Patents by Inventor Mariko Yamashita

Mariko Yamashita 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: 20210143253
    Abstract: A semiconductor device includes a semiconductor substrate of a first conductivity type, a semiconductor layer of the first conductivity type provided on the semiconductor substrate, a first deep semiconductor region of a second conductivity type provided between the semiconductor substrate and the semiconductor layer, a first guard ring region of the second conductivity type, a first separation region of the second conductivity type contacting the first guard ring region and the first deep semiconductor region, a first semiconductor region of the first conductivity type, and a second semiconductor region of the first conductivity type; the first guard ring region and the first deep semiconductor region surround a first device part of the semiconductor layer; the first separation region partitions the first device part into a first region and a second region; and the first and second semiconductor regions are provided in the first and second regions.
    Type: Application
    Filed: July 13, 2020
    Publication date: May 13, 2021
    Inventors: Mariko Yamashita, Kanako Komatsu, Yoshiaki Ishii, Daisuke Shinohara
  • Publication number: 20200409282
    Abstract: A toner containing a toner particle that contains a binder resin and a crystalline material, wherein, in measurement of powder dynamic viscoelasticity of the toner, when T(A)° C. is taken as an onset temperature for a storage elastic modulus E? obtained at a ramp rate of 20° C./min, EA?(100) Pa is taken as a storage elastic modulus at 100° C. obtained at a ramp rate of 20° C./min, and T(B)° C. is taken as an onset temperature for a storage elastic modulus E? obtained at a ramp rate of 5° C./min, T(A)?T(B) is 3.0° C. or less, T(A) is from 45.0° C. to 70.0° C., and EA?(100) is from 4.0×109 Pa to 6.5×109 Pa.
    Type: Application
    Filed: June 23, 2020
    Publication date: December 31, 2020
    Inventors: Tomohiro Unno, Kosuke Fukudome, Ryo Nagata, Tetsuya Kinumatsu, Mariko Yamashita
  • Publication number: 20200409283
    Abstract: A toner including a toner particle including a binder resin and a crystalline material, wherein in powder dynamic viscoelasticity measurement of the toner, where an onset temperature of a storage elastic modulus E? obtained when a temperature is raised at 20° C./min is denoted by T(A)° C., and an onset temperature of a storage elastic modulus E? obtained when a temperature is raised at 5° C./min is denoted by T(B)° C., T(A)?T(B) is 3.0° C. or less, in DSC of the toner, a peak temperature of a maximum endothermic peak is from 50.0° C. to 90.0° C., and an amount of a tetrahydrofuran-insoluble component in the binder resin is from 15% by mass to 60% by mass.
    Type: Application
    Filed: June 23, 2020
    Publication date: December 31, 2020
    Inventors: Tetsuya Kinumatsu, Tomohiro Unno, Mariko Yamashita, Ryo Nagata, Kosuke Fukudome
  • Publication number: 20200363745
    Abstract: A toner comprising a toner particle including a binder resin and a magnetic body, wherein in cross-sectional observation of the toner with a transmission electron microscope, where an area percentage occupied by the magnetic body in a region of 200 nm or less from a contour of a cross section of the toner particle to a centroid of the cross section is taken as A1, and an area percentage occupied by the magnetic body in a region of from 200 nm to 400 nm from the contour of the cross section of the toner particle to the centroid of the cross section is taken as A2, the area percentage A1 is from 38% to 85%, the area percentage A2 is from 0% to 37%, and a ratio A2/A1 of the area percentage A2 to the area percentage A1 is from 0 to 0.75.
    Type: Application
    Filed: May 1, 2020
    Publication date: November 19, 2020
    Inventors: Ryo Nagata, Kosuke Fukudome, Tetsuya Kinumatsu, Tomohiro Unno, Mariko Yamashita
  • Publication number: 20200363744
    Abstract: A toner comprising a toner particle including a binder resin, wherein the toner is such that (1) when a powder dynamic viscoelasticity measurement method is used, a measurement start temperature is set to 25° C., and a ramp rate is set to 20° C./min, on a curve of a storage elastic modulus E? (Pa) where a temperature (° C.) is plotted against an abscissa and the storage elastic modulus E? is plotted against an ordinate, a temperature at a time when the E? at a start of a measurement has decreased by 50% is from 60° C. to 90° C., and (2) a load at a yield point of a displacement-load curve which is determined by a nanoindentation method and where a load (mN) is plotted against an ordinate and a displacement amount (?m) is plotted against an abscissa, is 0.80 mN or more; and a method for producing thereof.
    Type: Application
    Filed: May 1, 2020
    Publication date: November 19, 2020
    Inventors: Mariko Yamashita, Tetsuya Kinumatsu, Tomohiro Unno, Ryo Nagata, Kosuke Fukudome
  • Patent number: 10782623
    Abstract: A toner comprising: a toner particle that contains a binder resin and a colorant: and an external additive, wherein (1) the average circularity of the toner is at least 0.960; (2) the fixing ratio of the external additive on the toner particle is from 75% to 100%; and (3) in a differential curve obtained by the differentiation, by load, of a load-displacement curve where the horizontal axis is load (mN) and the vertical axis is displacement (?m), the load-displacement curve being provided by measurement of the strength of the toner by a nanoindentation procedure, a load A that provides a maximum value in the differential curve in a load region from 0.20 mN to 2.30 mN is from 1.15 mN to 1.50 mN.
    Type: Grant
    Filed: July 27, 2018
    Date of Patent: September 22, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Daisuke Yoshiba, Shohei Tsuda, Mariko Yamashita, Kozue Uratani, Ryo Nagata
  • Publication number: 20200166861
    Abstract: A toner comprising a toner particle including a binder resin and a colorant and an external additive, wherein the external additive contains an external additive A having a Feret diameter of 60 to 200 nm, the external additive A is inorganic fine particles or organic-inorganic composite fine particles, adhesion index of the external additive A to the toner is 0.00 to 3.00, and penetration depth b and protrusion height c satisfy Relational expressions (1) and (2) below, where b (nm) denotes penetration depth of the external additive A, at a portion of the external additive A penetrating into the toner particle interior from the surface thereof, and c (nm) denotes a protrusion height of the external additive A at that portion, in an observation of an image resulting from image processing of a cross section of the toner using TEM; 60?b+c?200??(1), 0.15?b/(b+c)?0.30??(2).
    Type: Application
    Filed: January 30, 2020
    Publication date: May 28, 2020
    Inventors: Kozue Uratani, Daisuke Yoshiba, Shohei Tsuda, Tomoya Nagaoka, Mariko Yamashita, Kazuki Kaneko, Ryo Nagata
  • Publication number: 20200091304
    Abstract: A semiconductor device includes a semiconductor portion of a first conductivity type, an insulating portion provided in an upper layer portion of the semiconductor portion, a source region, a drain region and a gate electrode. The insulating portion surrounds an active area. The source region and the drain region are provided inside the active area and separated from each other along a first direction parallel to an upper surface of the semiconductor portion. The source region and the drain region are of a second conductivity type. The gate electrode is provided above the semiconductor portion. The gate electrode is disposed in a region directly above a region between the source region and the drain region, and disposed in a region directly above an end portion in a second direction of the active area. The second direction is orthogonal to the first direction.
    Type: Application
    Filed: February 26, 2019
    Publication date: March 19, 2020
    Inventors: Mariko Yamashita, Tomoko Kinoshita, Keita Takahashi, Kanako Komatsu
  • Patent number: 10578990
    Abstract: A toner comprising a toner particle that contains a binder resin and a colorant, wherein (1) an average circularity of the toner is at least 0.960, (2) an onset temperature T? (° C.) of a storage elastic modulus E? of the toner, as determined by a powder dynamic viscoelastic measurement, is from 50° C. to 70° C., and (3) in a differential curve obtained by differentiation, by load, of a load-displacement curve provided by measurement of the strength of the toner by a nanoindentation procedure, with the horizontal axis being load (mN) and the vertical axis being displacement (?m), the load X that provides the maximum value in the differential curve in the load region from 0.20 mN to 2.30 mN is from 1.00 mN to 1.50 mN.
    Type: Grant
    Filed: July 24, 2018
    Date of Patent: March 3, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Shohei Tsuda, Daisuke Yoshiba, Kozue Uratani, Mariko Yamashita
  • Publication number: 20190041763
    Abstract: A toner comprising a toner particle that contains a binder resin and a colorant, wherein (1) an average circularity of the toner is at least 0.960, (2) an onset temperature T? (° C.) of a storage elastic modulus E? of the toner, as determined by a powder dynamic viscoelastic measurement, is from 50° C. to 70° C., and (3) in a differential curve obtained by differentiation, by load, of a load-displacement curve provided by measurement of the strength of the toner by a nanoindentation procedure, with the horizontal axis being load (mN) and the vertical axis being displacement (?m), the load X that provides the maximum value in the differential curve in the load region from 0.20 mN to 2.30 mN is from 1.00 mN to 1.50 mN.
    Type: Application
    Filed: July 24, 2018
    Publication date: February 7, 2019
    Inventors: Shohei Tsuda, Daisuke Yoshiba, Kozue Uratani, Mariko Yamashita
  • Publication number: 20190041762
    Abstract: A toner comprising: a toner particle that contains a binder resin and a colorant: and an external additive, wherein (1) the average circularity of the toner is at least 0.960; (2) the fixing ratio of the external additive on the toner particle is from 75% to 100%; and (3) in a differential curve obtained by the differentiation, by load, of a load-displacement curve where the horizontal axis is load (mN) and the vertical axis is displacement (?m), the load-displacement curve being provided by measurement of the strength of the toner by a nanoindentation procedure, a load A that provides a maximum value in the differential curve in a load region from 0.20 mN to 2.30 mN is from 1.15 mN to 1.50 mN.
    Type: Application
    Filed: July 27, 2018
    Publication date: February 7, 2019
    Inventors: Daisuke Yoshiba, Shohei Tsuda, Mariko Yamashita, Kozue Uratani, Ryo Nagata
  • Patent number: 9333123
    Abstract: A wearing article includes front and rear side edges respectively joined by seam arrays extending in a longitudinal direction Y, a waist-opening, and a pair of leg-openings. The wearing article further includes an inner sheet, an outer sheet and a liquid-absorbent core sandwiched between these inner and outer sheets. The inner and outer sheets are formed of heat-sealable fibrous nonwoven fabrics containing thermoplastic synthetic resins. Each of the seam arrays of the diaper includes a plurality of seam-welded regions and a seam-nonwelded region left behind in the seam array. In the seam array, the seam-welded regions arranged so as to be aligned in longitudinal and transverse directions, each substantially shaped in a square, partially lack at a position differentiated for every one of specified patterns.
    Type: Grant
    Filed: February 10, 2011
    Date of Patent: May 10, 2016
    Assignee: UNICHARM CORPORATION
    Inventors: Toshifumi Otsubo, Tatsuya Hashimoto, Mariko Yamashita, Taishi Nakamura
  • Patent number: 9283125
    Abstract: In a disposable wearing article, a first waist region is elasticized and formed of an inner sheet and an outer sheet. The non-skin-facing side of the outer sheet is formed substantially over its entire area with a plurality of thermocompression-bonded spots regularly and intermittently arranged at predetermined intervals. The outer sheet has non-thermocompressed regions surrounded by a plurality of thermocompression-bonded spots. A fibrous layer lying at least on the outer surface of said outer sheet is formed of thermal adhesive crimped fibers which are bonded together by thermocompression-bonding treatment in the thermocompression-bonded spots. The outer sheet and the inner sheet are bonded to each other by adhesive applied on at least one of respective opposite surfaces thereof so that the crimped fibers in the non-thermocompressed regions may protrude outward in a thickness direction of the outer sheet as the inner sheet contracts in the direction of the transverse axis Q.
    Type: Grant
    Filed: August 31, 2010
    Date of Patent: March 15, 2016
    Assignee: UNICHARM CORPORATION
    Inventors: Toshifumi Otsubo, Tatsuya Hashimoto, Mariko Yamashita, Etsuko Kudo
  • Patent number: 9220643
    Abstract: A disposable wearing article includes, in an elastic region in a periphery of at least a waist- or leg-opening, an elastic band formed of a fibrous non-woven fabric which is elastically contractible and has a plurality of first gathers extending in a length direction so as to undulate in a width direction thereof.
    Type: Grant
    Filed: March 30, 2010
    Date of Patent: December 29, 2015
    Assignee: UNICHARM CORPORATION
    Inventors: Mariko Yamashita, Toshifumi Otsubo, Tatsuya Hashimoto, Shinichi Ishikawa, Jun Okuda
  • Patent number: 9173781
    Abstract: A disposable wearing article includes a front side edges lying in a front waist region, rear side edges lying in a rear waist region and crotch side edges lying in a crotch region. A chassis of the diaper includes a first backsheet forming the front waist region and a part of the crotch region and a second backsheet forming the rear waist region and a part of the crotch region. The front and rear waist regions are provided with first front and rear waist elastic yarns or threads and front and rear region elastic sheets, and the crotch region is provided along the crotch side edges with front and rear leg elastic elements. Ends of front leg elastic elements on one side overlap the front side edges. Ends of the rear leg elastic elements on one side overlap the rear side edges.
    Type: Grant
    Filed: January 6, 2011
    Date of Patent: November 3, 2015
    Assignee: UNICHARM CORPORATION
    Inventors: Toshifumi Otsubo, Tatsuya Hashimoto, Mariko Yamashita, Etsuko Kudo, Akiko Tange
  • Patent number: 9078788
    Abstract: The present invention provides a disposable wearing article having a position indicator mark formed on a crotch member and overlapped by front and rear waist members. Front and rear waist members overlap front and rear ends, respectively, of a crotch member and are bonded thereto to define first and second overlapping regions and an intermediate region extending between these first and second overlapping regions. A position indicator mark is formed in the first overlapping region, a graphic of fish is portrayed as a crotch graphic element in the second overlapping region and graphics of fish are portrayed in the intermediate region as crotch graphic elements. In the first overlapping region, a front waist sheet of the front waist member overlaps a front graphic film on which a graphic of penguin is portrayed as a front graphic element which, in turn, overlaps the position indicator mark.
    Type: Grant
    Filed: January 17, 2011
    Date of Patent: July 14, 2015
    Assignee: UNICHARM CORPORATION
    Inventors: Toshifumi Otsubo, Tatsuya Hashimoto, Mariko Yamashita
  • Patent number: 8961488
    Abstract: A wearing article has a chassis and leg elastic members of a flat band shape that are attached to the chassis along leg side edges thereof. The chassis has regions each of which overlaps one of the leg elastic members and includes at least one series of depressions extending along the respective leg side edge.
    Type: Grant
    Filed: March 31, 2010
    Date of Patent: February 24, 2015
    Assignee: Uni-Charm Corporation
    Inventors: Toshifumi Otsubo, Tatsuya Hashimoto, Mariko Yamashita
  • Patent number: 8864734
    Abstract: The present invention provides a disposable pants-type wearing article free from possibility that upper regions of the leg-openings' peripheral edges might be formed with frills even when the belt-like leg elastic members contract along the peripheral edges of the respective leg-openings. Belt-like leg elastic members in a disposable pants-type diaper each has inner and outer surfaces at least one of which is bonded to sheet-like members included in put flat and joined together regions and a crotch region of the diaper. The belt-like leg elastic members extend from the respective put flat and joined regions along leg-openings' peripheral edges. Over ranges in which the belt-like leg elastic members extend along the respective peripheral edges the sheet-like members also extend along the peripheral edges.
    Type: Grant
    Filed: January 21, 2011
    Date of Patent: October 21, 2014
    Assignee: Unicharm Corporation
    Inventors: Toshifumi Otsubo, Tatsuya Hashimoto, Mariko Yamashita
  • Patent number: 8821469
    Abstract: A disposable pants-type wearing article includes belt-shaped leg elastic members. Respective opposite side edges of front and rear waist regions of the article are fusion-bonded together to define joined regions. The belt-shaped leg elastic members respectively have front side upper ends lying in the front waist region and included by the put flat and joined together regions and rear side upper ends lying in the rear waist region and included by the put flat and joined together regions. In the joined regions, lower edges of the upper ends and lower edges of the rear side upper ends are displaced one from another in such a manner that the one pair of the lower edges lies below the other pair of the lower edges.
    Type: Grant
    Filed: January 21, 2011
    Date of Patent: September 2, 2014
    Assignee: Unicharm Corporation
    Inventors: Toshifumi Otsubo, Tatsuya Hashimoto, Mariko Yamashita
  • Publication number: 20120296294
    Abstract: The present invention to provide an absorbent structure adapted to prevent the liquid-absorbent materials from falling off the wrapping sheets. An aggregate of liquid-absorbent materials in an absorbent structure has an inner surface covered with a first wrapping sheet and an outer surface and lateral surfaces covered with a second wrapping sheet. The first wrapping sheet and the second wrapping sheet respectively have first extended portions lying outboard of the lateral surfaces and second extended portions wherein the first extended portions and the second extended portions are put flat and bonded together to form laminated regions. The laminated regions cover the lateral surfaces of the aggregate and part of the outer surface which, in turn, covers these lateral surfaces and the outer surface.
    Type: Application
    Filed: February 16, 2011
    Publication date: November 22, 2012
    Applicant: UNICHARM CORPORATION
    Inventors: Tatsuya Hashimoto, Toshifumi Otsubo, Mariko Yamashita