Patents by Inventor Mitsuru Sakai

Mitsuru Sakai 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: 8111596
    Abstract: A phase error detection apparatus capable of performing offset correction of a tracking error signal accurately even when there is a defect or a non-recorded position on an optical disc. There are provided a phase difference detection circuit (107) which receives two sequences of digital signals, performs phase comparison using a distance between zerocross points of the two sequences of digital signals, and outputs a phase comparison result PCR and a phase comparison completion signal PCC, and an offset control circuit (11) which outputs an offset correction amount for each phase comparison completion signal PCC from the phase difference detection circuit (107), and the offset correction amount ?? is added to the phase comparison result PCR to avoid offset correction in a position where phase comparison is not carried out.
    Type: Grant
    Filed: May 30, 2006
    Date of Patent: February 7, 2012
    Assignee: Panasonic Corporation
    Inventors: Mitsuru Sakai, Yoshihiro Kanda, Takashige Hiratsuka
  • Patent number: 8000213
    Abstract: There is provided an optical disc recording/reproducing apparatus which can reduce the chip size using the high-miniaturization process and can enhance the detection accuracy. A signal which is obtained by amplitude-adjusting a header region in a reproduced signal detected by an optical pickup (1) is digitized, and peak detection or bottom detection from the reproduced signal in each of a first section and a second section in the header region is performed by detection circuits (9) to (12), respectively. Then, amplitude data in the first section and the second section are obtained by subtracters (13) and (14) from the detected values in the respective detection circuits. A difference in amplitude between the first section and the second section in the header region is obtained by a subtracter (15) based on the amplitude data, and the amplitude difference is outputted as an off-track error signal.
    Type: Grant
    Filed: June 27, 2008
    Date of Patent: August 16, 2011
    Assignee: Panasonic Corporation
    Inventors: Dai Ichiryu, Mitsuru Sakai
  • Publication number: 20100195464
    Abstract: A first comparator (112a) compares a first voltage signal to a predetermined threshold to output a first binary signal corresponding to a comparison result. A second comparator (112b) compares a second voltage signal to a predetermined threshold to output a second binary signal corresponding to a comparison result. A first digital sampling section (113a) samples the first binary signal output by the first comparator 112a to generate a first sampling signal. A second digital sampling section (113b) samples the second binary signal output by the second comparator (112b) to generate a second sampling signal. A phase difference detector circuit (114) detects a phase difference between the first sampling signal generated by the first digital sampling section (113a) and the second sampling signal generated by the second digital sampling section (113b).
    Type: Application
    Filed: July 2, 2008
    Publication date: August 5, 2010
    Applicant: PANASONIC CORPORATION
    Inventors: Tsuyoshi Katayama, Takeharu Yamamoto, Mitsuru Sakai
  • Publication number: 20100195467
    Abstract: There is provided an optical disc recording/reproducing apparatus which can reduce the chip size using the high-miniaturization process and can enhance the detection accuracy. A signal which is obtained by amplitude-adjusting a header region in a reproduced signal detected by an optical pickup (1) is digitized, and peak detection or bottom detection from the reproduced signal in each of a first section and a second section in the header region is performed by detection circuits (9) to (12), respectively. Then, amplitude data in the first section and the second section are obtained by subtracters (13) and (14) from the detected values in the respective detection circuits. A difference in amplitude between the first section and the second section in the header region is obtained by a subtracter (15) based on the amplitude data, and the amplitude difference is outputted as an off-track error signal.
    Type: Application
    Filed: June 27, 2008
    Publication date: August 5, 2010
    Applicant: PANASONIC CORPORATION
    Inventors: Dai Ichiryu, Mitsuru Sakai
  • Publication number: 20090185468
    Abstract: A phase error detection apparatus capable of performing offset correction of a tracking error signal accurately even when there is a defect or a non-recorded position on an optical disc. There are provided a phase difference detection circuit (107) which receives two sequences of digital signals, performs phase comparison using a distance between zerocross points of the two sequences of digital signals, and outputs a phase comparison result PCR and a phase comparison completion signal PCC, and an offset control circuit (11) which outputs an offset correction amount for each phase comparison completion signal PCC from the phase difference detection circuit (107), and the offset correction amount ?? is added to the phase comparison result PCR to avoid offset correction in a position where phase comparison is not carried out.
    Type: Application
    Filed: May 30, 2006
    Publication date: July 23, 2009
    Inventors: Mitsuru Sakai, Yoshihiro Kanda, Takashige Hiratsuka
  • Publication number: 20070073064
    Abstract: There is provided an industrial production method of an aminopyrrolidine derivative having chemokine receptor antagonist activity represented by the following formula, a synthetic intermediate thereof and a production method thereof: wherein R11 is H, C1-C6 alkyl or C2-C7 alkanoyl; R12, R14, R15, R16 and R17 are H, halogen, optionally halogenated C1-C6 alkyl, optionally halogenated C1-C6 alkoxy, hydroxyl or C2-C7 alkoxycarbonyl; R23, R24, R25 and R26 are H, halogen, optionally halogenated C1-C6 alkyl, optionally halogenated C1-C6 alkoxy or hydroxyl; and R3 is H or C1-C6 alkyl.
    Type: Application
    Filed: October 7, 2004
    Publication date: March 29, 2007
    Applicant: TEIJIN PHARMA LIMITED
    Inventors: Takumi Takeyasu, Yoshinori Sato, Minoru Imai, Mitsuru Sakai, Kenji Manabe, Yoshiyuki Matsumoto, Susumu Takeuchi, Asahi Kawana, Masahiro Koga, Mitsuharu Asahita
  • Publication number: 20050143478
    Abstract: A catalyst for preparing a polyurethane, containing triethylenediamine (component A), and at least one or more members selected from the group consisting of 1,8-diazabicyclo[5.4.0]undecene-7,1,5-diazabicyclo[4.3.0]nonene-5 and salts thereof (component B); a process for preparing a polyurethane, having the step of reacting a polyisocyanate component with a polyol component in the presence of the above-mentioned catalyst for preparing a polyurethane; and a polyurethane prepared by reacting a polyisocyanate component with a polyol component in the presence of the above-mentioned catalyst for preparing a polyurethane. The polyurethane of the present invention is suitably used, for example, for shoe soles for business shoes, sports shoes and the like, particularly for its outer soles.
    Type: Application
    Filed: December 22, 2004
    Publication date: June 30, 2005
    Inventors: Mitsuru Sakai, Koei Hosokawa
  • Publication number: 20050118666
    Abstract: A method for assaying concentrations of Coenzyme A (CoA) molecules in biological samples with high sensitivity and high reproducibility, the method comprising a step of extraction from a biological sample using a strongly acidic solution, a step of solid phase extraction, a step of adding an internal standard substance, and a step of detection by LC-MS.
    Type: Application
    Filed: March 24, 2003
    Publication date: June 2, 2005
    Applicant: TEIJIN LIMITED
    Inventors: Mitsuru Sakai, Yoshinori Sugimoto
  • Patent number: 6767929
    Abstract: A catalyst for producing a polyurethane, comprising a dialkylaminoalkyl alcohol represented by the formula (I): R1R2N—X—OH  (I) wherein each of R1 and R2 is independently an alkyl group having 1 to 4 carbon atoms; and X is a branched alkylene group having 4 to 8 carbon atoms; a process for producing a polyurethane, comprising reacting a polyol component with an isocyanate component in the presence of the above-mentioned catalyst for producing a polyurethane; and a process for producing a polyurethane foam, comprising reacting a polyol component with an isocyanate component in the presence of the above-mentioned catalyst for producing a polyurethane, and a compound having a primary amino group and a tertiary amino group in its molecule, and a blowing agent.
    Type: Grant
    Filed: June 17, 2002
    Date of Patent: July 27, 2004
    Assignee: Kao Corporation
    Inventors: Atsushi Ishikawa, Mitsuru Sakai, Masayoshi Morii
  • Publication number: 20030004220
    Abstract: A catalyst for producing a polyurethane, comprising a dialkylaminoalkyl alcohol represented by the formula (I):
    Type: Application
    Filed: June 17, 2002
    Publication date: January 2, 2003
    Inventors: Atsushi Ishikawa, Mitsuru Sakai, Masayoshi Morii
  • Patent number: 6410608
    Abstract: A process for producing a polyurethane foam comprising reacting a polyol component with an isocyanate component in the presence of a catalyst comprising a compound represented by the formula (I): wherein p is an integer of 4 to 8, and a compound having a primary amino group and a tertiary amino group in its molecule, a blowing agent and a surfactant. The polyurethane foam obtained by the process of the present invention can be suitably used for heat insulating materials for construction materials, electric refrigerators, refrigerated warehouses, baths and the like, interior materials for automobiles, and the like.
    Type: Grant
    Filed: April 27, 2001
    Date of Patent: June 25, 2002
    Assignee: Kao Corporation
    Inventors: Mitsuru Sakai, Atsushi Ishikawa, Masayoshi Morii
  • Patent number: 6306918
    Abstract: A semi-rigid polyurethane foam having a strength retention of not less than 70% when allowing it to stand at 120° C. for 24 hours, and a Haze value of not more than 2 as determined by Fogging test, prepared by mixing a polyol mixture comprising a polyol, water and a catalyst with a polyisocyanate, and foaming the resulting mixture, and a process for preparing the same. The semi-rigid polyurethane foam would not cause fogging under high-temperature conditions, and can be suitably used for interior materials of automobiles such as headrests and armrests.
    Type: Grant
    Filed: August 31, 1999
    Date of Patent: October 23, 2001
    Assignee: Kao Corporation
    Inventors: Mitsuru Sakai, Atsushi Ishikawa, Masayoshi Morii
  • Patent number: 6271416
    Abstract: The present invention relates to a simple method for preparing a quinolinone derivative, which is effective as a medicine, e.g., as an agent for treating allergic diseases and the like; novel amide derivatives effective as an intermediate in the method, novel quinolinone derivatives obtained according to the method; and an anti-allergic agent containing a quinolinone derivative and/or physiological salt of the same as the active ingredients.
    Type: Grant
    Filed: June 20, 2000
    Date of Patent: August 7, 2001
    Assignee: Dainippon Ink and Chemicals, Inc.
    Inventors: Hidetsugu Takagaki, Shinobu Yamaguchi, Masayoshi Abe, Mitsuru Sakai, Osamu Misumi
  • Patent number: 6136822
    Abstract: The present invention relates to a simple method for preparing a quinolinone derivative, which is effective as a medicine, e.g., as an agent for treating allergic diseases and the like; novel amide derivatives effective as an intermediate in the method; novel quinolinone derivatives obtained according to the method; and an anti-allergic agent containing a quinolinone derivative and/or physiological salt of the same as the active ingredients. The quinolinone derivative is expressed by the following general formula (II); and the method is characterized in that an amide derivative, expressed by the following formula (I), is reacted with a basic agent, followed by intramolecular ring formation: ##STR1## wherein R.sub.1 represents a hydrogen atom, an alkyl group, an alkyl group containing a hydroxyl group an alkenyl group, or an aryl group; R.sub.2 represents an alkyl group, an alkenyl group, an aryl group, or an aralkyl group; R.sub.3 represents a reactive carboxyl group; and R.sub.4 to R.sub.
    Type: Grant
    Filed: December 1, 1998
    Date of Patent: October 24, 2000
    Assignee: Dainippon Ink and Chemicals, Inc.
    Inventors: Hidetsugu Takagaki, Shinobu Yamaguchi, Masayoshi Abe, Mitsuru Sakai, Osamu Misumi
  • Patent number: 6114352
    Abstract: The present invention offers 7-aminoquinolinone derivatives, physiologically acceptable salts thereof, anti-allergic agents having as an active ingredient a 7-aminoquinolinone derivative or physiologically acceptable salt thereof, and 7-nitroquinolinone derivatives, wherein the 7-aminoquinolinone derivative is expressed by the following general formula (I): ##STR1## wherein R.sub.1 is a hydrogen atom or an alkyl group;R.sub.2 and R.sub.3 are mutually different groups, each of which is selected from among hydrogen atoms, acyl groups, alkyl groups or alkenyl groups; andR.sub.4 and R.sub.5 are mutually different or identical groups, each of which is selected from among hydrogen atoms, acyl groups, alkyl groups, alkenyl groups or aralkyl groups;and physiologically acceptable salts thereof.
    Type: Grant
    Filed: December 30, 1998
    Date of Patent: September 5, 2000
    Assignee: Dainippon Ink and Chemicals, Inc.
    Inventors: Hidetsugu Takagaki, Masayoshi Abe, Mitsuru Sakai, Yasuo Aoki, Shigenori Nakanishi, Nobuyuki Kimura, Akihide Koda
  • Patent number: 6099955
    Abstract: A urethane foam for shoe soles prepared by reacting a compound having at least two isocyanate-reactive hydrogen atoms and a molecular weight of 400 to 10000 with a polyisocyanate in the presence of a foam stabilizer, water and a catalyst, characterized in that the ratio r.sub.1 /r.sub.2 of a mean skill cell diameter r.sub.1 to a mean core cell diameter r.sub.2 is 0.02 to 0.80, wherein the mean skin cell diameter r.sub.1 is defined as the mean diameter of the cells which form the skin portion of a urethane foam extending from the surface to a depth of 5% of the foam thickness and the mean core cell diameter r.sub.2 is defined as the mean diameter of the cells which form the core portion of a urethane foam extending from a depth of 40% to a depth of 60% of the foam thickness.
    Type: Grant
    Filed: September 3, 1998
    Date of Patent: August 8, 2000
    Assignee: Kao Corporation
    Inventors: Mitsuru Sakai, Shoichiro Harada, Kazunari Takemura, Akito Itoi, Makoto Okubo
  • Patent number: 5942521
    Abstract: The present invention offers 7-aminoquinolinone derivatives, physiologically acceptable salts thereof, anti-allergic agents having as an active ingredient a 7-aminoquinolinone derivative or physiologically acceptable salt thereof, and 7-nitroquinolinone derivatives, wherein the 7-aminoquinolinone derivative is expressed by the following general formula (I): ##STR1## wherein R.sub.1 is a hydrogen atom or an alkyl group;R.sub.2 and R.sub.3 are mutually different groups, each of which is selected from among hydrogen atoms, acyl groups, alkyl groups or alkenyl groups; andR.sub.4 and R.sub.5 are mutually different or identical groups, each of which is selected from among hydrogen atoms, acyl groups, alkyl groups, alkenyl groups or aralkyl groups; and physiologically acceptable salts thereof.
    Type: Grant
    Filed: January 16, 1997
    Date of Patent: August 24, 1999
    Assignee: Dainippon Ink and Chemicals, Inc.
    Inventors: Hidetsugu Takagaki, Masayoshi Abe, Mitsuru Sakai, Yasuo Aoki, Shigenori Nakanishi, Nobuyuki Kimura, Akihide Koda
  • Patent number: 5821554
    Abstract: A polyester-polyol prepared by polycondensation of an acid component comprising terephthalic acid and adipic acid, and a polyhydric alcohol component, wherein the molar ratio of the terephthalic acid/adipic acid is 0.05 to 0.3; a process for preparing a polyurethane foam comprising reacting a polyisocyanate component and a polyol component, wherein the polyol component contains the above polyester-polyol; and a process for preparing a polyurethane foam comprising reacting an isocyanate prepolymer made of a polyisocyanate component and a polyol component (I) with a polyol component (II), wherein the polyol component (I) comprises the above polyester-polyol.
    Type: Grant
    Filed: March 12, 1997
    Date of Patent: October 13, 1998
    Assignee: Kao Corporation
    Inventors: Shoichiro Harada, Mitsuru Sakai, Kazunari Takemura, Akito Itoi, Makoto Okubo
  • Patent number: 5616631
    Abstract: Sand compositions containing a binder composition and a curing agent, in which the binder composition comprises (a) a binder comprising an acid-curable resin and (b) from 0.5 to 63.0% by weight, based on the binder composition, of at least one curing accelerator selected from compounds represented by formula (1): ##STR1## wherein X.sub.1, X.sub.2 each represent a hydrogen atom, a methyl group or an ethyl group;exhibit an increased curing rate to provide a casting mold having an increased initial strength.
    Type: Grant
    Filed: October 31, 1995
    Date of Patent: April 1, 1997
    Assignee: Kao Corporation
    Inventors: Kazuhiko Kiuchi, Shigeo Nakai, Masuo Sawa, Masayuki Kato, Mitsuru Sakai, Shinya Nomura
  • Patent number: 5580552
    Abstract: A 7-glycosyloxybenzopyran derivative represented by the following formula (I) ##STR1## wherein, R is a hydrogen atom, an acyl group, an alkyl group, a cycloalkyl group, an alkenyl group or an aralkyl group, R.sub.2 is a hydrogen atom, an alkyl group, a cycloalkyl group, an alkenyl group or an aralkyl group and R.sub.3 is a glycosyl group whose hydroxyl group is protected or not protected, selected from the group consisting of glucosyl, mannosyl and galactosyl groups, and physiologically acceptable salts thereof.
    Type: Grant
    Filed: May 19, 1995
    Date of Patent: December 3, 1996
    Assignee: Dainippon Ink & Chemicals Inc.
    Inventors: Hidetsugu Takagaki, Masayoshi Abe, Yasuo Aoki, Mitsuru Sakai, Nobuyuki Kimura