Patents by Inventor Kunio Toda

Kunio Toda 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: 20200283869
    Abstract: A high-strength cold-rolled steel sheet which is a steel sheet having a tensile strength of 980 MPa or more has a predetermined chemical component composition, a metallographic microstructure of the steel sheet contains, by area ratio, ferrite and granular bainite: 10% or more and 50% or less in total, one or both of upper bainite and lower bainite: 10% or more and 50% or less in total, tempered martensite: more than 0% and 30% or less, retained austenite: 5% or more, and one or more of pearlite, cementite, and martensite: 0% to 10% in total, and an area ratio of the ferrite with respect to a total area ratio of the ferrite and the granular bainite is 25% or less.
    Type: Application
    Filed: November 15, 2017
    Publication date: September 10, 2020
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Yuri TODA, Kunio HAYASHI, Katsuya NAKANO, Eisaku SAKURADA, Akihiro UENISHI, Kengo TAKEDA
  • Publication number: 20200040435
    Abstract: A steel sheet includes a predetermined chemical composition and a metal structure represented by, in area fraction, ferrite: 50% to 95%, granular bainite: 5% to 48%, martensite: 2% to 30%, and upper bainite, lower bainite, tempered martensite, retained austenite, and pearlite: 5% or less in total.
    Type: Application
    Filed: January 25, 2017
    Publication date: February 6, 2020
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Katsuya NAKANO, Kunio HAYASHI, Yuri TODA, Eisaku SAKURADA, Akihiro UENISHI
  • Publication number: 20200024706
    Abstract: A steel sheet includes a predetermined chemical composition and a metal structure represented by, in area fraction, ferrite: 30% to 50%, granular bainite: 5% to 20%, martensite: 30% to 55%, bainite: less than 35%, and retained austenite and pearlite: 10% or less in total. Preferably, of the steel sheet, a tensile strength is 1180 MPa or more, elongation is 10% or more, and a hole expansion value is 20% or more. Further preferably, a VDA bending angle in the case where a thickness is set to t (mm) is “7.69t2?38.4t+109” or more.
    Type: Application
    Filed: January 30, 2017
    Publication date: January 23, 2020
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Katsuya NAKANO, Kunio HAYASHI, Yuri TODA, Eisaku SAKURADA, Akihiro UENISHI
  • Publication number: 20190249282
    Abstract: A steel sheet includes a predetermined chemical composition and a metal structure represented by, in area fraction, ferrite: 50% to 95%, granular bainite: 5% to 48%, tempered martensite: 2% to 30%, upper bainite, lower bainite, fresh martensite, retained austenite, and pearlite: 5% or less in total, and the product of the area fraction of the tempered martensite and a Vickers hardness of the tempered martensite: 800 to 10500.
    Type: Application
    Filed: January 31, 2017
    Publication date: August 15, 2019
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Katsuya NAKANO, Kunio HAYASHI, Yuri TODA, Eisaku SAKURADA, Akihiro UENISHI
  • Publication number: 20190226046
    Abstract: A steel sheet according to an aspect of the present invention has a chemical composition within a predetermined range; in which a metallographic structure at a thickness ¼ portion includes, by unit area %, ferrite: 10% or more and less than 50%, granular bainite: 5% or more and less than 50%, and martensite: 20% or more and less than 60%; in the metallographic structure at the thickness ¼ portion, a total of upper bainite, lower bainite, residual austenite, and pearlite is 0% or more and less than 15% by unit area %; at the thickness ¼ portion, a product of an area ratio Vm of the martensite and an average hardness Hv of the martensite is 12,000 to 34,000; and a tensile strength is 980 MPa or higher.
    Type: Application
    Filed: September 13, 2016
    Publication date: July 25, 2019
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Yuri TODA, Kunio HAYASHI, Katsuya NAKANO, Hiroyuki KAWATA, Akihiro UENISHI
  • Publication number: 20110170912
    Abstract: The present invention provides a toner cartridge and its recycling method in which a clearance due to stack of the housing and the lid can reliably be sealed so that toner leakage can be prevented. A toner cartridge which is set in an image forming apparatus to feed toner to the image forming apparatus includes a housing having a toner containing portion for containing toner therein, and a lid for covering the toner containing portion of the housing. A stack portion where the housing and the lid are stacked on each other is sealed by a sealing member having first and second adhesive materials provided on both-side surfaces of a base material with the first adhesive material stuck on an outer peripheral surface of the stack portion and with a release paper stuck on the second adhesive material.
    Type: Application
    Filed: September 4, 2009
    Publication date: July 14, 2011
    Applicant: Konica Minolta Business Technologies, Inc
    Inventors: Toshihide Taniguchi, Kunio Toda, Ikuo Ichino, Shigehisa Nakayama, Kenichi Wada, Shouji Imaizumi, Kenzo Toya, Hiroshi Ozawa
  • Patent number: 5283615
    Abstract: An image forming apparatus is provided with an optical system for forming a first electrostatic latent image and a second electrostatic latent image on a rotatable photosensitive member, a first developing device accommodating a first developer for developing the first electrostatic latent image, and a second developing device accommodating a second developer for developing the second electrostatic latent image. The second developing device is located downstream from the first developing device in a direction of rotation of the photosensitive member and is provided with a developing roller having a magnetic force. The second developer differs in color from the first developer and has a magnetism greater than the first developer. The second developer is transported to the second electrostatic latent image along a periphery of the developing roller.
    Type: Grant
    Filed: October 11, 1990
    Date of Patent: February 1, 1994
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Tomoaki Yokoyama, Tateki Oka, Kunio Toda
  • Patent number: 5122843
    Abstract: An image forming apparatus includes an image support member; a first electrostatic latent image forming device for forming a first electrostatic latent image on the image support member; a first developing device for developing the first electrostatic latent image with first toner; a second electrostatic latent image forming device for forming a second electrostatic latent image on the image support member; and a second developing device for developing the second electrostatic latent image with second toner; the second toner having a color different from that of the first toner and having charging characteristics relative to carrier, identical with those of the first toner; the second toner having an average particle diameter larger than that of the first toner.
    Type: Grant
    Filed: February 13, 1991
    Date of Patent: June 16, 1992
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Tomoaki Yokoyama, Tateki Oka, Kunio Toda
  • Patent number: 5038176
    Abstract: An image forming apparatus having plural developing devices, comprising: a photosensitive member arranged rotatably in one direction and holding an electrostatic latent image corresponding to an original image; a developing sleeve rotatably arranged in each developing device at a position confronting said photosensitive member to transport a developer; a device for simultaneously driving for rotation of each of said developing sleeves in said developing devices; and an adjusting mechanism for adjusting operation of said developing devices so that in a region where said developing sleeves confront with said photosensitive member, a developer packaged density (F) in said developing device arranged at an upstream side in a rotational direction of said member is larger than that of said developing device arranged at a downstream side in the rotational direction of said member, which isF=Vd/Ds,where Vd is an amount of the developer passing between said developing sleeve and said photosensitive member per hour, and
    Type: Grant
    Filed: June 6, 1989
    Date of Patent: August 6, 1991
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Tomoaki Yokoyama, Kunio Toda, Taisuke Nagao
  • Patent number: 5036369
    Abstract: An image forming apparatus includes a photosensitive member rotatably supported; an upstream developing device, in a rotary direction of the member, for developing an electrostatic latent image corresponding to a solid image and/or a literal image with an accommodated developer therein; a downstream developing device, in the direction thereof, for developing an electrostatic latent image corresponding to a line image with an accommodated developer in the same color as that in the upstream developing device; a cleaning device for collecting the developer remained on the surface of the member; and a developer transporting device for transporting the developer collected by the cleaning device to the upstream developing device.
    Type: Grant
    Filed: June 29, 1989
    Date of Patent: July 30, 1991
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Kunio Toda, Tomoaki Yokoyama, Taisuke Nagao
  • Patent number: 4954843
    Abstract: An image forming apparatus wherein a photosensitive layer arranged to rotate in one direction is charged by a charger, and a negative electrostatic latent image is formed thereon by an exposure unit and then is subjected to reversal development by a developing device so that a positive noticeable image can be attained. The apparatus has a scorotoron charger for charging the negative latent image which has just been formed by the exposure unit with the opposite polarity thereof. A grid of the scorotoron charger is constituted to be impressed with a voltage with the same polarity as the latent image and a value lower than that of the surface potential, and by the scorotoron charger, the potential of the non-imaged portions of the latent image is lowered around the grid voltage.
    Type: Grant
    Filed: May 23, 1989
    Date of Patent: September 4, 1990
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Tateki Oka, Naoki Toyoshi, Kunio Toda
  • Patent number: 4924270
    Abstract: A toner supply device including a hopper for containing the toner; a toner supply roller rotatably disposed below the hopper so as to fill an opening formed in a lower section of the hopper; a charging blade which is disposed so as to be in close contact under pressure with the toner supply roller to electrically charge the toner which is transported on the toner supply roller; a toner scraping mechanism having a toner scraping blade arranged at a position located downstream to the charging blade with respect to a rotational direction of the toner supply; a sensor for detecting the toner density; and a control unit for controlling the toner scraping mechanism depending on signals from the sensor so as to make the toner scraping blade move to one of a first position at which it comes in close contact under pressure with the toner supply roller and a second position at which the blade stands apart from the toner supply roller.
    Type: Grant
    Filed: October 27, 1988
    Date of Patent: May 8, 1990
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Mineyuki Sako, Tateki Oka, Yasuyuki Hiromoto, Tomoaki Yokoyama, Kunio Toda