Patents Assigned to Mitsui Mining Company, Limited
  • Glass-ceramic product and method of making the same
    Patent number: 4777151
    Abstract: Disclosed is a glass-ceramic product having a chemical composition, as expressed in terms of oxides with the exception of F, in the weight range of 35 to 60% SiO.sub.2, 10 to 20% Al.sub.2 O.sub.3, 12 to 25% MgO, 5 to 15% K.sub.2 O and 4 to 15% F, containing no B.sub.2 O.sub.3, and containing 40 to 70% by weight of fluorophlogopite microcrystals. This glass-ceramic product has a flexural strength of not less than 1500 kgf/cm.sup.2, a heat resistance of about 1100.degree. C., excellent dielectric properties and good machinability, and is a material capable of extending the range of use of high performance ceramics.
    Type: Grant
    Filed: April 7, 1986
    Date of Patent: October 11, 1988
    Assignee: Mitsui Mining Company, Limited
    Inventors: Keiichiro Koba, Akria Mathumoto, Yoshinori Koyanagi, Toshio Hamasaki, Katsuya Eguchi
  • Dust pre-removal method in a dry moving bed type adsorption tower
    Patent number: 4744804
    Abstract: In a dry moving bed type adsorption tower using a granular adsorbent, for example, for removing SO.sub.x and NO.sub.x from waste gases, the granular adsorbent entering the adsorption tower is previously rinsed with a gas in a feed pipe for the adsorbent, thereby avoiding the need to install a dust collector at the outlet of the adsorption tower.
    Type: Grant
    Filed: January 9, 1987
    Date of Patent: May 17, 1988
    Assignees: Mitsui Mining Company, Limited, Mitsui Miike Engineering Corp.
    Inventors: Kuninori Furuyama, Yoshiro Ito
  • Reactor of moving bed type
    Patent number: 4670226
    Abstract: A reactor of the moving bed type wherein a granular material is packed and held by a louver structure and moved downward and brought into contact with a gas passing through the louver, is improved so as to avoid both accumulation of dust on the louver part at the gas inlet side and excessive rising of the pressure loss.
    Type: Grant
    Filed: April 8, 1985
    Date of Patent: June 2, 1987
    Assignees: Mitsui Mining Company, Limited, Mitsui Miike Engineering Corp.
    Inventors: Kuninori Furuyama, Yoshiro Ito
  • Method of removing sulfur oxides and nitrogen oxides by dry process
    Patent number: 4469662
    Abstract: This invention relates to a method of removing sulfur and nitrogen oxides by a dry process comprising passing a waste gas through a bed of a carbonaceous adsorbent to remove sulfur oxides and adding ammonia to remove nitrogen oxides, characterized in that at least two carbonaceous adsorbent beds are used and the carbonaceous adsorbent used mainly for removal of sulfur oxides is further used for treatment of the waste gas leaving the final carbonaceous adsorbent bed to remove the ammonia.
    Type: Grant
    Filed: December 22, 1983
    Date of Patent: September 4, 1984
    Assignee: Mitsui Mining Company Limited
    Inventors: Takeshi Hamada, Yoshinobu Komatsubara
  • Process for manufacturing a carbonaceous material
    Patent number: 4117098
    Abstract: Process for manufacturing an isotropic carbonaceous material having a high density and a high crushing strength which comprises the steps of (a) extracting a reformed coal from at least one component selected from the group consisting of brown coal, lignite and grass peat in the presence of hydrogen gas; (b) heating the reformed coal to produce a green coke; and (c) coking the green coke.
    Type: Grant
    Filed: June 30, 1976
    Date of Patent: September 26, 1978
    Assignees: Mitsui Mining Company, Limited, Mitsui Coke Co., Ltd.
    Inventors: Katsunobu Tatsumoto, Kenji Fukuda