Patents by Inventor Masaaki Yoshida

Masaaki Yoshida 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: 7335557
    Abstract: A non-volatile memory semiconductor device includes a first insulation layer, two diffusion regions, a memory gate oxide layer, a first control gate, a second insulation layer, a floating gate of polysilicon, a third insulation layer and a second control gate. The first insulation layer is formed on a semiconductor substrate. The two diffusion regions are formed on a surface of the substrate. The memory gate oxide layer is formed over the two diffusion regions on the substrate. The first control gate including a diffusion region is formed on the surface of the substrate. The second insulation layer is formed on the first control gate. The floating gate of polysilicon is formed over the memory gate oxide layer, the first insulation layer, and the second insulation layer. The third insulation layer is formed on the floating gate. The second control gate is disposed on the floating gate.
    Type: Grant
    Filed: July 20, 2005
    Date of Patent: February 26, 2008
    Assignee: Ricoh Company, Ltd.
    Inventors: Masaaki Yoshida, Hiroaki Nakanishi
  • Publication number: 20080045617
    Abstract: A cross-linked polymer is recycled by decomposing a C—C bond by an oxidative decomposition reaction using a nitrogen oxide in a supercritical carbon dioxide. A reaction temperature, a pressure and a reaction time are controlled such that a nitrogen oxide is sorbed at a branch point of a C—C bond of the cross-linked polymer. As a result, the branch point of the C—C bond is preferentially oxidized to cleave the C—C bond.
    Type: Application
    Filed: August 2, 2007
    Publication date: February 21, 2008
    Applicant: HITACHI CABLE, LTD.
    Inventors: Toshiharu Goto, Tokanori Yamazaki, Masaaki Yoshida, Yasuhrio Funayama
  • Publication number: 20080032202
    Abstract: The liquid immersion lithography process is configured so that the resist pattern resolution is improved by exposing a resist film to the lithographic exposure light under the conditions in which the predetermined thickness of the liquid for liquid immersion lithography, of which the refractive index is higher than that of air and smaller than that of the resist film is intervened at least on the resist film in a path of the lithography exposure light reaching the resist film, a protective film is formed on the surface of the resist film to be used. Therefore, when various immersion liquid, water being the representative example is used in the liquid immersion lithography process can be formed, the deterioration of the resist film and the immersion liquid to be used are simultaneously prevented, and the number of the process steps are not increased, and then the resist pattern having higher resolving ability.
    Type: Application
    Filed: April 25, 2005
    Publication date: February 7, 2008
    Inventors: Keita Ishizuka, Kazumasa Wakiya, Kotaro Endo, Masaaki Yoshida
  • Patent number: 7326512
    Abstract: Provided are a polymer compound having high transparency for use in a photoresist composition for microfabrication of the next generation, a resist composition using the polymer compound as a base polymer, and a dissolution inhibitor agent composed of the polymer compound. To ensure etching resistance, an alicyclic group is introduced into a side chain portion. Hydrogen atoms on the ring of the alicyclic group are highly fluorinated to ensure transparency to light of 157 nanometer wavelength, represented by an adsorption coefficient equal to or less than 3.0 ?m?1. As the alicyclic group, a polycyclic group is preferably used. Hydrogen atoms are highly fluorinated by preferably substituting all hydrogen atoms on the ring by fluorine atoms, that is, forming a perfluoroalicyclic group. The resist composition is formed by using the polymer compound as a base polymer and further, the dissolution inhibitor agent is formed of the polymer compound.
    Type: Grant
    Filed: November 28, 2003
    Date of Patent: February 5, 2008
    Assignee: Tokyo Ohka Kogyo Co., Ltd.
    Inventors: Toshiyuki Ogata, Kotaro Endo, Hiromitsu Tsuji, Masaaki Yoshida, Hideo Hada, Ryoichi Takasu, Mitsuru Sato
  • Patent number: 7314797
    Abstract: A semiconductor device is capable of being applied with both a positive and a negative voltage to its control gate, and writing to its memory requires a low voltage. A control gate is formed on a memory unit region of a field oxide film, and an inter-layer silicon oxide film is formed on its surface. A gate oxide film for a non-volatile memory is formed on a P substrate between N type diffusion layers. The floating gate is formed on the inter-layer silicon oxide film, the field oxide film, and the gate oxide film for the non-volatile memory. Since a large coupling ratio between the control gate and the floating gate is available on the field oxide film, memory rewriting requires only a low voltage. Further, since the control gate is formed by a poly silicon film, both a positive voltage and a negative voltage can be applied to the control gate.
    Type: Grant
    Filed: August 18, 2005
    Date of Patent: January 1, 2008
    Assignee: Ricoh Company, Ltd.
    Inventors: Moriya Iwai, Masaaki Yoshida, Hiroaki Nakanishi
  • Publication number: 20070285730
    Abstract: Photoelectric conversion elements of line sensors (CIS22 to CIS26) arranged in a zigzag manner read a white reference plate to acquire a white reference read value A, and a white reference read average value AA is determined from the white reference read value A for each line sensor. Further, the photoelectric conversion elements read another white reference plate placed on a document support plate to acquire a white reference read value B, and a white reference read average value BB is determined from the white reference read value B for each of the line sensors (CIS22 to CIS26). By using the white reference read average values AA and BB, a sensitivity effect coefficient C used for uniforming the sensitivities different because of the variation of the distances from the line sensors (CIS22 to CIS26) to the document support plate is determined by dividing the average value BB by a data processing section for each of the photoelectric conversion element of the line sensors.
    Type: Application
    Filed: September 30, 2005
    Publication date: December 13, 2007
    Inventors: Makoto Suzuki, Masaaki Yoshida
  • Publication number: 20070224520
    Abstract: A polymer compound that, within a chemically amplified positive resist system, exhibits a significant change in alkali solubility from a state prior to exposure to that following exposure, as well as a photoresist composition that includes such a polymer compound and a method for forming a resist pattern, which are capable of forming fine patterns with a high level of resolution. The polymer compound includes, as an alkali-soluble group (i), a substituent group in which a group selected from amongst alcoholic hydroxyl groups, carboxyl groups, and phenolic hydroxyl groups is protected with an acid dissociable, dissolution inhibiting group (ii) represented by a general formula (1) shown below: [Formula 1] —CH2—O-AO—CH2—]n??(1) (wherein, A represents an organic group of 1 to 20 carbon atoms with a valency of at least n+1, and n represents an integer from 1 to 4).
    Type: Application
    Filed: April 5, 2005
    Publication date: September 27, 2007
    Inventors: Toshiyuki Ogata, Syogo Matsumaru, Hideo Hada, Masaaki Yoshida
  • Patent number: 7264918
    Abstract: A resist composition for liquid immersion lithography process, which comprises: (A) a polymer comprising (a1) alkali-soluble constitutional units each comprising an alicyclic group having both (i) a fluorine atom or a fluoroalkyl group and (ii) an alcoholic hydroxyl group, wherein the polymer changes in alkali-solubility due to the action of acid; and (B) an acid generator which generates acid due to exposure to light, and a method for forming a resist pattern using the resist composition. By the resist composition or the method, an adverse effect of the immersion liquid can be avoided while achieving high resolution and high depth of focus.
    Type: Grant
    Filed: March 24, 2004
    Date of Patent: September 4, 2007
    Assignee: Tokyo Ohka Kogyo Co., Ltd.
    Inventors: Kotaro Endo, Masaaki Yoshida, Taku Hirayama, Hiromitsu Tsuji, Toshiyuki Ogata, Mitsuru Sato
  • Publication number: 20070190436
    Abstract: A resist composition which is stable relative to solvents used in immersion lithography processes and displays excellent sensitivity and resist pattern profile, and a method of forming a resist pattern that uses such a resist composition are provided. The resist composition is in accordance with predetermined parameters, or is a positive resist composition comprising a resin component (A) which contains an acid dissociable, dissolution inhibiting group and displays increased alkali solubility under the action of acid, an acid generator component (B), and an organic solvent (C), wherein the component (A) contains a structural unit (a1) derived from a (meth)acrylate ester containing an acid dissociable, dissolution inhibiting group, but contains no structural units (a0), including structural units (a0-1) containing an anhydride of a dicarboxylic acid and structural units (a0-2) containing a phenolic hydroxyl group.
    Type: Application
    Filed: January 10, 2007
    Publication date: August 16, 2007
    Applicant: Tokyo Ohka Kogyo Co., Ltd.
    Inventors: Taku Hirayama, Hideo Hada, Satoshi Fujimura, Takeshi Iwai, Mitsuru Sato, Ryoichi Takasu, Toshikazu Tachikawa, Jun Iwashita, Keita Ishiduka, Tomotaka Yamada, Toshikazu Takayama, Masaaki Yoshida
  • Publication number: 20070178394
    Abstract: A resist composition which is stable relative to solvents used in immersion lithography processes and displays excellent sensitivity and resist pattern profile, and a method of forming a resist pattern that uses such a resist composition are provided. The resist composition is in accordance with predetermined parameters, or is a positive resist composition comprising a resin component (A) which contains an acid dissociable, dissolution inhibiting group and displays increased alkali solubility under the action of acid, an acid generator component (B), and an organic solvent (C), wherein the component (A) contains a structural unit (a1) derived from a (meth)acrylate ester containing an acid dissociable, dissolution inhibiting group, but contains no structural units (a0), including structural units (a0-1) containing an anhydride of a dicarboxylic acid and structural units (a0-2) containing a phenolic hydroxyl group.
    Type: Application
    Filed: January 10, 2007
    Publication date: August 2, 2007
    Applicant: Tokyo Ohka Kogyo Co., Ltd.
    Inventors: Taku Hirayama, Hideo Hada, Satoshi Fujimura, Takeshi Iwai, Mitsuru Sato, Ryoichi Takasu, Toshikazu Tachikawa, Jun Iwashita, Keita Ishiduka, Tomotaka Yamada, Toshikazu Takayama, Masaaki Yoshida
  • Publication number: 20070164346
    Abstract: A semiconductor device is disclosed that includes a nonvolatile memory cell having a memory transistor and a selection transistor, and a peripheral circuit transistor. The memory transistor includes a memory gate oxide film that is arranged on a semiconductor substrate, and a floating gate made of polysilicon that is arranged on the memory gate oxide film. The selection transistor is serially connected to the memory transistor and includes a selection gate oxide film that is arranged on the semiconductor substrate, and a selection gate made of polysilicon that is arranged on the selection gate oxide film. The peripheral circuit transistor includes a peripheral circuit gate oxide film that is arranged on the semiconductor substrate, and a peripheral circuit gate made of polysilicon that is arranged on the peripheral circuit gate oxide film. The memory gate oxide film is arranged to be thinner than the peripheral circuit gate oxide film.
    Type: Application
    Filed: December 19, 2005
    Publication date: July 19, 2007
    Inventor: Masaaki Yoshida
  • Publication number: 20070134593
    Abstract: Provided are a material for forming a resist protecting film which is for use in a liquid immersion lithography process and which is formed on a resist film, wherein the material has the following properties of: being transparent with respect to exposure light; having substantially no compatibility with a liquid for liquid immersion lithography; and causing no mixing with the resist film, a composite film comprising a protective film formed from the material and a resist film, and a method for forming a resist pattern using them. These can prevent both the resist film and the liquid used from changing in properties during the liquid immersion lithography, so that a resist pattern with high resolution can be formed using the liquid immersion lithography.
    Type: Application
    Filed: February 6, 2007
    Publication date: June 14, 2007
    Inventors: Taku Hirayama, Ryoichi Takasu, Mitsuru Sato, Kazumasa Wakiya, Masaaki Yoshida, Koki Tamura
  • Patent number: 7217384
    Abstract: A runner-less molding device for thermosetting resins and rubbers, characterized by a movable runner bush (15), through which an uncured or unvulcanized fluid material kept at a low temperature supplied from a pouring nozzle (31) can flow, is slidably arranged in a temperature controlling bush (13) communicating with a gate (4) of a cavity (1); an insulation space (A) is formed by moving the movable runner bush (15) apart from the gate (4) during heating; a valve pin (18) is movably inserted into said movable runner bush (15); and the valve pin (18) is arranged so as to open and close the gate (4) in accordance with a pouring operation of the fluid material.
    Type: Grant
    Filed: October 1, 2002
    Date of Patent: May 15, 2007
    Assignee: Seiki Corporation
    Inventors: Yoshiaki Tanaka, Masaaki Yoshida
  • Publication number: 20070031755
    Abstract: The resist protective film forming material for liquid immersion lithography is provided, which is suitable when the non-aqueous solution with a high transparency and high refractive index exemplified by the fluorinated liquid is used. The resist protective film forming material includes at least one component selected from water-soluble and alkali-soluble film forming components. The liquid immersion lithography process improves the resolution of resist patterns by irradiating a light beam on a resist film interposing a given thickness of the non-aqueous solution with a refractive index higher than that of the air at least on the resist film in a path, along where the lithography exposing light beam passes to the resist film.
    Type: Application
    Filed: August 25, 2004
    Publication date: February 8, 2007
    Applicant: TOKO OHKA KOGYO CO., LTD.
    Inventors: Taku Hirayama, Kotaro Endo, Masaaki Yoshida, Kazumasa Wakiya
  • Publication number: 20060210913
    Abstract: A high-molecular compound and a low-molecular compound or both having an alkali-soluble site (i) wherein at least a part of the alkali-soluble site (i) is protected with (ii) a halogen atom-containing acetal type acid-dissociative, dissolution inhibiting group, as well as a photoresist composition comprising the same. The photoresist composition is highly stable during storage and can give a resist pattern excellent in sectional rectangular shape and having high transparency to an exposure light, particularly a light having a wavelength of 300 nm or less.
    Type: Application
    Filed: April 15, 2004
    Publication date: September 21, 2006
    Inventors: Toshiyuki Ogata, Kotaro Endo, Hiromitsu Tsuji, Masaaki Yoshida, Mitsuru Sato, Syogo Matsumaru, Hideo Hada
  • Publication number: 20060166130
    Abstract: A photoresist composition containing a polymer (A) containing an alkali-soluble constituent unit (a1) containing an alicyclic group having both a fluorine atom or a fluorinated alkyl group (i) and an alcoholic hydroxyl group (ii), whose alkali-solubility is changeable by an action of an acid; an acid generator (B) which generates an acid by light irradiation; and a dissolution inhibitor (C) having a fluorine atom(s) and/or a nitrogen-containing compound (D) selected from a tertiary amine (d1) having a polar group, a tertiary alkylamine (d2) having 7 or more and 15 or less of carbon atoms or an ammonium salt (d3). The composition has a resist property capable of accomplishing line and space (1:1) of 90 nm or less in good shape as a pattern processing accuracy of a semiconductor integrated circuit by lithography.
    Type: Application
    Filed: March 24, 2004
    Publication date: July 27, 2006
    Inventors: Toshiyuki Ogata, Kotaro Endo, Hiromitsu Tsuji, Masaaki Yoshida
  • Publication number: 20060154188
    Abstract: An immersion fluid for use in liquid immersion lithography in which a resist film is exposed to light via a fluid. The fluid is transparent to the exposure light used in the liquid immersion lithography and comprises a fluorine-based liquid having a boiling point of 70 to 270° C. A method of forming resist patter includes a step of placing the immersion fluid directly on the resist film or a protective film deposited on the resist film. The present invention prevents alteration of resist film and other films as well as alteration of the fluid during liquid immersion lithography and enables high resolution resist patterning using liquid immersion lithography.
    Type: Application
    Filed: March 4, 2004
    Publication date: July 13, 2006
    Inventors: Taku Hirayama, Mitsuru Sato, Kazumasa Wakiya, Jyun Iwashita, Masaaki Yoshida
  • Publication number: 20060154170
    Abstract: A resist composition for liquid immersion lithography process, which comprises: (A) a polymer comprising (a1) alkali-soluble constitutional units each comprising an alicyclic group having both (i) a fluorine atom or a fluoroalkyl group and (ii) an alcoholic hydroxyl group, wherein the polymer changes in alkali-solubility due to the action of acid; and (B) an acid generator which generates acid due to exposure to light, and a method for forming a resist pattern using the resist composition. By the resist composition or the method, an adverse effect of the immersion liquid can be avoided while achieving high resolution and high depth of focus.
    Type: Application
    Filed: March 24, 2004
    Publication date: July 13, 2006
    Inventors: Kotaro Endo, Masaaki Yoshida, Taku Hirayama, Hiromitsu Tsuji, Toshiyuki Ogata, Mitsuru Sato
  • Publication number: 20060141400
    Abstract: Provided are a material for forming a resist protecting film which is for use in a liquid immersion lithography process and which is formed on a resist film, wherein the material has the following properties of: being transparent with respect to exposure light; having substantially no compatibility with a liquid for liquid immersion lithography; and causing no mixing with the resist film, a composite film comprising a protective film formed from the material and a resist film, and a method for forming a resist pattern using them. These can prevent both the resist film and the liquid used from changing in properties during the liquid immersion lithography, so that a resist pattern with high resolution can be formed using the liquid immersion lithography.
    Type: Application
    Filed: February 20, 2004
    Publication date: June 29, 2006
    Inventors: Taku Hirayama, Ryoichi Takasu, Mitsuru Sato, Kazumasa Wakiya, Masaaki Yoshida, Koki Tamura
  • Publication number: 20050275041
    Abstract: A semiconductor device is capable of being applied with both a positive and a negative voltage to its control gate, and writing to its memory requires a low voltage. A control gate is formed on a memory unit region of a field oxide film, and an inter-layer silicon oxide film is formed on its surface. A gate oxide film for a non-volatile memory is formed on a P substrate between N type diffusion layers. The floating gate is formed on the inter-layer silicon oxide film, the field oxide film, and the gate oxide film for the non-volatile memory. Since a large coupling ratio between the control gate and the floating gate is available on the field oxide film, memory rewriting requires only a low voltage. Further, since the control gate is formed by a poly silicon film, both a positive voltage and a negative voltage can be applied to the control gate.
    Type: Application
    Filed: August 18, 2005
    Publication date: December 15, 2005
    Inventors: Moriya Iwai, Masaaki Yoshida, Hiroaki Nakanishi