Patents by Inventor Yasuo Yamamoto

Yasuo 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).

  • Patent number: 6550380
    Abstract: A micro porous plastic sheet is stencil plate made by a method for stencil plate making of a stencil sheet for stencil printing under the following conditions: heat is provided to form a negative image with TPH at −30≦Tp−Tm≦300° C. (Tp is heating peak temperature and Tm is melting temperature (melting point) of the sheet) and in 10≦To×100/Ts≦80% (To is current-carrying time period and Ts is current-carrying cycle), micro pores are closed by the pressure for stencil plate making of 0.1≦P≦1.0 MPa, and the thermal shrinkage rate of the sheet measured by TMA is set to 1≦STm-30≦20% (STm-30 is a thermal shrinking rate of the sheet at a temperature 30° C. lower than the melting point TM).
    Type: Grant
    Filed: October 2, 2001
    Date of Patent: April 22, 2003
    Assignee: Riso Kagaku Corporation
    Inventors: Hideyuki Kinoshita, Yasuo Yamamoto
  • Patent number: 6530318
    Abstract: An ink supply roll is disposed inside a printing drum of a stencil printer and supplies ink to the inner peripheral surface of the printing drum. At least the surface layer of the ink supply roll is formed of a nonmetal material which is not larger than 100° in contact angle and not larger than ±5% in swelling ratio to an ultraviolet-curing monomer.
    Type: Grant
    Filed: September 19, 2000
    Date of Patent: March 11, 2003
    Assignee: Riso Kagaku Corporation
    Inventors: Yasuo Yamamoto, Toshihiro Endo
  • Publication number: 20030043335
    Abstract: An image display medium comprising a pair of substrates disposed opposed to each other and a group of at least two kinds of particles enclosed in the gap between the pair of substrates, at least one of the two or more kinds of particles being capable of being positively charged and at least the others being capable of being negatively charged and the particles capable of being positively and negatively charged having different colors, wherein both the particles capable of being positively and negatively charged have a shape factor of from greater than 100 to not greater than 140 as determined by the following equation:
    Type: Application
    Filed: February 25, 2002
    Publication date: March 6, 2003
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yasuo Yamamoto, Satoshi Hiraoka, Kiyoshi Shigehiro, Yoshinori Machida, Takeshi Matsunaga
  • Publication number: 20030022881
    Abstract: An objective of the present invention is to provide carbapenem derivatives which have potent antibiotic activity against MRSA, PRSP, Influenzavirus, and &bgr;-lactamase-producing bacteria and are stable against DHP-1.
    Type: Application
    Filed: July 25, 2002
    Publication date: January 30, 2003
    Inventors: Yuko Kano, Takahisa Maruyama, Yasuo Yamamoto, Eiki Shitara, Toshiro Sasaki, Kazuhiro Aihara, Kunio Atsumi, Katsuyoshi Iwamatsu, Takashi Ida
  • Patent number: 6502506
    Abstract: A stencil printing machine is provided with a paper feed section feeding a print sheet, which is allowed to have paper dusts thereon, in a paper feed path, and a print section to which the print sheet is transferred, and including a printing drum carrying thereon a stencil sheet having a perforated image area formed on the basis of image data and a rotary printing press member located in close proximity to an outer circumferential periphery of the printing drum to impart printing pressure thereto to allow the print sheet to be transferred in press contact between the printing drum and the rotary printing press member such that printing ink is transferred onto the print sheet to generate a desired image thereon through the perforated image area.
    Type: Grant
    Filed: July 19, 2001
    Date of Patent: January 7, 2003
    Assignee: Riso Kagaku Corporation
    Inventors: Toshihiro Endo, Yasuo Yamamoto
  • Publication number: 20020126067
    Abstract: An image display medium capable of displaying an image showing little change of the image density, and also little change of the image density uniformity, and being stable in density contrast, even when repeatedly rewritten over a long period, and an image formation apparatus are provided. The image display medium includes a pair of substrates disposed opposing to each other; and particle groups including at least two types of particles sealed in a space between the pair of the substrates, at least one type thereof having a positively chargeable property, and at least one of others having a negatively chargeable property, and the positively and negatively chargeable types of particles being different colors. The value of a coefficient of variation in each particle size distribution of both the positively and negatively chargeable types of particles is approximately not more than 15%.
    Type: Application
    Filed: November 13, 2001
    Publication date: September 12, 2002
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yasuo Yamamoto, Chisato Urano, Yoshihiro Inaba
  • Publication number: 20020096892
    Abstract: A locking apparatus locks a moving body to a housing against an urging force applied to the moving body. The locking apparatus includes a cam provided on one of the moving body and the housing, and having an engagement groove and a releasing groove, and a swivel body provided on the other of the moving body and the housing. The swivel body has a trace pin moving along the grooves and a balancer for balancing the trace pin. Thus, upon receiving a sudden load when the trace pin is in an engaging condition with the engagement groove, the trace pin is prevented from moving from the engagement groove to the releasing groove to thereby lock the moving body.
    Type: Application
    Filed: January 18, 2002
    Publication date: July 25, 2002
    Applicant: Nifco Inc.
    Inventors: Tomoaki Sato, Yasuo Yamamoto
  • Publication number: 20020060293
    Abstract: An image display medium capable of providing an image display with less change in the image density, with less change in the uniformness of the density and at stable density contrast even after repetitive rewriting over a long period of time, and an image forming apparatus using the image display medium are provided. The image display medium and image forming apparatus have a pair of facing substrates, at least two kinds of particles sealed in a space between the pair of the substrates in which the at least two kinds of particles have a characteristic that at least one kind of them is positively chargeable and at least one other kind of them is negatively chargeable, and the particles chargeable positively and negatively are of colors different from each other and a charge controller is internally added to one or both of the particles chargeable positively and negatively.
    Type: Application
    Filed: September 27, 2001
    Publication date: May 23, 2002
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yasuo Yamamoto, Chisato Urano, Yoshihiro Inaba, Takeshi Matsunaga, Yoshinori Machida, Kiyoshi Shigehiro
  • Publication number: 20020054987
    Abstract: A microporous stencil sheet for use in stencil printing and methods for making stencil master using this microporous stencil sheet are disclosed herein. The microporous stencil sheet is for use in stencil printing using a low-viscosity ink with a viscosity ranging from 0.001 to 1 Pa•s, comprises an inelastic resin film and has an air permeability ranging from 1 to 600 seconds and a thickness ranging from 1 to 100 &mgr;m. The methods for making stencil master using this microporous stencil sheet comprise the step of closing the micropores of the stencil sheet in a non-printing portion of a desired printed image.
    Type: Application
    Filed: June 5, 2001
    Publication date: May 9, 2002
    Inventors: Yasuo Yamamoto, Hideyuki Kinoshita
  • Publication number: 20020051865
    Abstract: A printing sheet which prevents setoff while transferring a sufficient quantity of ink and maintains necessary dot uniformity can be obtained by ensuring characteristics that the centerline average roughness showing the larger value is 1.0-3.5 &mgr;m and the ratio of centerline average obtained by dividing the larger value by the smaller value is less than 1.15 where said values are chosen at the point where the difference between the centerline average roughness in a certain direction and the centerline average roughness at right angles to said direction is maximal. Further, the abovementioned quality is further improved by appropriately ensuring that the oil absorbability is more than 4 mg/cm2 and less than 7 mg/cm2 when the contact time between the oil component having a surface tension of 27-30 mN/m at 20° C. and the printing sheet is 5 seconds and/or that the median pore diameter is 1.7-3.5 &mgr;m, in addition to the abovementioned characteristics.
    Type: Application
    Filed: March 28, 2001
    Publication date: May 2, 2002
    Inventors: Makoto Hasegawa, Noriko Kumazawa, Akinobu Chatani, Nobuo Nakanishi, Ryuta Ono, Hiroki Yamamoto, Teruaki Ookawa, Yasuo Yamamoto
  • Publication number: 20020040647
    Abstract: A micro porous plastic sheet is stencil plate made by a method for stencil plate making of a stencil sheet for stencil printing under the following conditions: heat is provided to form a negative image with TPH at −30≦Tp−Tm≦300° C. (Tp is heating peak temperature and Tm is melting temperature(melting point) of the sheet) and in 10≦To×100/Ts≦80% (To is current-carrying time period and Ts is current-carrying cycle), micro pores are closed by the pressure for stencil plate making of 0.1≦P≦1.0 MPa, and the thermal shrinkage rate of the sheet measured by TMA is set to 1≦STm−30≦20% (STm−30 is a thermal shrinking rate of the sheet at a temperature 30° C. lower than the melting point TM).
    Type: Application
    Filed: October 2, 2001
    Publication date: April 11, 2002
    Inventors: Hideyuki Kinoshita, Yasuo Yamamoto
  • Publication number: 20020033104
    Abstract: A stencil printing machine is provided with a paper feed section feeding a print sheet, which is allowed to have paper dusts thereon, in a paper feed path, and a print section to which the print sheet is transferred, and including a printing drum carrying thereon a stencil sheet having a perforated image area formed on the basis of image data and a rotary printing press member located in close proximity to an outer circumferential periphery of the printing drum to impart printing pressure thereto to allow the print sheet to be transferred in press contact between the printing drum and the rotary printing press member such that printing ink is transferred onto the print sheet to generate a desired image thereon through the perforated image area.
    Type: Application
    Filed: July 19, 2001
    Publication date: March 21, 2002
    Inventors: Toshihiro Endo, Yasuo Yamamoto
  • Publication number: 20010056132
    Abstract: An ultraviolet curable ink for stencil printing having a high yield value, hence excellent on-machine stability, is provided, which comprises an ultraviolet curable resin, a pigment, and an organic clay treated with a specific quaternary ammonium salt including a hectorite or bentonite based organic clay treated with dimethyl di(hydrogenated tallow) ammonium (DMDHT) salt.
    Type: Application
    Filed: May 8, 2001
    Publication date: December 27, 2001
    Applicant: Riso Kagaku Corporation
    Inventors: Yasuo Yamamoto, Toshihiro Endo
  • Publication number: 20010029867
    Abstract: An ultraviolet radiation curable ink is provided, which does not make the printed image hazy or blurred, and does not drip or leak from the ink container or printing drum, hence being excellent in both printability and operability. The ultraviolet radiation curable ink comprises an ultraviolet radiation curable resin monomer or oligomer as a varnish, and the ink has a viscosity of 2.0 to 13.0 Pa·s measured at a shear rate of 100 (l/s) at 23° C., and has an yield value of 25 Pa or higher at 23° C. The ink can contain a viscosity regulator, for example, as a powder. It is preferable that the content of powdery ingredients in the ink is 30 wt % or less based on the total weight of the ink.
    Type: Application
    Filed: March 5, 2001
    Publication date: October 18, 2001
    Inventors: Akiko Hayashi, Toshihiro Endo, Yasuo Yamamoto
  • Patent number: 6255339
    Abstract: Compounds represented by the following formula (I) and pharmaceutically acceptable salts thereof are disclosed. The compounds have progesterone receptor binding inhibitory activity and, hence, can be used as therapeutic and prophylactic agents for progesterone-related diseases. Specifically, they are useful as abortifacients, oral contraceptive pills, carcinostatic agents for breast cancer and ovarian cancer, therapeutic agents for endometriosis, meningioma, and myeloma, and therapeutic and prophylactic agents for osteoporosis and climacteric disturbance.
    Type: Grant
    Filed: July 21, 1998
    Date of Patent: July 3, 2001
    Assignee: Meiji Seika Kaisha, Ltd.
    Inventors: Kenichi Kurihara, Rie Shinei, Kiyoshi Tanabe, Yasuo Yamamoto, Keiichi Ajito, Kaori Miyajima, Yuji Tabata, Shohei Yasuda, Kuniaki Tatsuta, Tsuneo Okonogi
  • Patent number: 6174432
    Abstract: A hydrotreating catalyst for heavy hydrocarbon oil, which comprises a boron-containing alumina carrier containing from 1 to 12 wt %, in terms of an oxide, of boron based on the catalyst, having supported thereon a metal in the Group VI, wherein the catalyst has an average pore size of from 19 to 25 nm, a pore volume of from 0.65 to 0.8 ml/g, a catalyst strength of 3 lb/mm or more, and a specific surface area of from 70 to 130 m2/g; a process for producing the hydrotreating catalyst; and a method for hydrotreating heavy hydrocarbon oil, which comprises conducting a catalytic reaction of heavy hydrocarbon oil in the presence of the catalyst composition at a temperature of from 300 to 500° C., a pressure of from 3 to 20 MPa, a hydrogen/oil ratio of from 400 to 3000 Nl/l, and LHSV of from 0.1 to 1.5 hr−1.
    Type: Grant
    Filed: June 17, 1999
    Date of Patent: January 16, 2001
    Assignees: Petroeum Energy Center, Cosmo Oil Co., Ltd.
    Inventors: Yoshihiro Mizutani, Keizou Nagata, Yukio Shibata, Yasuo Yamamoto
  • Patent number: 6161592
    Abstract: A heat-resistant hose for transport of high temperature fluid, wherein the inner surface of the hose in contact with said fluid comprises a material containing blended rubber of fluorinated rubber (FKM) and acrylic rubber (ACM). In particular, a heat-resistant hose for transport of fluid containing high temperature oil which comprises an inner tubular body composed of one or more layers at least the most inner layer of which consists of blended rubber of FKM and ACM, fiber reinforcements wound around the outer surface of said inner tubular body the thread extracting force of which the fiber reinforcements is not less than 1N/mm, and an outer tubular body composed of one or more layers bonded on the surface of said fiber reinforcements, said most inner layer preferably containing carbon black having the value (A.times.B) of not more than 3500 obtained by multiplying the value A of nitrogen adsorption specific surface area (m.sup.
    Type: Grant
    Filed: March 24, 1999
    Date of Patent: December 19, 2000
    Assignee: Tokai Rubber Industries, Ltd.
    Inventors: Yasuo Yamamoto, Shinobu Kanbe, Masashi Kondo, Hiroyoshi Mori
  • Patent number: 6124066
    Abstract: A carrier for electrophotography having a resin coating layer containing a conductive powder having an aspect ratio of not less than 3 on the core material, in which the dynamic electric resistance of the core material in a magnetic brush state under an electric field of 10.sup.4 V/cm is not higher than 1 .OMEGA..cm, and the electric resistance of the resin coating layer is within a range of from 10 to 1.times.10.sup.8 .OMEGA..cm, and a developer for an electrostatic latent image using the carrier. An image forming method on which the developing process includes using the above-mentioned developer for an electrostatic latent image, whose development curve, expressed by a contrast potential and the developing toner quantity, has a saturation area, and applying the developing bias to the developer carrying member so that the developing toner quantity shows the saturation characteristic.
    Type: Grant
    Filed: December 18, 1997
    Date of Patent: September 26, 2000
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Suk Kim, Yasuo Yamamoto, Kazuhiko Yanagida
  • Patent number: 6076793
    Abstract: A cup holder used in a vehicle includes a storing portion fixed to the vehicle, a slider slidably accommodated in the storing portion, a cup inserting hole provided in the slider, an arm rotatably disposed around a shaft attached to the slider near the cup inserting hole, and a diameter changing device. The diameter changing device includes a tracing portion fixed to the arm to slide along an inner side surface of the storing portion, a spring for urging the tracing portion toward the inner side surface of the storing portion to thereby allow an end of the arm to rotate in a direction of reducing an inner diameter of the cup inserting hole, and a cam surface protruded from the inner side surface of the storing portion. When the slider is drawn out from the storing portion, the end of the arm is rotated by the cam surface in a direction of enlarging the inner diameter of the cup inserting hole. Generation of a noise at the time of pulling out the slider from the storing portion is prevented.
    Type: Grant
    Filed: September 13, 1999
    Date of Patent: June 20, 2000
    Assignee: Nifco Inc.
    Inventor: Yasuo Yamamoto
  • Patent number: 6054241
    Abstract: In image forming method comprising an exposure step of forming an electrostatic latent image and a developing step of developing the electrostatic latent image, a developer comprises a magnetic carrier and a toner; a developing curve of the developer at the time when the developer is used has a saturated characteristic, the developing curve being as expression of the relation between the amount of toner transferred to the latent image support member and contrast potential, the contrast potential being determined by the developing bias potential applied to the developer support member and the potential of an exposed portion of the latent image support member; a proportion of the toner in the developer is in a range from 5 to 10% by weight; a time constant of the developer is less than or equal to 40 msec; and the developing step comprises applying developing bias voltage to the developer support member such that an amount of the toner transferred to the latent image support member reaches a saturated range.
    Type: Grant
    Filed: July 8, 1998
    Date of Patent: April 25, 2000
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yasuo Yamamoto, Yutaka Kanai, Taku Fukuhara