Patents by Inventor Takayoshi Aoki

Takayoshi Aoki 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: 5340678
    Abstract: A dry toner for developing an electrostatic latent image comprising toner particles and fine particles of a lubricant coated with an inorganic compound fine powder and an image formation method using the same. The toner is excellent in fluidity, cleaning properties, stability with environmental changes, and durability.
    Type: Grant
    Filed: June 30, 1993
    Date of Patent: August 23, 1994
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Chiaki Suzuki, Atuhiko Eguchi, Yuka Ishihara, Takayoshi Aoki, Seiichi Takagi, Toshiyuki Yano, Masao Mochizuki
  • Patent number: 5178984
    Abstract: A positively chargeable electrophotographic toner is disclosed, which is prepared by adding to toner particles silica fine particles having been surface treated with a homo-or copolymer comprising, as a monomer component, a dialkylaminoalkyl acrylate or a dialkylaminoalkyl methacrylate in the form of a quaternary ammonium salt. The toner has improved fluidity and improved anti-caking properties while exhibiting satisfactory charging properties and environmental stability and causing no image defects.
    Type: Grant
    Filed: September 11, 1991
    Date of Patent: January 12, 1993
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Ikutaroh Nagatsuka, Atuhiko Eguchi, Takayoshi Aoki
  • Patent number: 5176978
    Abstract: A dry toner for developing electrostatic images is disclosed, which comprises a binder resin, a colorant and a wax consisting of a low molecular weight polypropylene and a high density polyethylene having a density of 0.96 or more, a molecular weight of 2,000 to 20,000 and an acid value of 1 or less, wherein the wax is dispersed in the binder resin to form domains having a size of 0.1 to 1.5 .mu.m. A process for producing the toner is also disclosed.
    Type: Grant
    Filed: October 17, 1991
    Date of Patent: January 5, 1993
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Kouichi Kumashiro, Tetsu Torigoe, Chiaki Suzuki, Takaichi Kimura, Takayoshi Aoki
  • Patent number: 5176979
    Abstract: A positively chargeable electrophotographic toner excellent in powder fluidity, circumstance dependency and durability is disclosed. The toner comprises a toner particle and a silica fine particle the surface of which is treated with a substantially water-insoluble or sparingly water-soluble quaternary ammonium salt compound.
    Type: Grant
    Filed: August 14, 1991
    Date of Patent: January 5, 1993
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Atuhiko Eguchi, Ikutaroh Nagatsuka, Takayoshi Aoki
  • Patent number: 5155681
    Abstract: An apparatus for moving from position to position along coke ovens during the production of coke which is capable of stopping at its target stop position with high accuracy and without deteriorating its operating efficiency. In the mobile apparatus, a travel pattern is stored in a computer for controlling the apparatus depending on a target stop position of the apparatus and its travel direction immediately before its stop. As a result, any stop error due to the particular conditions inherent in each target stop position can be eliminated. The computer may include a program for correcting the travel pattern depending on the stop error if any.
    Type: Grant
    Filed: May 21, 1991
    Date of Patent: October 13, 1992
    Assignee: Mitsubishi Kasei Corporation
    Inventors: Takayoshi Aoki, Mitsunori Tsuruhara
  • Patent number: 5155000
    Abstract: A dry toner composition containing titanium dioxide particles, the surfaces of the particles comprising an organic compound having a melting point of from about 40.degree. C. to about 150.degree. C.
    Type: Grant
    Filed: November 14, 1989
    Date of Patent: October 13, 1992
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yasuo Matsumura, Takayoshi Aoki, Masayuki Takeda, Chiaki Suzuki, Ikutaroh Nagatsuka
  • Patent number: 5110703
    Abstract: A carrier for use in developing an electrostatic or magnetic latent image in electrophotography, electrostatic recording, electrostatic printing or the like, which carrier is produced by atomizing a molten mixture of a magnetic powder and a binder resin containing a polyolefin and a polyolefin having a functional group. The polyolefin having a functional group is present in an amount ranging from about 50% by weight or less based on the total weight of the binder resin.
    Type: Grant
    Filed: March 19, 1990
    Date of Patent: May 5, 1992
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Ikutaroh Nagatsuka, Chiaki Suzuki, Masayuki Takeda, Yasuo Matsumura, Takayoshi Aoki
  • Patent number: 5085963
    Abstract: A dry developer for an electrophotographic process, said dry developer being composed of a toner and a dispersion type carrier composed of a resin and a magnetic powder, wherein polyethylene having a molecular weight of not larger than 10,000, a density of at least 0.95, and an average volume diameter of not larger than 15 .mu.m is externally added to the toner or directly mixed with the developer. The dry developer shows good fluidity and cleaning property, is excellent in environmental stability and durability, and can prevent the occurrence of the toner film phenomenon on a photoreceptor or carrier surfaces.
    Type: Grant
    Filed: September 19, 1990
    Date of Patent: February 4, 1992
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Chiaki Suzuki, Koichi Kumashiro, Tetsu Torigoe, Takaichi Kimura, Takayoshi Aoki
  • Patent number: 5059504
    Abstract: A carrier for a developer comprising a core material coated with a coating material consisting essentially of a copolymer of vinylidene fluoride and trifluoroethylene or hexafluoropropylene is disclosed. The carrier causes neither fog generation in the initial stage of running nor contamination of a developing machine because of its high rate of charge increase and satisfactory resistance to surface contamination, and exhibits excellent adhesion between the core material and the coating material.
    Type: Grant
    Filed: March 5, 1990
    Date of Patent: October 22, 1991
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Masayoshi Shinoki, Masahiro Takagi, Ikutaroh Nagatsuka, Koichi Kumashiro, Takayoshi Aoki, Masayuki Takeda
  • Patent number: 5037717
    Abstract: A developer for an electrostatic latent image is disclosed, which comprises a carrier powder, a toner powder, and a fine powder that has a particle size smaller than that of the toner powder said fine powder being made of a polymer which is located closer to the carrier side of the triboelectric series than to the toner side. The developer does not cause insufficient cleaning or toner filming on a photoreceptor or electrostatic recording element.
    Type: Grant
    Filed: November 16, 1988
    Date of Patent: August 6, 1991
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yukihiro Ishii, Takayoshi Aoki, Koichi Tanaka, Shigeru Sadamatsu
  • Patent number: 5013626
    Abstract: A magnetic powder-dispersed carrier for use in electrophotography, electrostatic printing, and other reprographic methods, comprising a large number of magnetic particles dispersed in a binder resin, the particles having a BET surface area no greater than 5 m.sup.2 /g, and an oil-absorbing capacity of no more than 25 ml/100 g.
    Type: Grant
    Filed: May 21, 1990
    Date of Patent: May 7, 1991
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yasuo Matsumura, Takayoshi Aoki, Ikutaroh Nagatsuka, Masao Mochizuki
  • Patent number: 4965160
    Abstract: A developer carrier is disclosed, which has a core containing a binder resin and a magnetic powder, and a surface layer thereon containing a compound having a lower critical surface tension than the binder resin. This developer when used in a magnetic brush development process provides superior charge characteristics, resistance to environmental changes, and extended life. In another aspect, the invention relates to a developer carrier produced by a process of (a) melting a carrier composition containing a binder resin, a magnetic powder and a compound having a lower critical surface tension than the binder resin, (b) spraying the molten carrier composition to form droplets, and (c) cooling the droplets with a gas stream having a temperature lower than the melting point of the composition to form substantially spherical particles having a high surface smoothness.
    Type: Grant
    Filed: September 25, 1989
    Date of Patent: October 23, 1990
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Ikutaroh Nagatsuka, Yasuo Matsumura, Masayuki Takeda, Chiaki Suzuki, Takayoshi Aoki
  • Patent number: 4954409
    Abstract: A developer for electrophotography is disclosed, which comprises a toner having a colorant and a carrier having a core material that is coated with a layer containing a polymer of a fluorinated alkyl acrylate or methacrylate, the monomer constituting less than 50 wt % of the total coating material.
    Type: Grant
    Filed: May 22, 1987
    Date of Patent: September 4, 1990
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Takayoshi Aoki, Masayuki Takeda
  • Patent number: 4943505
    Abstract: A developer for an electrostatic latent image is described, which comprises a toner powder and a fine powder having a particle size smaller than that of the toner powder, said fine powder being made of a polymer obtained by soap-free emulsion polymerization.
    Type: Grant
    Filed: March 6, 1985
    Date of Patent: July 24, 1990
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Takayoshi Aoki, Yukihiro Ishii, Koichi Tanaka, Shigeru Sadamatsu
  • Patent number: 4933253
    Abstract: A developer for an electrostatic latent image is disclosed, which comprises a toner powder and a fine powder of an acrylic homopolymer or copolymer having an average particle size smaller than that of the toner powder. The developer can be easily cleaned off without causing damage to a latent image-forming member.
    Type: Grant
    Filed: March 6, 1985
    Date of Patent: June 12, 1990
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Takayoshi Aoki, Yukihiro Ishii, Koichi Tanaka, Shigeru Sadamatsu
  • Patent number: 4929528
    Abstract: A carrier for a developer comprising a core material coated with a coating material consisting essentially of a copolymer of vinylidene fluoride and trifluoroethylene or hexafluoropropylene is disclosed. The carrier causes neither fog generation in the initial stage of running nor contamination of a developing machine because of its high rate of charge increase and satisfactory resistance to surface contamination, and exhibits excellent adhesion between the core material and the coating material.
    Type: Grant
    Filed: November 7, 1988
    Date of Patent: May 29, 1990
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Masayoshi Shinoki, Masahiro Takagi, Ikutaroh Nagatsuka, Koichi Kumashiro, Takayoshi Aoki, Masayuki Takeda
  • Patent number: 4914528
    Abstract: A synchronizing signal extraction circuit for digital magnetic tape decks, in which a level of a synchronizing signal is differentiated and compared against a minimum level. The synchronizing signal is used for reproduction purposes only if the differentiated synchronizing signal exceeds the minimum level. Thereby, old incompletely erased synchronizing signals are masked.
    Type: Grant
    Filed: May 22, 1987
    Date of Patent: April 3, 1990
    Assignee: Pioneer Electronic Corporation
    Inventors: Takayoshi Aoki, Masayuki Takeda, Yutaka Masumoto
  • Patent number: 4912004
    Abstract: A carrier for a developer is disclosed, comprising a carrier core containing a binder resin and a magnetic powder as essential components, and a coating layer provided on the surface of the carrier core, the coating layer containing a polymer obtained by polymerizing a charge controlling monomer in the presence of polyolefin.
    Type: Grant
    Filed: July 15, 1988
    Date of Patent: March 27, 1990
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Ikutaroh Nagatsuka, Yasuo Matsumura, Masayuki Takeda, Emi Takahashi, Takayoshi Aoki
  • Patent number: 4902597
    Abstract: A negative charging carrier for an electrophotographic developer is described, comprising a binder resin having dispersed therein a magnetic powder, wherein said carrier contains a fluorine-containing resin fine powder in an amount of from 5 to 50% by weight based on the total weight of the carrier. The carrier provides a developer for magnetic brush development having a prolonged life and a high rate of development.
    Type: Grant
    Filed: July 7, 1988
    Date of Patent: February 20, 1990
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Masayuki Takeda, Masao Mochizuki, Koichi Kumashiro, Ikutaroh Nagatsuka, Masayoshi Shinoki, Takayoshi Aoki
  • Patent number: 4871639
    Abstract: A carrier for developer is disclosed, which is produced by a process including the steps of mixing and heating a carrier material containing a binder resin and a magnetic powder and essentially free of solvent to obtain a molten dispersion of the magnetic powder in the resin; spraying the molten dispersion into droplets; and cooling the droplets to solidify the droplets into carrier particles. The carrier has excellent sphericality, high surface smoothness, and long life when used as a component of a two-component type developer in electrophotography.
    Type: Grant
    Filed: June 17, 1987
    Date of Patent: October 3, 1989
    Assignees: Fuji Xerox Co., Ltd., Nippon Iron Powder Co., Ltd.
    Inventors: Takayoshi Aoki, Ikutaroh Nagatsuka, Masayuki Takeda, Toshio Honjo, Kazuhiro Itoh, Kenji Uchida