Patents by Inventor Kiyonobu Ohtani

Kiyonobu Ohtani 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).

  • Method of processing rock with laser and apparatus for the same
    Patent number: 8256530
    Abstract: An object is to provide a method capable of boring a borehole even when quartz glass or silicon dioxide is deposited as molten dross by laser irradiation. A laser irradiation position of a workpiece is irradiated with a laser having wavelength of 1.2 ?m or longer and a high factor of absorption into liquid, for example, a CO2 laser, from a laser oscillator through liquid. By high pressure generated in an advancing microbubble flow occurring in the liquid, molten dross is scattered. Thus, the processing, such as boring, of the rock is performed.
    Type: Grant
    Filed: December 18, 2007
    Date of Patent: September 4, 2012
    Assignees: Japan Drilling Co., Ltd., Tohoku University, Japan Oil, Gas and Metals National Corporation
    Inventors: Toshio Kobayashi, Kazuyoshi Takayama, Kiyonobu Ohtani, Satoru Umezu
  • METHOD OF PROCESSING ROCK WITH LASER AND APPARATUS FOR THE SAME
    Publication number: 20100001179
    Abstract: An object is to provide a method capable of boring a borehole even when quartz glass or silicon dioxide is deposited as molten dross by laser irradiation. A laser irradiation position of a workpiece is irradiated with a laser having wavelength of 1.2 ?m or longer and a high factor of absorption into liquid, for example, a CO2 laser, from a laser oscillator through liquid. By high pressure generated in an advancing microbubble flow occurring in the liquid, molten dross is scattered. Thus, the processing, such as boring, of the rock is performed.
    Type: Application
    Filed: December 18, 2007
    Publication date: January 7, 2010
    Applicants: JAPAN DRILLING CO., LTD., TOHOKU UNIVERSITY, JAPAN OIL, GAS AND METALS NATIONAL CORPORATION
    Inventors: Toshio Kobayashi, Kazuyoshi Takayama, Kiyonobu Ohtani, Satoru Umezu