Patents by Inventor Hikaru Ishikawa
Hikaru Ishikawa 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).
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Patent number: 9813273Abstract: A peak suppression device includes an acquiring unit that acquires multiple envelopes of carrier signals that are included in a multicarrier signal, an adding unit that adds the envelopes to generate a combined envelope, a detecting unit that detects a peak value and a peak timing of the multicarrier signal by using the combined envelope, and a suppressing unit that suppresses a peak of the multicarrier signal in accordance with the peak value and the peak timing.Type: GrantFiled: September 23, 2015Date of Patent: November 7, 2017Assignee: FUJITSU LIMITEDInventors: Hiroyoshi Ishikawa, Toshio Kawasaki, Hikaru Ishikawa, Kazuo Nagatani
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Patent number: 9755877Abstract: A peak suppression device includes a suppression-signal generating unit and a band pass filter (BPF). The suppression-signal generating unit generates a suppression signal that is obtained by adding, to a transmission signal, a frequency component in which components of frequencies from a boundary of a band of the transmission signal to a frequency that is away therefrom toward an out-band of the transmission signal by predetermined frequencies are attenuated, out of frequency components of a signal to suppress a peak of the transmission signal. The BPF attenuates, after the suppression signal is amplified by the amplifier, a frequency component outside the band of the transmission signal in the amplified suppression signal.Type: GrantFiled: February 26, 2016Date of Patent: September 5, 2017Assignee: FUJITSU LIMITEDInventors: Hiroyoshi Ishikawa, Hikaru Ishikawa, Kazuo Nagatani, Takuro Nishikawa, Ryo Koizumi, Takeshi Sugiyama, Yasuharu Amezawa
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Publication number: 20160373143Abstract: A wireless device includes a clipping unit that compares a set threshold and power of a transmission signal, and suppresses power of the transmission signal when the power is equal to or higher than the threshold, an amplifier that amplifies the transmission signal, a memory that stores therein the threshold set in the clipping unit and a voltage value set in the amplifier, in association with an occupied bandwidth occupied by a plurality of carriers and a used bandwidth used as the carriers, and a processor that acquires carrier setting information indicating a carrier arrangement of a plurality of carriers included in the transmission signal, reads a threshold and a voltage value corresponding to an occupied bandwidth and a used bandwidth of the transmission signal from the memory, sets the read threshold in the clipping unit, and sets the read voltage value in the amplifier.Type: ApplicationFiled: April 13, 2016Publication date: December 22, 2016Applicant: FUJITSU LIMITEDInventors: Hikaru Ishikawa, Takashi Ono, KYOSUKE MUKAIDA
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Publication number: 20160261445Abstract: A peak suppression device includes a suppression-signal generating unit and a band pass filter (BPF). The suppression-signal generating unit generates a suppression signal that is obtained by adding, to a transmission signal, a frequency component in which components of frequencies from a boundary of a band of the transmission signal to a frequency that is away therefrom toward an out-band of the transmission signal by predetermined frequencies are attenuated, out of frequency components of a signal to suppress a peak of the transmission signal. The BPF attenuates, after the suppression signal is amplified by the amplifier, a frequency component outside the band of the transmission signal in the amplified suppression signal.Type: ApplicationFiled: February 26, 2016Publication date: September 8, 2016Inventors: Hiroyoshi ISHIKAWA, Hikaru ISHIKAWA, Kazuo NAGATANI, Takuro NISHIKAWA, Ryo KOIZUMI, Takeshi SUGIYAMA, Yasuharu AMEZAWA
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Publication number: 20160227549Abstract: A radio device includes: a peak power reducer that reduces, according to a peak power of a multi-carrier signal obtained by a multiplexing of a plurality of carrier signals, a gain of the carrier signals before the multiplexing; and an output power corrector that corrects a power of the carrier signals before the multiplexing using a power correction value according to an occupied bandwidth of the multi-carrier signal.Type: ApplicationFiled: January 12, 2016Publication date: August 4, 2016Applicant: FUJITSU LIMITEDInventors: HIDEHARU SHAKO, Hikaru ISHIKAWA, Akihiko Komatsuzaki
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Publication number: 20160119172Abstract: A peak suppression device includes an acquiring unit that acquires multiple envelopes of carrier signals that are included in a multicarrier signal, an adding unit that adds the envelopes to generate a combined envelope, a detecting unit that detects a peak value and a peak timing of the multicarrier signal by using the combined envelope, and a suppressing unit that suppresses a peak of the multicarrier signal in accordance with the peak value and the peak timing.Type: ApplicationFiled: September 23, 2015Publication date: April 28, 2016Inventors: HIROYOSHI ISHIKAWA, TOSHIO KAWASAKI, Hikaru Ishikawa, Kazuo Nagatani
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Patent number: 8831136Abstract: A wireless apparatus includes amplifying systems each including a storing unit storing a distortion compensation coefficient for compensation for a nonlinear distortion of one or more transmission signals, a compensator compensating for the nonlinear distortion using the distortion compensation coefficient stored in the storing unit, and an amplifier amplifying the transmission signal after distortion compensation.Type: GrantFiled: January 30, 2013Date of Patent: September 9, 2014Assignee: Fujitsu LimitedInventors: Hikaru Ishikawa, Satoshi Matsubara, Hideharu Shako
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Publication number: 20130259154Abstract: A wireless apparatus includes amplifying systems each including a storing unit storing a distortion compensation coefficient for compensation for a nonlinear distortion of one or more transmission signals, a compensator compensating for the nonlinear distortion using the distortion compensation coefficient stored in the storing unit, and an amplifier amplifying the transmission signal after distortion compensation.Type: ApplicationFiled: January 30, 2013Publication date: October 3, 2013Applicant: FUJITSU LIMITEDInventors: Hikaru ISHIKAWA, Satoshi MATSUBARA, Hideharu SHAKO
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Patent number: 8376922Abstract: A conductive roller such as a developing roller, a charging roller or the like provided with a resin coating layer on a surface of an elastic layer, and more particularly to a conductive roller having the resin coating layer using an ultraviolet-curing type resin or an electron beam curing type resin and being obtained by contriving a structure of the resin coating layer, rendering the resin coating layer to contain microparticles, controlling the particle size of the microparticles, or forming the resin coating layer after the outer peripheral surface of the elastic layer is subjected to surface treatment.Type: GrantFiled: June 8, 2005Date of Patent: February 19, 2013Assignee: Bridgestone CorporationInventors: Shuyou Akama, Hiroyuki Anzai, Hiroyuki Kanesugi, Hikaru Ishikawa, Junji Sakata, Koji Takagi, Takayuki Sugimura
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Patent number: 7857831Abstract: A lip closing tool can be configured to encourage an infant or the like to close his/her mouth unconsciously and keep his/her mouth closed, thereby encouraging formation of a habit of nasal respiration. The lip closing tool can include a lip contact portion that is contacted by the outer surface of the lips during use, and a main body that is configured to be disposed inside the oral cavity during use. The main body can include a teeth contact portion that is disposed on the outer surface of the teeth during use and extends in a left-right direction. A thin lip contacting portion can connect the lip contact portion to the teeth contact portion and can be contacted by the upper and lower lips during use. The teeth contact portion can be formed entirely and integrally from a flexible material. Stimulation portions can be provided by enlarging the volume of the teeth contact portion near the end of right and left paths thereof.Type: GrantFiled: February 10, 2006Date of Patent: December 28, 2010Assignee: Pigeon CorporationInventors: Hikaru Ishikawa, Mitsuo Iida
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Publication number: 20090018582Abstract: A lip closing tool can be configured to encourage an infant or the like to close his/her mouth unconsciously and keep his/her mouth closed, thereby encouraging formation of a habit of nasal respiration. The lip closing tool can include a lip contact portion that is contacted by the outer surface of the lips during use, and a main body that is configured to be disposed inside the oral cavity during use. The main body can include a teeth contact portion that is disposed on the outer surface of the teeth during use and extends in a left-right direction. A thin lip contacting portion can connect the lip contact portion to the teeth contact portion and can be contacted by the upper and lower lips during use. The teeth contact portion can be formed entirely and integrally from a flexible material. Stimulation portions can be provided by enlarging the volume of the teeth contact portion near the end of right and left paths thereof.Type: ApplicationFiled: February 10, 2006Publication date: January 15, 2009Inventors: Hikaru Ishikawa, Mitsuo Iida
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Publication number: 20080292366Abstract: This invention relates to a conductive roller such as a developing roller, a charging roller or the like provided with a resin coating calyer on a surface of an elastic layer, and more particularly to a conductive roller having the resin coating layer using an ultraviolet-curing type resin or an electron beam curing type resin and being obtained by contriving a structure of the resin coating layer, rendering the resin coating layer to contain microparticles, controlling the particle size of the microparticles, or forming the resin coating layer after the outer peripheral surface of the elastic layer is subjected to surface treatment.Type: ApplicationFiled: June 8, 2005Publication date: November 27, 2008Applicant: Bridgestone CorporationInventors: Shuyou Akama, Hiroyuki Anzai, Hiroyuki Kanesugi, Hikaru Ishikawa, Junji Sakata, Koji Takagi, Takayuki Sugimura
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Patent number: 5922250Abstract: A method is provided for manufacturing an optical plastic article formed of a plastic resin composition and having a homogeneous construction and a surface shape within a predetermined dimensional accuracy. A first step includes injection molding melted resin of the plastic resin composition into a mold cavity to produce a primary molding. A second step includes injection molding melted resin of the plastic resin composition which is the same as in the first step over at least a portion of the primary molding to form a secondary molding melt-welded to the primary molding and having the surface shape within the predetermined dimensional accuracy. The secondary molding has a secondary molding maximum thickness less than a limit thickness at which shrinkage exceeds limits of the predetermined dimensional accuracy. The optical plastic article has an optical plastic article thickness defined by the primary molding and the secondary molding greater than the limit thickness.Type: GrantFiled: November 3, 1997Date of Patent: July 13, 1999Assignee: Bridgestone CorporationInventors: Hikaru Ishikawa, Kunio Machida
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Patent number: 4789586Abstract: A vibration damping metal panel having an excellent post-workability is disclosed, which comprises two metal plates and an intermediate layer interposed therebetween and composed mainly of (A) at least one rubbery polymer having .alpha., .beta.-unsaturated carboxylate group in its molecule and (B) a substance selected from polymerizable monomers and mixtures thereof and thermosetting epoxy resins.Type: GrantFiled: June 16, 1987Date of Patent: December 6, 1988Assignee: Bridgestone CorporationInventors: Yasuhiro Morimura, Yukio Fukuura, Hikaru Ishikawa, Itsuo Tanuma, Toshio Honda
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Patent number: 4739002Abstract: Cross-linking type adhesive compositions comprising (A) polymers having .alpha.,.beta.-unsaturated carboxylate groups, (B) materials having polymerizable vinyl groups, which contain an acrylic and/or methacrylic acid, (C) thermoplastic resins and (D) catalysts of organic peroxides and/or photosensitizers. The adhesive compositions have good adhesive properties together with an excellent heat aging resistance, and can be applied for adhesion to organic and inorganic substrates.Type: GrantFiled: June 17, 1986Date of Patent: April 19, 1988Assignee: Bridgestone CorporationInventors: Hikaru Ishikawa, Toshio Honda, Kazuo Naito, Yukio Fukuura
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Patent number: 4707397Abstract: A vibration damping metal panel having an excellent post-workability is disclosed, which comprises two metal plates and an intermediate layer interposed therebetween and composed mainly of (A) at least one rubbery polymer having .alpha.,.beta.-unsaturated carboxylate group in its molecule and (B) a substance selected from polymerizable monomers and mixtures thereof and thermosetting epoxy resins.Type: GrantFiled: May 15, 1985Date of Patent: November 17, 1987Assignee: Bridgestone CorporationInventors: Yasuhiro Morimura, Yukio Fukuura, Hikaru Ishikawa, Itsuo Tanuma, Toshio Honda
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Patent number: 4591618Abstract: An anaerobic adhesive composition comprises a polymer having a polymerizable side chain and a molecular weight of at least 500, an organic acid having a vinyl or methacryl group and polymerizable with said polymer, a polymerization catalyst, and preferably, a vinyl monomer. The composition is used for bonding various adherends such as metals, plastics, FRP, glass, etc. and provides improved bond strength, water resistance, heat resistance, and fatigue resistance.Type: GrantFiled: March 18, 1983Date of Patent: May 27, 1986Assignee: Bridgestone Tire Co., Ltd.Inventors: Kazuo Naito, Tadashi Fuse, Itsuo Tanuma, Yukio Fukuura, Hikaru Ishikawa
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Patent number: 4371411Abstract: An unvulcanized rubber composition, whose rubber component consists of polybutadiene rubber as an essential component and at least one of styrene-butadiene rubber and a rubber of natural rubber and/or polyisoprene rubber, has a high adhesion to a vulcanized rubber composition, whose rubber component consists mainly of at least one rubber selected from natural rubber, polyisoprene rubber, polybutadiene rubber and styrene-butadiene rubber, and can be easily adhered to the vulcanized rubber composition through vulcanization without carrying out particular surface treatment of the vulcanized rubber composition.Type: GrantFiled: September 19, 1980Date of Patent: February 1, 1983Assignee: Bridgestone Tire Company LimitedInventors: Toshio Honda, Yukio Fukuura, Hikaru Ishikawa, Shozo Kojima, Itsuo Tanuma, Masao Ogawa
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Patent number: 4317862Abstract: A sandwich glass having an intermediate layer formed of a photosensitive resin consisting mainly of an acryloyloxy group- or methacryloyloxy group-containing high polymer and at least one of acrylic acid, methacrylic acid and acryloyloxy group- or methacryloyloxy group-containing compound is excellent in the adhesion between the intermediate layer and the glass plates and has high impact absorbing ability, light resistance and heat resistance.Type: GrantFiled: December 28, 1979Date of Patent: March 2, 1982Assignee: Bridgestone Tire Company LimitedInventors: Toshio Honda, Itsuo Tanuma, Masao Ogawa, Hikaru Ishikawa, Yukio Fukuura, Setsuo Akiyama, Shozo Ojima, Kazuo Naito
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Patent number: D308172Type: GrantFiled: June 19, 1987Date of Patent: May 29, 1990Assignee: Pigeon Co., Ltd.Inventors: Hikaru Ishikawa, Takashi Sano