semiconductor device comprising, on a semiconductor substrate, an element-isolating region, an active region, and a gate electrode with a bent portion having a bent-angle &thgr; on the active region. The boundary between the element-isolating region and the active region intersects the gate electrode so that the line segments of the boundary at which said intersection takes place, are approximately parallel to the bisector of the bent-angle &thgr; of the bent portion of the gate electrode. In this semiconductor device, the variation in width of gate electrode is small and accordingly the variation in properties is small, even when the relative position of gate electrode and active region of MOSFET has shifted slightly.
    Type: Grant
    Filed: May 10, 1999
    Date of Patent: June 12, 2001
    Assignee: NEC Corporation
    Inventors: Toshifumi Takahashi, Keita Kumamoto
  • Patent number: 6118170
    Abstract: In a resistance element formed by a connection layer including a flexing portion, the connection layer is constructed by a high resistance section including the flexing portion and a low resistance section. Boundaries between the high resistance section and the low resistance section are approximately in parallel with a bisector of the connection layer at the flexing portion.
    Type: Grant
    Filed: January 12, 1999
    Date of Patent: September 12, 2000
    Assignee: NEC Corporation
    Inventors: Toshifumi Takahashi, Keita Kumamoto
  • Patent number: 5989951
    Abstract: In a method of manufacturing a semiconductor device, laminate structures with a first insulating film as a top film are formed on a semiconductor region having a first conductive type. One of the laminate structures is a gate electrode structure including a second insulating film as a gate insulating film formed on the semiconductor region, a conductive layer as a gate electrode formed on the gate insulating film, and the first insulating film formed on the gate electrode. Next, side wall insulating films are formed on side walls of the gate electrode structure and laminate structures adjacent to the gate electrode structure. Ion implantation of impurity of a second conductive type different from the first conductive type is executed using the side wall insulating films in a self-alignment manner to produce the source/drain regions for a metal-oxide-semiconductor (MOS) transistor.
    Type: Grant
    Filed: April 18, 1996
    Date of Patent: November 23, 1999
    Assignee: NEC Corporation
    Inventor: Toshifumi Takahashi
  • Patent number: 5909047
    Abstract: A semiconductor memory device capable of high-speed operation, low-voltage operation, and low power-consumption. First and second driver transistors are laid out in such a way that the channel regions of first and second driver transistors extend in a direction oblique to first and second word lines. First and second transfer transistors are laid out in such a way that the channel regions of the first and second transfer transistors extend in a direction perpendicular to the first and second word lines. The channel regions of the first and second transfer transistors and the contact resistance of the first and second bit contacts are substantially constant independent of an allowable overlay error, respectively, thereby keeping the capability of the first and second transfer transistors and the bit contact resistance the same independent of the allowable overlay error.
    Type: Grant
    Filed: May 30, 1997
    Date of Patent: June 1, 1999
    Assignee: NEC Corporation
    Inventor: Toshifumi Takahashi