Patents by Inventor Tomio Arai

Tomio Arai 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: 4833506
    Abstract: A toner density control method and apparatus of a copying device for copying continuously from a plurality of documents onto recording sheets optically detect the density of a patch image of a reference density plate formed on the surface of a photosensitive drum of the copying device so as to control the toner density. The patch image is formed prior to formation of an image of a first one of a plurality of the documents, the density of the patch image is detected, and a toner replenishment amount during a copying operation of the plurality of documents is maintained constant on the basis of the detected density.
    Type: Grant
    Filed: May 26, 1987
    Date of Patent: May 23, 1989
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Hiroshi Kuru, Tomio Arai
  • Patent number: 4801980
    Abstract: A toner density control apparatus wherein an image density of a reference image on a photosensitive member is compared with a predetermined level to control a toner density, a voltage to be applied on a light-emitting element is controlled according to a difference between an output of a light-receiving element when it receives a light reflected from a non-image surface region on the photosensitive member and correction reference data, and a signal is supplied to the outside when the voltage is increased more than a predetermined value.
    Type: Grant
    Filed: October 28, 1987
    Date of Patent: January 31, 1989
    Assignee: Konica Corporation
    Inventors: Tomio Arai, Hiroshi Kuru
  • Patent number: 4663021
    Abstract: A continuous process of producing carbonaceous pitch, including heat-treating an aromatic heavy oil for obtaining a first cracked product, and thermally cracking the first product in a cracking zone by direct contact with a gaseous heat transfer medium to obtain distillable cracked components and a mesophase-containing pitch. A first portion of the liquid phase in the cracking zone, including the mesophase-containing pitch, is separated into a mesophase-rich pitch and a matrix pitch having a low concentration of mesophase. The mesophase-rich pitch is recovered while at least a portion of the matrix pitch is recycled to the cracking zone. The distillable cracked components are withdrawn from the cracking zone and separated into light, middle and heavy fractions. At least a portion of the heavy fraction is heat treated and is recycled to the cracking zone.
    Type: Grant
    Filed: January 3, 1986
    Date of Patent: May 5, 1987
    Assignees: Fuji Standard Research, Inc., Sumitomo Metal Industries, Ltd.
    Inventors: Tomio Arai, Takao Nakagawa, Fumio Mogi, Noriaki Oshiguri
  • Patent number: 4591424
    Abstract: A method of preparing an carbonaceous pitch, including the steps of:subjecting a raw material oil to thermal cracking conditions while removing cracked, light hydrocarbon components to obtain a pitch product containing at least 5 weight % of mesophase and not more than 10 weight % of light hydrocarbon components with a boiling point at 60 mmHg of 300.degree. C. or less and having a softening point of between 160.degree. and 220.degree. C., the raw material oil being composed mainly of a residual oil which has a boiling point of 350.degree. C. or more and which is derived from a naphthene base petroleum crude; andremoving the mesophase from the pitch product to obtain a substantially mesophase-free carbonaceous pitch.
    Type: Grant
    Filed: May 17, 1984
    Date of Patent: May 27, 1986
    Assignee: Fuji Standard Research, Inc.
    Inventors: Shimpei Gomi, Tomio Arai, Fumio Mogi, Takao Nakagawa, Kunio Miura, Sugio Otani
  • Patent number: 4554148
    Abstract: A process for the preparation of carbon fibers, including the steps of:subjecting a raw material oil to thermal cracking conditions at a temperature of between 400.degree. to 500.degree. C. while removing cracked, light hydrocarbon components to obtain a pitch product containing at least 5 weight % of mesophase and not more than 10 weight % of light hydrocarbon components with a boiling point at 60 mmHg (absolute) of 300.degree. C. or less and having a softening point of between 140.degree. and 220.degree. C., the raw material oil having a boiling point of at least 500.degree. C. and containing at least 30 weight % of a residual oil which has a boiling point of at least 500.degree. C. and a metal content of at least 200 weight ppm and which is derived from a napthene base and/or intermediate base petroleum crude;removing the mesophase having a particle size of more than 10 .mu.
    Type: Grant
    Filed: May 17, 1984
    Date of Patent: November 19, 1985
    Assignee: Fuji Standard Research, Inc.
    Inventors: Shimpei Gomi, Tomio Arai, Fumio Mogi, Kunio Miura, Sugio Otani
  • Patent number: 4487686
    Abstract: A heavy hydrocarbon feed stock is, after being heat-treated in a first cracking zone, is introduced into a second thermal cracking zone for obtaining a thermally cracked product and a pitch product. The second cracking zone has a plurality of cracking reactors which are connected in series, through which is successively passed the treated feed stock and to each of which is supplied a gaseous heat transfer medium to maintain the liquid phase therein at a temperature sufficient for effecting the thermal cracking and to strip the resulting distillable, cracked components from the liquid phase. The thermal cracking temperature in one reactor is so controlled as to become higher than that in its adjacent upstream-side reactor. The distillable, cracked components in respective reactors are removed overhead therefrom and separated into a heavy fraction and a light fraction, while the liquid phase in the downstream-end reactor is discharged therefrom for recovery as the pitch product.
    Type: Grant
    Filed: February 24, 1984
    Date of Patent: December 11, 1984
    Assignees: Fuji Oil Company, Ltd., Fuji Standard Research, Chiyoda Chemical Engineering & Construction Co., Ltd.
    Inventors: Shimpei Gomi, Tomio Arai, Tomomitsu Takeuchi, Shigeru Miwa, Toru Takatsuka, Ryuzo Watari
  • Patent number: 4473221
    Abstract: A sheet feeding apparatus including a resilient rotatable separator roller which includes a radial cut permitting radial attachment and detachment from a rotatable shaft. A fixing device is provided for fixing the roller to the shaft.
    Type: Grant
    Filed: September 11, 1981
    Date of Patent: September 25, 1984
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventor: Tomio Arai
  • Patent number: 4361397
    Abstract: An improved cleaning apparatus for a copying machine includes, in addition to a conventional magnetic brush-type device in which a rotatable sleeve partially immersed in developer surrounds a group of magnets, a magnetic member disposed immediately upstream of the normal cleaning position at which the magnetic brush sleeve is brought into predetermined proximity with the photosensitive member. The magnetic member is located closely adjacent the surface of the photosensitive surface so that residual developer particles remaining on the photosensitive surface are magnetically attracted to the magnetic member prior to and for the purpose of supplementing conventional magnetic brush cleaning immediately downstream therefrom.
    Type: Grant
    Filed: August 27, 1980
    Date of Patent: November 30, 1982
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Hiroshi Katakura, Tomio Arai