Patents by Inventor Takuma Hojo

Takuma Hojo 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: 8785582
    Abstract: A vinyloxy group-containing vinyl polymer, useful as a heat or light curing reactive prepolymer, containing at least a constituent unit expressed by the following formula (I):
    Type: Grant
    Filed: September 28, 2009
    Date of Patent: July 22, 2014
    Assignee: Nippon Carbide Industries Co., Ltd.
    Inventors: Takuma Hojo, Kyoko Yamamoto, Hiroki Fujiwara, Kazuhiko Atsumi, Take-aki Mitsudo
  • Publication number: 20130245189
    Abstract: A vinyloxy group-containing vinyl polymer, useful as a heat or light curing reactive prepolymer, containing at least a constituent unit expressed by the following formula (I):
    Type: Application
    Filed: September 28, 2009
    Publication date: September 19, 2013
    Applicant: NIPPON CARBIDE INDUSTRIES CO., INC.
    Inventors: Takuma Hojo, Kyoko Yamamaoto, Hiroki Fujiwara, Kazuhiko Atsumi, take-aki Mitsudo
  • Patent number: 7727701
    Abstract: A positive resist composition that exhibits a large exposure margin, and excellent levels of resolution and dry etching resistance, as well as a method of forming a resist pattern that uses the positive resist composition.
    Type: Grant
    Filed: January 14, 2005
    Date of Patent: June 1, 2010
    Assignee: Tokyo Ohka Kogyo Co., Ltd.
    Inventors: Takuma Hojo, Kiyoshi Ishikawa, Tomoyuki Ando
  • Patent number: 7687221
    Abstract: Disclosed is a positive resist composition which can provide a positive resist composition and a resist pattern forming method, capable of forming a high resolution pattern with reduce LER, the positive resist composition comprising a resin component (A) which has acid dissociable, dissolution inhibiting groups and exhibits increased alkali solubility under the action of an acid, and an acid generator component (B) which generates an acid under exposure, wherein the resin component (A) contains a polymer compound (A1) having a structural unit (a1) derived from hydroxystyrene and a structural unit (a2) derived from an acrylate ester having acid dissociable, dissolution inhibiting groups, a fluorine atom or a fluorinated lower alkyl group being bonded at the ?-position.
    Type: Grant
    Filed: December 14, 2005
    Date of Patent: March 30, 2010
    Assignee: Tokyo Ohka Kogyo Co., Ltd.
    Inventors: Taako Hirosaki, Tomoyuki Ando, Takuma Hojo
  • Publication number: 20090155546
    Abstract: Disclosed are a film-forming composition which can form a pattern having an enhanced contrast by the action of uneven surface morphology produced after image development, and a method for forming a pattern and a three-dimensional mold using the composition. A composition comprising at least one of a hydrolysate and a condensation product of an alkoxy metal compound represented by the chemical formula (A), the composition additionally comprising a compound which can respond to at least one of light and heat to control the solubility of a finished film in a developing solution. R1n-M(OR2)4-n??(A) wherein M represents a silicon, a germanium, a titanium, a tantalum, an indium or a tin; R1 represents a hydrogen atom or a monovalent organic group; R2 represents a monovalent organic group; and n represents an integer of 1 to 3.
    Type: Application
    Filed: August 28, 2006
    Publication date: June 18, 2009
    Applicant: TOKYO OHKA KOGYO CO., LTD.
    Inventors: Naoki Yamashita, Kiyoshi Ishikawa, Yoshinori Sakamoto, Takuma Hojo
  • Patent number: 7524604
    Abstract: The invention provides a positive resist composition which has high etching resistance and attains high resolution, and a method of forming patterns by using the positive resist composition.
    Type: Grant
    Filed: April 15, 2004
    Date of Patent: April 28, 2009
    Assignee: Tokyo Ohka Kogyo Co., Ltd
    Inventors: Takuma Hojo, Kiyoshi Ishikawa
  • Publication number: 20090047600
    Abstract: Disclosed is a positive resist composition which can provide a positive resist composition and a resist pattern forming method, capable of forming a high resolution pattern with reduce LER, the positive resist composition comprising a resin component (A) which has acid dissociable, dissolution inhibiting groups and exhibits increased alkali solubility under the action of an acid, and an acid generator component (B) which generates an acid under exposure, wherein the resin component (A) contains a polymer compound (A1) having a structural unit (a1) derived from hydroxystyrene and a structural unit (a2) derived from an acrylate ester having acid dissociable, dissolution inhibiting groups, a fluorine atom or a fluorinated lower alkyl group being bonded at the ?-position.
    Type: Application
    Filed: December 14, 2005
    Publication date: February 19, 2009
    Applicant: TOKYO OHKA KOGYO CO., LTD.
    Inventors: Takako Hirosaki, Tomoyuki Ando, Takuma Hojo
  • Patent number: 7449276
    Abstract: The invention provides a positive photoresist composition which exhibits a high level of etching resistance and attains high resolution, and enables the formation of a fine pattern using an electron beam exposure step, as well as a method for forming a resist pattern that uses the positive photoresist composition. This positive photoresist composition for use with EB contains a resin component (A) that exhibits increased alkali solubility under the action of acid, an acid generator component (B) that generates acid on exposure, and an organic solvent (C), wherein the component (A) comprises a copolymer containing a first structural unit (a1) derived from hydroxystyrene and a second structural unit (a2) derived from a (meth)acrylate ester having an alcoholic hydroxyl group, and a portion of the hydroxyl groups of the structural units (a1) and the alcoholic hydroxyl groups of the structural units (a2) are protected with acid dissociable, dissolution inhibiting groups.
    Type: Grant
    Filed: April 22, 2004
    Date of Patent: November 11, 2008
    Assignee: Tokyo Ohka Kogyo Co., Ltd.
    Inventors: Takuma Hojo, Kiyoshi Ishikawa, Tsuyoshi Nakamura, Tasuku Matsumiya
  • Publication number: 20080241747
    Abstract: A positive resist composition that exhibits a large exposure margin, and excellent levels of resolution and dry etching resistance, as well as a method of forming a resist pattern that uses the positive resist composition.
    Type: Application
    Filed: January 14, 2005
    Publication date: October 2, 2008
    Applicant: TOKYO OHKA KOGYO CO., LTD.
    Inventors: Takuma Hojo, Kiyoshi Ishikawa, Tomoyuki Ando
  • Publication number: 20070190447
    Abstract: The photoresist composition is formed by including the fullerene derivative (A) having two or more malonic ester residues. Preferably, the malonic ester residue is, a group is preferably expressed by the general formula (1) below. In the formula (1), R1 and R2 independently represent an alkyl group, which may be identical or different from each other. The alkyl group is a normal or branched chain, or cyclic alkyl group having 1 to 10 carbons, and n is an integer from 2 to 10.
    Type: Application
    Filed: February 1, 2005
    Publication date: August 16, 2007
    Applicant: Tokyo Ohkakogyo Co. LTD.
    Inventors: Toshiyuki Ogata, Takuma Hojo, Hiromitsu Tsuji, Takako Hirosaki, Mitsuru Sato
  • Publication number: 20070042288
    Abstract: The invention provides a positive photoresist composition which exhibits a high level of etching resistance and attains high resolution, and enables the formation of a fine pattern using an electron beam exposure step, as well as a method for forming a resist pattern that uses the positive photoresist composition. This positive photoresist composition for use with EB contains a resin component (A) that exhibits increased alkali solubility under the action of acid, an acid generator component (B) that generates acid on exposure, and an organic solvent (C), wherein the component (A) comprises a copolymer containing a first structural unit (a1) derived from hydroxystyrene and a second structural unit (a2) derived from a (meth)acrylate ester having an alcoholic hydroxyl group, and a portion of the hydroxyl groups of the structural units (a1) and the alcoholic hydroxyl groups of the structural units (a2) are protected with acid dissociable, dissolution inhibiting groups.
    Type: Application
    Filed: April 22, 2004
    Publication date: February 22, 2007
    Inventors: Takuma Hojo, Kiyoshi Ishikawa, Tsuyoshi Nakamura, Tasuku Matsumiya
  • Publication number: 20060247346
    Abstract: The invention provides a positive resist composition which has high etching resistance and attains high resolution, and a method of forming patterns by using the positive resist composition.
    Type: Application
    Filed: April 15, 2004
    Publication date: November 2, 2006
    Inventors: Takuma Hojo, Kiyoshi Ishikawa