Patents by Inventor Masao Fujita
Masao Fujita 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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Publication number: 20190287562Abstract: The magnetic recording medium disclosed in the present application includes a non-magnetic support, an undercoat layer, a magnetic layer containing magnetic particles, and a back coat layer. The coercive force Hc of the magnetic layer in the thickness direction at 25° C. is not 4100 oersteds (Oe) or more, and the coercive force Hc of the magnetic layer in the thickness direction at a temperature between 55° C. and 80° C. inclusive is not less than 1200 oersteds (Oe) and not more than 3700 oersteds (Oe).Type: ApplicationFiled: March 13, 2019Publication date: September 19, 2019Applicant: Maxell Holdings, Ltd.Inventors: Shinji KAWAKAMI, Masao FUJITA, Toshio HIROI
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Publication number: 20190269048Abstract: Provided is an electromagnetic-wave absorber that can favorably absorb electromagnetic waves of a plurality of different frequencies in a high frequency band equal to or higher than the millimeter-wave band. The electromagnetic-wave absorber includes an electromagnetic-wave absorbing layer 1 in which a plurality of magnetic layers 1a-1e are stacked, each magnetic layer containing magnetic iron oxide that magnetically resonates at a high frequency in a band equal to or higher than the millimeter-wave band. A value of an anisotropic magnetic field (HA) of the magnetic iron oxide contained in at least one of the magnetic layers is different from that of the magnetic iron oxide contained in another of the magnetic layers.Type: ApplicationFiled: July 19, 2017Publication date: August 29, 2019Applicant: Maxell Holdings, Ltd.Inventors: Masao FUJITA, Toshio HIROI
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Publication number: 20190215994Abstract: Provided is an electric-wave absorbing sheet that can favorably absorb high frequency electric waves in the millimeter-wave band or higher and that has high handleability. The electric-wave absorbing sheet includes a flexible electric-wave absorbing layer 1 that contains a particulate electric-wave absorbing material 1a and a resin binder 1b. The electric-wave absorbing material is a magnetic iron oxide that magnetically resonates at a frequency band equal to or higher than the millimeter-wave band.Type: ApplicationFiled: June 21, 2017Publication date: July 11, 2019Applicant: Maxell Holdings, Ltd.Inventors: Toshio HIROI, Masao FUJITA, Makoto TERASAWA
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Publication number: 20180350398Abstract: A refractive index nL and an attenuation rate kL of a magnetic layer are obtained by irradiating linearly polarized light at an irradiation angle of 70° from a lengthwise direction of the magnetic layer to the surface of the magnetic layer, and a vertical reflectance RL during vertical incidence of the linearly polarized light in the lengthwise direction is obtained based on nL and kL. A refractive index nT and an attenuation rate kT of the magnetic layer are obtained by irradiating linearly polarized light at an irradiation angle of 70° from a width direction of the magnetic layer to the surface of the magnetic layer, and a vertical reflectance RT during vertical incidence of the linearly polarized light in the width direction is obtained from nT and kT. If a variation rate A (%) of RL and RT is A=|RL/RT?1|×100, the relationship A?10% is established.Type: ApplicationFiled: June 4, 2018Publication date: December 6, 2018Applicant: Maxell Holdings, Ltd.Inventors: Shinji KAWAKAMI, Toshio KAWAKITA, Masao FUJITA
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Publication number: 20180182422Abstract: In a magnetic recording medium according to the present invention, if a straight line W having a length of 500 nm and a width of 15 nm is displayed parallel to a width direction of the magnetic layer and a straight line L having a length of 500 nm and a width of 15 nm is displayed parallel to a longitudinal direction of the magnetic layer, the number of magnetic particles that intersect the straight line W is N1, and the number of magnetic particles that intersect the straight line L is N2, then, a relationship of N1/0.5>60 and N2/0.5>60 is established where N1/0.5 is the number of magnetic particles per micrometer obtained by dividing N1 by 0.5 ?m and N2/0.5 is the number of magnetic particles per micrometer obtained by dividing N2 by 0.5 ?m.Type: ApplicationFiled: December 27, 2017Publication date: June 28, 2018Applicant: Maxell Holdings, Ltd.Inventors: Shinji KAWAKAMI, Toshio HIROI, Masao FUJITA
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Patent number: 9767835Abstract: A magnetic recording medium of the present invention is a magnetic recording medium including a non-magnetic substrate; a non-magnetic layer that is formed on one of principal surfaces of the non-magnetic substrate and contains a non-magnetic powder, a binder, and a lubricant; and a magnetic layer that is formed on a principal surface of the non-magnetic layer opposite to the non-magnetic substrate and contains a magnetic powder and a binder. The magnetic powder has an average particle size between 10 nm and 35 nm inclusive. The lubricant is migratable to the magnetic layer and forms a lubricant layer on a surface of the magnetic layer when a pressure is applied to the magnetic layer. When spacing of the surface of the magnetic layer before and after washing the lubricant with n-hexane is measured with a TSA (Tape Spacing Analyzer), the value of the spacing after washing is 3 to 10 nm, and the value of the spacing before washing is 1 to 5 nm smaller than the value of the spacing after washing.Type: GrantFiled: February 26, 2016Date of Patent: September 19, 2017Assignee: HITACHI MAXELL, LTD.Inventors: Kenji Tanaka, Masao Fujita, Sadamu Kuse
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Publication number: 20160180875Abstract: A magnetic recording medium of the present invention is a magnetic recording medium including a non-magnetic substrate; a non-magnetic layer that is formed on one of principal surfaces of the non-magnetic substrate and contains a non-magnetic powder, a binder, and a lubricant; and a magnetic layer that is formed on a principal surface of the non-magnetic layer opposite to the non-magnetic substrate and contains a magnetic powder and a binder. The magnetic powder has an average particle size between 10 nm and 35 nm inclusive. The lubricant is migratable to the magnetic layer and forms a lubricant layer on a surface of the magnetic layer when a pressure is applied to the magnetic layer. When spacing of the surface of the magnetic layer before and after washing the lubricant with n-hexane is measured with a TSA (Tape Spacing Analyzer), the value of the spacing after washing is 3 to 10 nm, and the value of the spacing before washing is 1 to 5 nm smaller than the value of the spacing after washing.Type: ApplicationFiled: February 26, 2016Publication date: June 23, 2016Applicant: HITACHI MAXELL, LTD.Inventors: Kenji TANAKA, Masao FUJITA, Sadamu KUSE
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Patent number: 9311946Abstract: A magnetic recording medium of the present invention is a magnetic recording medium including a non-magnetic substrate; a non-magnetic layer that is formed on one of principal surfaces of the non-magnetic substrate and contains a non-magnetic powder, a binder, and a lubricant; and a magnetic layer that is formed on a principal surface of the non-magnetic layer opposite to the non-magnetic substrate and contains a magnetic powder and a binder. The magnetic powder has an average particle size between 10 nm and 35 nm inclusive. The lubricant is migratable to the magnetic layer and forms a lubricant layer on a surface of the magnetic layer when a pressure is applied to the magnetic layer. When spacing of the surface of the magnetic layer before and after washing the lubricant with n-hexane is measured with a TSA (Tape Spacing Analyzer), the value of the spacing after washing is 3 to 10 nm, and the value of the spacing before washing is 1 to 5 nm smaller than the value of the spacing after washing.Type: GrantFiled: August 16, 2011Date of Patent: April 12, 2016Assignee: HITACHI MAXELL, LTD.Inventors: Kenji Tanaka, Masao Fujita, Sadamu Kuse
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Publication number: 20140371457Abstract: Provided is a production method for a cis-QMF, which has a low environmental burden and is industrially advantageous. Specifically provided is a production method for a cis-type 2-alkylspiro(1,3-oxathiolane-5,3?)quinuclidine hydrochloride, including: reacting a cis-trans isomer mixture of 2-alkylspiro(1,3-oxathiolane-5,3?)quinuclidine with p-nitrobenzoic acid; resolving the resultant product to produce a cis-type 2-alkylspiro(1,3-oxathiolane-5,3?)quinuclidine p-nitrobenzoate; and converting the p-nitrobenzoate into a hydrochloride.Type: ApplicationFiled: August 28, 2014Publication date: December 18, 2014Applicant: DAIICHI SANKYO COMPANY, LIMITEDInventors: Yutaka KITAGAWA, Masao FUJITA, Kumiko OTAYA
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Patent number: 8593754Abstract: A magnetic tape driving apparatus, which does not cause damage to either a magnetic head or a magnetic tape when making transition of the magnetic tape from a stopped state to a running state, when making transition of the magnetic tape from a running state to a stopped state, or when reversing the transportation direction of the magnetic tape, is provided. In a state where any one of a magnetic head and a magnetic tape moves and the other rests (i.e., a state where static friction may occur), such as at the time of starting transportation of the magnetic tape, at the time of stopping the tape in a running state, and at the time of reversing the transportation direction of the magnetic tape, a head displacing portion vibrates the magnetic head under the control by a displacement control portion, and thus no static friction occurs between the magnetic head and the magnetic tape.Type: GrantFiled: May 25, 2011Date of Patent: November 26, 2013Assignee: Hitachi Maxell, Ltd.Inventors: Masao Fujita, Sadamu Kuse
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Publication number: 20130060036Abstract: Provided is a production method for a cis-QMF, which has a low environmental burden and is industrially advantageous. Specifically provided is a production method for a cis-type 2-alkylspiro(1,3-oxathiolane-5,3?)quinuclidine hydrochloride, including: reacting a cis-trans isomer mixture of 2-alkylspiro(1,3-oxathiolane-5,3?)quinuclidine with p-nitrobenzoic acid; resolving the resultant product to produce a cis-type 2-alkylspiro(1,3-oxathiolane-5,3?)quinuclidine p-nitrobenzoate; and converting the p-nitrobenzoate into a hydrochloride.Type: ApplicationFiled: October 21, 2010Publication date: March 7, 2013Applicant: DAIICHI SANKYO COMPANY, LIMITEDInventors: Yutaka Kitagawa, Masao Fujita, Kumiko Otaya
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Patent number: 8383526Abstract: A liquid containing a hydrophilic polymer is applied by spreading or impregnation to a porous sheet comprising paper or a nonwoven fabric containing not less than 30% by weight and not more than 100% by weight of hydrophilic fiber to provide a hydrophilic polymer-processed sheet of which the surface and/or the interior of the porous sheet is filled with the hydrophilic polymer, which is made insoluble to water. This sheet is used as a sheet for a total heat exchanger which has higher conductivity of sensible heat and latent heat than conventional sheet for a total heat exchanger that uses a moisture permeable membrane.Type: GrantFiled: June 4, 2007Date of Patent: February 26, 2013Assignees: Rengo Co., Ltd., Frontier Industrial Co., Ltd.Inventors: Fumio Miyagoshi, Masao Fujita, Hidenao Saito, Hirokuni Tajima, Sadao Odajima
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Patent number: 8159776Abstract: A magnetic tape driving apparatus of the present invention includes a support member for separating a magnetic tape from a magnetic head on at least one of a tape input side and a tape output side of the magnetic head. The support member separates the magnetic tape from the magnetic head at least when a tape driving portion causes the magnetic tape to start running and/or to stop running. With this configuration, the magnetic tape driving apparatus does not suffer from damage to the magnetic head and the magnetic tape when the magnetic tape makes a transition from the stopped state to the running state and vice versa or changes in the running direction.Type: GrantFiled: April 17, 2008Date of Patent: April 17, 2012Assignee: Hitachi Maxell, Ltd.Inventors: Masao Fujita, Sadamu Kuse
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Patent number: 8130463Abstract: A data recording apparatus of the present invention includes a head that records data signals by magnetizing a magnetic tape 10 and a recording control portion that controls the recording operation by causing recording current to flow to the head. The recording control portion controls the operation of the head, so that in the magnetic tape 10, which is direct current demagnetized continuously in the longitudinal direction, a magnetic field is formed intermittently in an opposite direction to the magnetization direction of the direct current demagnetization. Thus, when recording data signals on the magnetic recording medium, it is possible to make the current flowing to the head small and to realize apparatus power consumption reductions, load reductions for the head and circuitry, and reduction in crosstalk noise from the head chip used for writing to the head chip used for reading.Type: GrantFiled: May 28, 2008Date of Patent: March 6, 2012Assignee: Hitachi Maxell, Ltd.Inventors: Masao Fujita, Kenji Tanaka, Sadamu Kuse
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Publication number: 20120045664Abstract: A magnetic recording medium of the present invention is a magnetic recording medium including a non-magnetic substrate; a non-magnetic layer that is formed on one of principal surfaces of the non-magnetic substrate and contains a non-magnetic powder, a binder, and a lubricant; and a magnetic layer that is formed on a principal surface of the non-magnetic layer opposite to the non-magnetic substrate and contains a magnetic powder and a binder. The magnetic powder has an average particle size between 10 inn and 35 nm inclusive. The lubricant is migratable to the magnetic layer and forms a lubricant layer on a surface of the magnetic layer when a pressure is applied to the magnetic layer. When spacing of the surface of the magnetic layer before and after washing the lubricant with n-hexane is measured with a TSA (Tape Spacing Analyzer), the value of the spacing after washing is 3 to 10 nm, and the value of the spacing before washing is 1 to 5 nm smaller than the value of the spacing after washing.Type: ApplicationFiled: August 16, 2011Publication date: February 23, 2012Inventors: Kenji TANAKA, Masao Fujita, Sadamu Kuse
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Patent number: 8081559Abstract: The present invention provides a recording and reproducing apparatus that can perform high-precision tracking servo control by removing noise from detected servo signals. The recording and reproducing apparatus performs tracking servo control while reading servo signals 10 that are formed on a surface 9 of a recording medium 2 so as to produce optical contrast, the apparatus including a modulated irradiator 20 for irradiating the servo signals 10 with a light beam, the intensity of the light beam being modulated by a modulating wave that is frequency-modulated; a photoelectric converter 30 for converting reflected light from the servo signals 10 into electric signals; and a synchronous demodulator 15 for subjecting the electrical signal to synchronous demodulation using the modulating wave as a reference wave.Type: GrantFiled: December 19, 2007Date of Patent: December 20, 2011Assignee: Hitachi Maxell, Ltd.Inventors: Masao Fujita, Kenji Tanaka, Shinji Kawakami, Sadamu Kuse
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Publication number: 20110292539Abstract: A magnetic tape driving apparatus, which does not cause damage to either a magnetic head or a magnetic tape when making transition of the magnetic tape from a stopped state to a running state, when making transition of the magnetic tape from a running state to a stopped state, or when reversing the transportation direction of the magnetic tape, is provided. In a state where any one of a magnetic head and a magnetic tape moves and the other rests (i.e., a state where static friction may occur), such as at the time of starting transportation of the magnetic tape, at the time of stopping the tape in a running state, and at the time of reversing the transportation direction of the magnetic tape, a head displacing portion vibrates the magnetic head under the control by a displacement control portion, and thus no static friction occurs between the magnetic head and the magnetic tape.Type: ApplicationFiled: May 25, 2011Publication date: December 1, 2011Inventors: Masao FUJITA, Sadamu Kuse
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Patent number: 8068308Abstract: In the apparatus and method of the invention, a servo signal reproduction unit generates a PES from a servo signal reproduced from a magnetic tape, and a frequency conversion unit performs FFT processing of the PES to generate frequency component information. Then, a filter value generation unit generates filter values based on the frequency component information and writes these to a memory. When recording various data signals to the magnetic tape, the filter values are read from the memory and a control filter serving as a notch filter is incorporated into a feedback control for a tracking servo. This enables periodic and narrow-band noise to be removed from a PES, consequently reducing PESs. Accordingly, learning-type optimum notch filter control that allows a magnetic head to follow recording tracks at high speed and with high precision is possible even when the recording track width is reduced and the tape speed is increased.Type: GrantFiled: June 2, 2009Date of Patent: November 29, 2011Assignee: Hitachi Maxell, Ltd.Inventors: Masao Fujita, Shinji Kawakami, Toshio Kawakita, Sadamu Kuse
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Patent number: 8027115Abstract: A data recording apparatus and a data recording system of the present invention includes buffer memories 2a to 2c that accumulate data in a plurality of channels transferred from an external appliance on a channel basis, a data selector 3 that reads the data accumulated in the buffer memories 2a to 2c, and a data drive 4 that records the data read by the data selector 3 onto a magnetic tape, wherein the data selector 3 selectively reads the data accumulated in the buffer memories 2a to 2c, and outputs the data in an order of recording onto a magnetic tape in the tape drive 4. According to such a configuration, a data recording apparatus that can be realized at low cost and a recording system using the data recording apparatus can be provided.Type: GrantFiled: June 13, 2008Date of Patent: September 27, 2011Assignee: Hitachi Maxell, Ltd.Inventors: Masao Fujita, Kenji Tanaka, Sadamu Kuse
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Patent number: 7994344Abstract: A process for producing an optically active compound represented by formula (4) or a salt thereof: the process including reacting a cyclization reagent with an optically active compound represented by formula (3) or its salt: optionally in the presence of a Lewis acid, to form the compound of formula (4) or its salt, wherein, in the compounds of formula (3) and formula (4) and their salts, R1 is a protecting group, and wherein the cyclization reagent is prepared from a titanium (IV) reagent and an alkylmetal compound.Type: GrantFiled: April 24, 2009Date of Patent: August 9, 2011Assignee: Daiichi Sankyo Company, LimitedInventors: Masao Fujita, Yutaka Kitagawa, Makoto Muto