Patents by Inventor Hitoshi Yamamoto

Hitoshi Yamamoto 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: 20150236277
    Abstract: Compounds having the formula M(LA)x(LB)y(LC)z, devices containing the same, and formulations containing the same are described. The compounds include: where M is a metal having an atomic number greater than 40; x is 1, or 2; y is 1, or 2; and z is 0, 1, or 2; where x+y+z is the oxidation state of the metal M, where X1, X2, X3, and X4 are C or N; where at least one of R1, R2, R3, and R4 has at least two C atoms; where RB represents di, tri, or tetra-substitution, and where two adjacent RB for a six-member carbocyclic or heterocyclic ring E fused to ring B; where, when ring E is heterocyclic, the only heteroatom is nitrogen; where ring E can be further substituted; and where (a) at least one of X1, X2, X3, and X4 is N, (b) ring E is heterocylic, or (c) both.
    Type: Application
    Filed: February 18, 2014
    Publication date: August 20, 2015
    Applicant: Universal Display Corporation
    Inventors: Pierre-Luc T. BOUDREAULT, Alexey Borisovich DYATKIN, Chuanjun XIA, Hitoshi YAMAMOTO
  • Patent number: 9079434
    Abstract: A circuit board unit which is attached to the cartridge includes a circuit board on which an electronic component is mounted, a first member having a surface opposing the circuit board, and a second member which is bonded to a region of the surface of the first member which region is different from the region of the surface opposing the circuit board. The circuit board is not fixed to the first member and the second member and is retained between the first member and the second member with gaps extending in an orthogonal direction orthogonal to the surface and in a surface direction in parallel to the surface.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: July 14, 2015
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Masataka Kamiya, Noritsugu Ito, Hitoshi Yamamoto
  • Publication number: 20150194622
    Abstract: The organic electroluminescence device utilizes a novel combination of a biscarbazole derivative compound as a phospherescent host materials and an orgaphosphorescent material as a red phosphorescent dopant material in the light emitting region of the device, where the biscarbazole derivative compound is represented by a formula (1); wherein the red phosphorescent dopant material is a phosphorescent organometallic complex having a substituted chemical structure represented by one of the partial chemical structures represented by a formulas (D1), (D2) and (D3).
    Type: Application
    Filed: June 14, 2012
    Publication date: July 9, 2015
    Applicants: UNIVERSAL DISPLAY CORPORATION
    Inventors: Hitoshi Yamamoto, Michael S. Weaver, Julia J. Brown, Kazuki Nishimura, Toshihiro Iwakuma
  • Publication number: 20150194621
    Abstract: An organic electroluminescence device utilizes a novel combination of one or more biscarbazole derivative compounds as the phosphorescent host material in combination with an organometallic phosphorescent material as a dopant in the light emitting region of the device, where the biscarbazole derivative compounds are represented by a formula (1A) or (2A) below: (1A), (2A) where A1 represents a substituted or unsubstituted nitrogen-containing heterocyclic group having 1 to 30 ring carbon atoms; A2 represents a substituted or unsubstituted aromatic hydrocarbon group having 6 to 30 ring carbon atoms, or substituted or unsubstituted nitrogen-containing heterocyclic group having 1 to 30 ring carbon atoms; Xi and X2 each are a linking group; Y1 to Y4 each represent a substituent; p and q represent an integer of 1 to 4; and r and s represent an integer of 1 to 3; and the organometallic phosphorescent material is a compound having a substituted chemical structure represented by the formula (4A): where each R is indepe
    Type: Application
    Filed: May 17, 2012
    Publication date: July 9, 2015
    Applicants: Universal Display Corporation, Idemitsu Kosan Co., Ltd.
    Inventors: Kazuki Nishimura, Toshihiro Iwakuma, Hitoshi Yamamoto, Michael S. Weaver, Julia J. Brown
  • Patent number: 9054343
    Abstract: A method of fabricating a first device includes providing a first container that contains, in a desired proportion, a first organic emitting material having a first peak wavelength, a second organic emitting material having a second peak wavelength; providing a substrate having a first electrode disposed thereon; depositing an emissive layer over the first electrode, wherein the first container is a source of material for depositing, and wherein the emissive layer has a homogeneous composition and comprises the first and second organic emitting materials in the desired proportion; depositing a second electrode over the first emissive layer, and wherein the second peak wavelength is between 0 and 40 nm greater than the first peak wavelength.
    Type: Grant
    Filed: January 9, 2014
    Date of Patent: June 9, 2015
    Assignee: Universal Display Corporation
    Inventors: Vadim Adamovich, Hitoshi Yamamoto, Michael S. Weaver
  • Patent number: 9043209
    Abstract: This device 301 stores a first content-specific language model representing a probability that a specific word appears in a word sequence representing a first content, and a second content-specific language model representing a probability that the specific word appears in a word sequence representing a second content. Based on a first probability parameter representing a probability that a content represented by a target word sequence included in a speech recognition hypothesis generated by a speech recognition process of recognizing a word sequence corresponding to a speech, a second probability parameter representing a probability that the content represented by the target word sequence is a second content, the first content-specific language model and the second content-specific language model, the device creates a language model representing a probability that the specific word appears in a word sequence corresponding to a part corresponding to the target word sequence of the speech.
    Type: Grant
    Filed: September 3, 2009
    Date of Patent: May 26, 2015
    Assignee: NEC CORPORATION
    Inventors: Hitoshi Yamamoto, Ken Hanazawa, Kiyokazu Miki
  • Publication number: 20150139710
    Abstract: A protective layer forming device, including: a powdery image bearer protecting agent formed of a granulated product containing a fatty acid metal salt and an inorganic lubricant; and a roller-shaped protecting agent supplying member configured to supply the powdery image bearer protecting agent to a surface of an image bearer.
    Type: Application
    Filed: November 13, 2014
    Publication date: May 21, 2015
    Applicant: Ricoh Company, Ltd.
    Inventors: Kunio HASEGAWA, Hiroshi NAKAI, Kenji KOMITO, Tadashi KASAI, Takamasa OZEKI, Jun HITOSUGI, Makoto YASUDA, Emiko SHIRAISHI, Wakana ITOH, Takatsugu KOMORI, Mutsuki MORINAGA, Hitoshi YAMAMOTO
  • Patent number: 9009513
    Abstract: Timers #0 through #3 are each supplied with a period for prohibiting a change in a power supply voltage. An OS #A or an OS #B determines necessity to change an operating frequency for a CPU core corresponding to any of the timers #0 through #3 when the timer exceeds the prohibition period. It is determined whether it is necessary to change a power supply voltage supplied to CPU cores #0 through #3 when the OS #A or the OS #B determines necessity to change an operating frequency. When it is determined that a power supply voltage needs to be changed, a power supply voltage change portion 20 changes the power supply voltage supplied to the CPU cores #0 through #3. Therefore, it is possible to improve the processing efficiency without needing to acquire inter-OS lock.
    Type: Grant
    Filed: January 31, 2012
    Date of Patent: April 14, 2015
    Assignee: Renesas Electronics Corporation
    Inventors: Hitoshi Yamamoto, Akio Idehara, Yasuhiro Tawara
  • Publication number: 20150053938
    Abstract: A composition formed of a first mixture of a first compound and a second compound wherein the first compound has different chemical structure than the second compound; the first compound is capable of functioning as a hole transporting material in an organic light emitting device at room temperature; the first compound comprises at least one carbazole group; the first compound has a evaporation temperature T1 of 150 to 350° C.; the second compound has evaporation temperature T2 of 150 to 350° C.; the absolute value of T1?T2 is less than 20° C.; the first compound having a concentration C1 in said first mixture, and the first compound having a concentration C2 in a film formed by evaporating the first mixture in a vacuum deposition tool at a constant pressure between 1×10?6 Torr to 1×10?9 Torr, at a 2 ?/sec deposition rate on a surface positioned at a predefined distance away from the mixture being evaporated; and wherein the absolute value of (C1?C2)/C1 is less than 5%.
    Type: Application
    Filed: April 15, 2014
    Publication date: February 26, 2015
    Applicant: Universal Display Corporation
    Inventors: Lichang ZENG, Vadim ADAMOVICH, Ting-Chih WANG, Chuanjun XIA, Michael S. WEAVER, Hitoshi YAMAMOTO, Bert ALLEYNE
  • Publication number: 20150053939
    Abstract: A composition formed of a mixture of two compounds having similar thermal evaporation properties that are pre-mixed into an evaporation source that can be used to co-evaporate the two compounds into an emission layer in OLEDs via vacuum thermal evaporation process is disclosed.
    Type: Application
    Filed: April 15, 2014
    Publication date: February 26, 2015
    Applicant: Universal Display Corporation
    Inventors: Vadim ADAMOVICH, Hitoshi YAMAMOTO, Ting-Chih WANG, Michael S. WEAVER, Chuanjun XIA, Bert ALLEYNE, Pierre-Luc T. BOUDREAULT, Alexey Borisovich DYATKIN, Scott JOSEPH
  • Publication number: 20150050033
    Abstract: An image forming apparatus includes a plurality of image forming stations, each including a developing device, a toner container containing a colored or special toner, and a replaceable supply-toner conduit extending from the toner container to the developing device; and a toner type identifier to identify a type of toner used in the supply-toner conduit of each of the plurality of image forming stations.
    Type: Application
    Filed: July 8, 2014
    Publication date: February 19, 2015
    Inventors: Tadashi KASAI, Makoto Yasuda, Mutsuki Morinaga, Hitoshi Yamamoto, Emiko Shiraishi, Yuichi Aizawa
  • Publication number: 20150037049
    Abstract: An image forming apparatus includes a plurality of image bearing members, replaceable development units, replaceable toner replenishing members, toner supply units, and a control unit. The development units are each provided for a corresponding one of the plurality of image bearing members. The toner replenishing members are each provided for a corresponding one of the development units. The toner supply units are arranged between the respective toner replenishing members and the development units. The control unit causes the image forming apparatus to execute a toner supply unit cleaning mode to convey a last-used toner inside the toner supply unit into the development unit which is last used and to be replaced to empty the toner supply unit, when replacement of the development unit and the corresponding toner replenishing member is designated to use a toner of a type different from the last-used toner.
    Type: Application
    Filed: July 8, 2014
    Publication date: February 5, 2015
    Inventors: Emiko SHIRAISHI, Tadashi Kasai, Makoto Yasuda, Yuichi Aizawa, Mutsuki Morinaga, Hitoshi Yamamoto
  • Patent number: 8941099
    Abstract: The present invention provides an OLED in which an organic thin film layer comprising a single layer or plural layers between a cathode and an anode, wherein the organic thin film layer comprises at least one organic light emitting layer, wherein at least one light emitting layer comprises at least one host material and at least one phosphorescent emitter material, wherein the host material comprises a substituted or unsubstituted hydrocarbon compound having the chemical structure represented by the formula (A-I): formula (A-1) wherein R1 and R2 each represent independently a substituted or unsubstituted alkyl group having from 1 to about 5 carbon atoms; Ar1 represents a divalent residue of a benzene ring, a naphthalene ring, a chrysene ring, a phenanthrene ring, a benzophenanthrene ring, a dibenzophenanthrene ring, a benzo[a]triphenylene ring, a benzochrysene ring, a fluoranthene ring, a benzo[b]fluoranthene ring or picene ring; and Ar2 represents a monovalent residue of a naphthalene ring, a chrysene ring,
    Type: Grant
    Filed: July 7, 2010
    Date of Patent: January 27, 2015
    Assignees: Universal Display Corporation, Idemitsu Kosan Co., Ltd.
    Inventors: Hitoshi Yamamoto, Michael S. Weaver, Julia J. Brown, Kazuki Nishimura, Toshihiro Iwakuma, Chishio Hosokawa, Toshinari Ogiwara
  • Publication number: 20150010337
    Abstract: An image forming apparatus includes a color toner image forming device, a fixing device, a cooling device, a colorless toner image forming device, and a control device. The color toner image forming device forms a toner image on a recording medium with a color toner. The fixing device heats the toner image on the recording medium to fix the toner image on the recording medium. The cooling device cools the fixed toner image. The colorless toner image forming device forms a toner image on the recording medium with a colorless toner having a storage elastic modulus of 100 or less and a loss tangent of 10 or greater at a heating temperature of the fixing device. The control device controls cooling power of the cooling device based on whether or not the colorless toner image forming device forms the toner image.
    Type: Application
    Filed: June 25, 2014
    Publication date: January 8, 2015
    Inventors: Mutsuki MORINAGA, Tadashi Kasai, Masato Iio, Makoto Yasuda, Yuichi Aizawa, Hitoshi Yamamoto
  • Publication number: 20150001471
    Abstract: The present disclosure generally relates to novel compounds containing carbazole and triazine with different number of phenyl units attached to its core. In particular, the disclosure relates to compositions and/or devices comprising these compounds as hosts for PHOLEDs.
    Type: Application
    Filed: June 28, 2013
    Publication date: January 1, 2015
    Inventors: Pierre-Luc T. Boudreault, Alexey Dyatkin, Chuanjun Xia, Hitoshi Yamamoto
  • Publication number: 20150001472
    Abstract: A compound having an ancillary ligand L1 having the formula: Formula I is disclosed. The ligand L1 is coordinated to a metal M having an atomic number greater than 40, and two adjacent substituents are optionally joined to form into a ring. Such compound is suitable for use as emitters in organic light emitting devices.
    Type: Application
    Filed: July 1, 2013
    Publication date: January 1, 2015
    Inventors: Pierre-Luc T. Boudreault, Alexey Dyatkin, David Zenan Li, Scott Joseph, Chuanjun Xia, Hitoshi Yamamoto, Michael S. Weaver, Bert Alleyne, James Fiordeliso
  • Publication number: 20140374728
    Abstract: An improved OLED includes an emissive layer disposed between a cathode and an anode where the emissive layer includes a multi-component host material and a phosphorescent emitter material.
    Type: Application
    Filed: January 23, 2013
    Publication date: December 25, 2014
    Applicant: Universal Display Corporation
    Inventors: Vadim Adamovich, Hitoshi Yamamoto, Michael S. Weaver, Norimasa Yokoyama, Makoto Nagaoka, Naoaki Kabasawa
  • Publication number: 20140339518
    Abstract: An improved OLED includes an emitter layer disposed between a cathode and an anode where the emitter layer includes a host material and a phosphorescent emitter material. A first hole transport layer is disposed between the emitter layer and the anode and a second hole transport layer is disposed between the first hole transport layer and the anode. The first hole transport layer includes a first hole transport material that is a carbazole type compound and the second hole transport layer includes a second hole transport material that is different from the first hole transport material. The phosphorescent emitter material includes a phosphorescent organometallic compound that is a heteroleptic compound represented by the formula L2MX, LL?MX, LL?L?M, or LMXX?, wherein L, L?, L?, X, and X? are inequivalent, bidentate ligands and M is a metal that forms octahedral complexes, wherein L, L?, and L? are monoanionic inequivalent bidentate ligands coordinated to M through an sp2 hybridized carbon and a heteroatom.
    Type: Application
    Filed: August 5, 2011
    Publication date: November 20, 2014
    Applicants: HODOGAYA CHEMICAL CO., LTD., UNIVERSAL DISPLAY CORPORATION
    Inventors: Hitoshi Yamamoto, Michael Stewart Weaver, Norimasa Yokoyama, Makoto Nagaoka, Naoaki Kabasawa
  • Publication number: 20140318681
    Abstract: When overlapping and joining together end portions of a rubber member, it becomes possible to join them at a joining area smaller than a conventional one by increasing the joining area. There is provided a joining device for overlapping end portions, of a rubber member (tire constituent member) with one upper end portion placing on the other lower end portion and joining the end portions of the rubber member, in which a pressing roll (disk-shaped roll) rotating about an inclined shaft is rolled while being pressed against the overlapped upper end portion of the rubber member, and the upper end portion is extended by a shearing force generated at this time to increase a joining area between the both end portions.
    Type: Application
    Filed: November 15, 2012
    Publication date: October 30, 2014
    Inventor: Hitoshi Yamamoto
  • Patent number: 8817361
    Abstract: An electrophoretic particle includes a core particle and a coating layer covering at least one portion of the core particle. The coating layer contains a polymer and a silane coupling agent containing a nonionic charged group attached to the surface of the core particle. The polymer contains a silane coupling agent containing a polymerizable group attached to the surface of the core particle and a polymerization site formed by polymerizing a monomer using the polymerizable group as a starting point.
    Type: Grant
    Filed: January 23, 2013
    Date of Patent: August 26, 2014
    Assignee: Seiko Epson Corporation
    Inventor: Hitoshi Yamamoto