Patents by Inventor Masato Igarashi

Masato Igarashi 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: 6255028
    Abstract: An electrophotographic toner including a colorant and a binder resin including at least a styrene resin, wherein the toner further includes one or more styrene oligomers in an amount not greater than 100 ppm. An electrophotographic image forming method is also disclosed in which an electrostatic latent image formed on an image bearing member is developed with the toner.
    Type: Grant
    Filed: January 31, 2000
    Date of Patent: July 3, 2001
    Assignee: Ricoh Company, Ltd.
    Inventors: Kumi Hasegawa, Shinichi Kuramoto, Hiroshi Yamashita, Masato Igarashi, Nobutaka Kinoshita, Kohsuke Suzuki
  • Patent number: 6231652
    Abstract: An aqueous ink composition contains a colorant and a humectant, and has a surface tension &ggr; of less than 50 mN/m when measured by a maximum bubble pressure method at 25° C., with a bubble frequency &ngr; of the aqueous ink composition being set at less than 1 Hz, and a surface tension &ggr; of more than 40 mN/m when measured by the maximum bubble pressure method at 25° C., with the bubble frequency &ngr; of the aqueous ink composition being set at more than 5 Hz. In addition, an ink-jet printing method for forming ink images on an image-receiving medium has the step of ejecting the above-mentioned aqueous ink composition in the form of droplets according to the recording signals at a recording frequency of 8 kHz or more.
    Type: Grant
    Filed: August 4, 1999
    Date of Patent: May 15, 2001
    Assignee: Ricoh Company, Ltd.
    Inventors: Masayuki Koyano, Ikuko Yamada, Akio Kojima, Kiyofumi Nagai, Masato Igarashi, Akiko Konishi, Hiroyuki Mochizuki, Takanori Tsuyuki
  • Patent number: 6131109
    Abstract: The debug assisting apparatus comprises a task information recording device to record the execution information of task A, task B, and task C executed by the OS 1 in multitask processing, an object execution information recording device to record the information of the objects operated by the tasks, an information merging device both to chronologically merge the recorded object execution information and execution information of task A, task B, and task C and to store such information as the program operation history in a history storing device, and an output data generating device to generate the output data showing the execution progress of task A, task B, and task C and the operation of the objects in association according to the operation history table in the history storing device and output such data to the input/output device (monitor).
    Type: Grant
    Filed: February 24, 1998
    Date of Patent: October 10, 2000
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Katsuhiko Ueki, Masato Igarashi, Takeshi Yasuda, Noriaki Koyama, Masaaki Okajima, Ikuya Odahara
  • Patent number: 6120589
    Abstract: A set of color ink compositions for ink-jet printing includes yellow, magenta and cyan ink composition, each of which having water, a water-soluble coloring agent, a wetting agent, a surfactant and an antiseptic and mildewproofing agent, and the yellow ink composition has the lightness index L* of 95.+-.5 and the chromaticness indices a* and b* of respectively -6.+-.5 and 23 .+-.12, the magenta ink composition has the lightness index L* of 75.+-.5 and the chromaticness indices a* and b* of respectively 55.+-.25 and -28.+-.10, and the cyan ink composition has the lightness index L* of 87.+-.5 and the chromaticness indices a* and b* of respectively -35.+-.10 and -19.+-.8.
    Type: Grant
    Filed: February 19, 1999
    Date of Patent: September 19, 2000
    Assignee: Ricoh Company, Ltd.
    Inventors: Akiko Bannai, Akio Kojima, Kiyofumi Nagai, Masato Igarashi, Masayuki Koyano, Hiroyuki Mochizuki, Takanori Tsuyuki, Ikuko Tanaka
  • Patent number: 5993524
    Abstract: An image recording method for forming an image on a recording material, using a recording liquid which contains a coloring agent and a solvent in which the coloring agent is dispersed or dissolved, includes the steps of applying to a recording material a colorless or light colored image recording acceleration liquid containing a surfactant and a viscosity-increasing compound capable of increasing the viscosity of the recording liquid, and depositing the recording liquid imagewise on the recording material by ejecting the recording liquid in the form of droplets onto the recording material, and an image recording apparatus for carrying out the above image recording method is provided.
    Type: Grant
    Filed: September 4, 1998
    Date of Patent: November 30, 1999
    Assignee: Ricoh Company, Ltd.
    Inventors: Kiyofumi Nagai, Akio Kojima, Masato Igarashi, Akiko Bannai, Hiroyuki Mochizuki, Takanori Tsuyuki, Ikuko Tanaka, Masayuki Koyano
  • Patent number: 5972082
    Abstract: An aqueous ink composition contains a colorant and a humectant, and has a surface tension .gamma. of less than 50 mN/m when measured by a maximum bubble pressure method at 25.degree. C., with a bubble frequency .nu. of the aqueous ink composition being set at less than 1 Hz, and a surface tension .gamma. of more than 40 mN/m when measured by the maximum bubble pressure method at 25.degree. C., with the bubble frequency .nu. of the aqueous ink composition being set at more than 5 Hz. In addition, an ink-jet printing method for forming ink images on an image-receiving medium has the step of ejecting the above-mentioned aqueous ink composition in the form of droplets according to the recording signals at a recording frequency of 8 kHz or more.
    Type: Grant
    Filed: April 29, 1997
    Date of Patent: October 26, 1999
    Assignee: Ricoh Company, Ltd.
    Inventors: Masayuki Koyano, Ikuko Yamada, Akio Kojima, Kiyofumi Nagai, Masato Igarashi, Akiko Konishi, Hiroyuki Mochizuki, Takanori Tsuyuki
  • Patent number: 5882390
    Abstract: A recording ink composition contains a colorant which is soluble or dispersible in water and includes at least one phthalocyanine compound of formula (1) which may have a halogen atom as a substituent and at least one of phthalocyanine compounds of formulas (2) and (3); a dispersant which includes at least one polymeric compound having a hydrophilic moiety and a hydrophobic moiety, and/or at least one surfactant having an alkyl group having 5 or more carbon atoms; water; and a humectant. In addition, images with a resolution of 10 dots/mm.times.10 dots/mm or more can be recorded on an image receiving medium by ejecting the above-mentioned recording ink composition in the form of droplets by the application of thermal or mechanical energy thereto onto an image receiving medium with a Stockigt size degree of 3 seconds or more, with the recording ink composition being deposited in an amount of 20 pl/mm.sup.2 to 200 pl/mm.sup.2 on the image receiving medium.
    Type: Grant
    Filed: July 24, 1997
    Date of Patent: March 16, 1999
    Assignee: Ricoh Company, Ltd
    Inventors: Kiyofumi Nagai, Akio Kojima, Masato Igarashi, Akiko Konishi, Hiroyuki Mochizuki, Takanori Tsuyuki, Masayuki Koyano, Ikuko Tanaka
  • Patent number: 5879439
    Abstract: A recording ink composition includes a colorant comprising a pigment which is soluble or dispersible in water, and a polymeric dye having a weight average molecular weight in a range of 5,000 to 15,000, a dispersant including at least one dispersant component selected from the group consisting of at least one polymeric compound having a hydrophilic moiety and a hydrophobic moiety, and/or at least one surfactant having an alkyl group having 5 or more carbon atoms, water, and a water-soluble organic solvent, and a method of recording images on an image receiving medium is performed, using the recording ink composition.
    Type: Grant
    Filed: August 1, 1997
    Date of Patent: March 9, 1999
    Assignee: Ricoh Company, Ltd.
    Inventors: Kiyofumi Nagai, Akio Kojima, Masato Igarashi, Akiko Konishi, Hiroyuki Mochizuki, Masayuki Koyano, Ikuko Tanaka, Takanori Tsuyuki
  • Patent number: 5845125
    Abstract: A debugger which helps a user perform object-based debugging. A class information generation section (8) generates class information based on the source code. The execution section (12) executes the program. The object information generation section (13) generates object information based on class information and execution information. The user sets a breakpoint in a desired object via the breakpoint setting section (16). A breakpoint may be set at a desired location in the object. The break processing section (18) detects a breakpoint and breaks the execution of the program. The reservation section (21) reserves a debug operation with the identifier of an object. When there is an object that can be referenced by the reserved identifier, the reservation execution section (22) executes the operation reserved for the object.
    Type: Grant
    Filed: February 10, 1997
    Date of Patent: December 1, 1998
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Tomoko Nishimura, Masato Igarashi, Noriaki Koyama, Katsuhiko Ueki
  • Patent number: 5738759
    Abstract: A recording material including paper containing cellulose fibers as the main component, with the elongation percentage of the paper in the cross direction thereof when immersed in water at 20.degree. C. for 1 minute being 1.8 % or less, is produced and recycled. In addition, paper containing cellulose fibers, with the same elongation percentage as mentioned above in the machine direction thereof is also provided.
    Type: Grant
    Filed: October 2, 1995
    Date of Patent: April 14, 1998
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroshi Kitazawa, Shigeaki Kimura, Eiichi Kawamura, Toshiyuki Kawanishi, Masato Igarashi
  • Patent number: 5607534
    Abstract: A method of recycling a support material for supporting images thereon, at least part of the support material including a paper layer which contains cellulose fibers as the main component and bears thereon hydrophobic images having a coloring agent and a heat softening or thermofusible material, includes the steps of causing the support material to hold a water-containing image peeling liquid thereon; bringing an image peeling member into contact with the hydrophobic images while the image peeling liquid is held on the support material; and peeling the hydrophobic images off the paper layer, with the image peeling liquid being held in an amount of 1.0 g or more per A4-size paper layer, or with the rate of the penetration of the image peeling liquid into the paper layer of the support material being set at 12 ml/m.sup.2 or more for a contact time of 0.
    Type: Grant
    Filed: August 22, 1994
    Date of Patent: March 4, 1997
    Assignee: Ricoh Company, Ltd.
    Inventors: Toshiyuki Kawanishi, Masato Igarashi, Eiichi Kawamura, Tadashi Saitoh, Kiyoshi Tanikawa, Kakuji Murakami
  • Patent number: 5540815
    Abstract: A method of recycling a copy sheet carrying a hydrophobic image thereon by impregnating the sheet with a water-containing separating liquid, causing the to image contact an image separating member, and heating the sheet for thereby transferring the image to the image separating member. The image separating member has a critical surface tension of 25 mN/m or above.
    Type: Grant
    Filed: December 9, 1994
    Date of Patent: July 30, 1996
    Assignee: Ricoh Company, Ltd.
    Inventors: Masato Igarashi, Toshiyuki Kawanishi, Eiichi Kawamura, Narihito Kojima
  • Patent number: 5534063
    Abstract: An apparatus capable of surely removing a toner or similar image forming substance stably cohered to a sheet, and an apparatus for processing a sheet are disclosed. A liquid supply unit uniformly supplies a liquid to a toner carried on the sheet. The sheet infiltrated with the liquid is heated by a toner removing unit to have to the toner thereof softened. As a result, the toner adheres to the surface of an offset member implemented as a belt or a drum. The sheet containing the liquid therein is conveyed to the toner removing unit without creasing, breaking or folding.
    Type: Grant
    Filed: July 21, 1994
    Date of Patent: July 9, 1996
    Assignee: Ricoh Company, Ltd.
    Inventors: Tooru Maruyama, Iwao Takahashi, Masatoshi Saito, Shigeru Fujita, Hisao Watanabe, Taro Terashi, Tomoaki Sugawara, Masaru Shinkai, Toshiyuki Kawanishi, Masato Igarashi
  • Patent number: 5347301
    Abstract: A transfer-type electrothermographic recording method comprising the steps of uniformly charging an electrothermographic recording layer which exhibits chargeability A at room temperature and chargeability B above room temperature, where the chargeabilities A and B are in the relationship of A>B.gtoreq.0, forming a latent electrostatic image by applying digital thermal signals which correspond to an original image, developing the latent electrostatic image with a toner of which polarity is the same as or opposite to the polarity of the electric charge of the latent electrostatic image to form a toner image, transferring the toner image to a receiving medium, and fixing the toner image transferred on the receiving medium; and a recording medium for use with the transfer-type electrothermographic recording method, comprising the above electrothermographic recording layer.
    Type: Grant
    Filed: February 22, 1993
    Date of Patent: September 13, 1994
    Assignee: Ricoh Company, Ltd.
    Inventors: Toshiyuki Kawanishi, Kunichika Morohoshi, Masato Igarashi
  • Patent number: 5300952
    Abstract: Image forming equipment for applying heat to a charged image carrier to attenuate part of the potential of the image carrier in order to form a latent image on the image carrier. The surface of a dielectric image carrier is charged by a charger and a thermal print head is driven in response to image information in order to form a latent image on the charged surface of the image carrier. A developing roller applies a liquid developer to the latent image and presses it against the portion where the potential has been lowered. The resulting toner image formed on the image carrier is fixed on a paper sheet fed from a paper feeding device or is directly fixed on the image carrier. The image carrier is formed of polyethylene terephthalate or a mixture of polybutylene terephthalate and silicon dioxide.
    Type: Grant
    Filed: October 25, 1991
    Date of Patent: April 5, 1994
    Assignee: Ricoh Company, Ltd.
    Inventors: Takeo Wada, Makoto Obu, Toshiyuki Kawanishi, Noriyoshi Tarumi, Masato Igarashi, Takashi Mori, Katsuaki Miyawaki, Minoru Suzuki
  • Patent number: 5107282
    Abstract: A transfer-type electrothermographic recording method is disclosed, which comprises the steps of uniformly charging an electrothermographic recording layer to a predetermined polarity, which exhibits chargeability A at room temperature and chargeability B above room temperature, where the chargeabilities A and B are in the relationship of A>B.gtoreq.0; forming a latent electrostatic image on the charged surface of the electrothermographic recording layer by applying thermal signals which correspond to an original image to the side opposite the charged surface of the electrothermographic recording layer; and developing the latent electrostatic image with a toner of which polarity is the same as or opposite to the polarity of the latent electrostatic image to form a toner image. This transfer-type electrothermographic recording method may further comprise a step of transferring the toner image to a receiving medium; and a step of fixing the toner image transferred onto the receiving medium.
    Type: Grant
    Filed: January 28, 1991
    Date of Patent: April 21, 1992
    Assignee: Ricoh Company, Ltd.
    Inventors: Kunichika Morohoshi, Toshiyuki Kawanishi, Masato Igarashi
  • Patent number: 4939062
    Abstract: A non-impact electric image transfer recording method is disclosed, which comprises the steps of applying a recording voltage-signal to a recording medium comprising an electroconductive support and a polymer gel layer containing therein a liquid ink formed on the electroconductive support, thereby causing the liquid ink to ooze from said polymer gel layer, and transferring the liquid ink to a recording sheet to form images thereon, which step may be followed by the step of applying to the polymer gel layer a voltage with an opposite polarity to that of the recording voltage-signal after the transfer of the liquid ink to a recording sheet.
    Type: Grant
    Filed: October 14, 1988
    Date of Patent: July 3, 1990
    Assignee: Ricoh Company, Ltd.
    Inventors: Toshiyuki Kawanishi, Masato Igarashi
  • Patent number: 4791607
    Abstract: A gate array integrated circuit incorporating memories and a method therefore can realize various bit/word constructions according to customer's requests. The gate array integrated circuit of the present invention provides a basic cell array region in which a plurality of basic cells are arranged, a memory cell matrix region in which a plurality of memory cells are arranged, and a plurality of peripheral circuits which include address input circuits and decoders to access the memory cells.
    Type: Grant
    Filed: December 4, 1985
    Date of Patent: December 13, 1988
    Assignee: Fujitsu limited
    Inventors: Masato Igarashi, Yoshiyuki Suehiro