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31. 发明授权

US4141763A Process for production of ferromagnetic powder and apparatus therefor 失效
标题翻译：铁磁粉末生产方法及其设备
公开(公告)号：US4141763A
公开(公告)日：1979-02-27
申请号：US784747
申请日：1977-04-05
申请人： Masashi Aonuma , Yasuo Tamai , Tatsuji Kitamoto , Fumio Kodama
发明人： Masashi Aonuma , Yasuo Tamai , Tatsuji Kitamoto , Fumio Kodama
IPC分类号： B22F9/24 , H01F1/06
CPC分类号： B22F9/24 , H01F1/065
摘要： A process for producing a ferromagnetic powder comprising injecting a stream of an aqueous solution of a metal salt capable of forming a ferromagnetic substance and a stream of solution containing a reducing material for mixing into a reaction chamber such that the two solutions impinge upon one another causing an oxidation-reduction reaction between them to occur, and applying a magnetic field of 50 oe or more to the particles produced by the oxidation-reduction reaction for the period during which the particles become ferromagnetic particles after going through a superparamagnetic state and an apparatus for use in the practice of the above process comprising a reaction vessel, at least one nozzle for injecting each of a solution of a metal salt and a solution containing a reducing material into the reaction vessel and a magnet for producing a magnetic field in the reaction vessel with the nozzles being open to the magnetic field and positioned so that the solution of the metal salt and the solution of the reducing material when injected are mixed.
摘要翻译：一种制造铁磁粉末的方法，包括将能形成铁磁性物质的金属盐的水溶液流和含有还原材料的溶液流混合到反应室中，使得两种溶液彼此撞击导致在它们之间发生氧化还原反应，并且在通过超顺磁性状态的颗粒变成铁磁颗粒的时期之后，对由氧化还原反应产生的颗粒施加50ee或更大的磁场，用于上述方法的实践中，包括反应容器，用于将金属盐溶液和含有还原材料的溶液中的每一个注入反应容器的至少一个喷嘴和用于在反应容器中产生磁场的磁体其中喷嘴对磁场开放并且定位成使得金属盐a的溶液并且当注入时将还原材料的溶液混合。

32. 发明授权

US4059463A Process for producing ferromagnetic powder 失效
标题翻译：生产铁磁粉的工艺
公开(公告)号：US4059463A
公开(公告)日：1977-11-22
申请号：US693669
申请日：1976-06-07
申请人： Masashi Aonuma , Tatsuji Kitamoto , Goro Akashi
发明人： Masashi Aonuma , Tatsuji Kitamoto , Goro Akashi
IPC分类号： B22F9/24 , H01F1/06 , H01F1/02
CPC分类号： H01F1/065 , B22F9/24
摘要： Ferromagnetic powders comprising cobalt and/or nickel are produced by reducing cobalt and/or nickel salts in an aqueous solution containing hypophosphite ions while applying a magnetic field.
摘要翻译：包含钴和/或镍的铁磁粉末通过在施加磁场的同时还原包含次磷酸根离子的水溶液中的钴和/或镍盐来制备。

33. 发明授权

US4678682A Process for producing magnetic recording medium 失效
标题翻译：磁记录介质的制造方法
公开(公告)号：US4678682A
公开(公告)日：1987-07-07
申请号：US496734
申请日：1983-05-20
申请人： Takamitsu Asai , Goro Akashi , Tatsuji Kitamoto , Hiroshi Chikamasa , Tsunehiko Sato
发明人： Takamitsu Asai , Goro Akashi , Tatsuji Kitamoto , Hiroshi Chikamasa , Tsunehiko Sato
IPC分类号： G11B5/845 , B05D3/14
CPC分类号： G11B5/845
摘要： The perpendicular magnetic orientation of a magnetic layer containing platelet-form ferromagnetic particles coated on a web support is effectively performed by passing a web having thereon the coated magnetic layer in an undried state through a magnetic field formed by plural pairs of opposite pole type magnets disposed in the travelling direction of the web with a gap between adjacent pairs of magnets, while supplying drying air through each gap onto the surface of the travelling web to substantially complete the drying of the coated layer while the web is in the magnetic field. A partition may be inserted in each gap so that the lower end of the partition is close to the upper surface of the travelling web to divide the gap into a front section and a back section, and the drying air may be passed through these sections.
摘要翻译：通过使其上具有涂覆的磁性层的卷材在未干燥状态下通过由多对成对的相对极型磁体形成的磁场而使包含在片状载体上的含有片状铁磁颗粒的磁性层的磁性层的垂直磁性取向在相邻成对的磁体之间具有间隙的幅材的行进方向上，同时通过每个间隙将干燥空气提供到行进幅材的表面上，以在幅材处于磁场的同时基本上完成涂覆层的干燥。可以在每个间隙中插入隔板，使得隔板的下端靠近行进网的上表面，以将间隙分成前部和后部，并且干燥空气可以通过这些部分。

34. 发明授权

US4610903A Magneto-optical disk memory 失效
标题翻译：磁光盘存储器
公开(公告)号：US4610903A
公开(公告)日：1986-09-09
申请号：US687300
申请日：1984-12-28
申请人： Masaaki Nomura , Akira Nahara , Tatsuji Kitamoto
发明人： Masaaki Nomura , Akira Nahara , Tatsuji Kitamoto
IPC分类号： G11B11/10 , G11B11/105 , G11B7/24
CPC分类号： G11B11/10582 , Y10S428/90 , Y10T428/26 , Y10T428/268
摘要： A magneto-optical disk memory comprises a magneto-optical recording medium constituted by a flexible substrate, and a recording thin film overlaid on the substrate. The recording thin film is fabricated of an amorphous rare-earth transition metal alloy having the easy axis of magnetization normal to the film surface. The magneto-optical recording medium is sandwiched between two hard supporting disks.
摘要翻译：磁光盘存储器包括由柔性衬底构成的磁光记录介质和覆盖在衬底上的记录薄膜。该记录薄膜由易磁化轴垂直于膜表面的无定形稀土过渡金属合金制成。磁光记录介质夹在两个硬支撑盘之间。

35. 发明授权

US4608093A Ferromagnetic particles with stable magnetic characteristics and method of preparing same 失效
标题翻译：具有稳定磁特性的铁磁颗粒及其制备方法
公开(公告)号：US4608093A
公开(公告)日：1986-08-26
申请号：US771073
申请日：1985-08-30
申请人： Shizuo Umemura , Tatsuji Kitamoto
发明人： Shizuo Umemura , Tatsuji Kitamoto
IPC分类号： G11B5/706 , B22F1/02 , C09D5/23 , C09D7/12 , H01F1/06 , H01F1/09 , C23C8/14
CPC分类号： H01F1/061 , H01F1/09 , Y10S428/90 , Y10T428/2991
摘要： Cobalt-free ferromagnetic particles are disclosed. The particles are comprised of ferromagnetic metal inner cores and an outer oxidized layer. The particles have a saturation magnetization of 60 to 100 emu/g and a coercive force of 500 Oe or more. The outer layer provides a means for stabilizing the magnetic characteristics of the particles at temperatures not higher than 80.degree. C. in air. The particles are produced by gradually oxidizing ferromagnetic metal particles containing no cobalt in oxygen-containing gas such that the surface-oxidized metal particles have a saturation magnetization of 60 to 100 emu/g. The particles provided have good magnetic characteristics which are maintained with the passage of time even when the particles are subjected to adverse temperature and humidity conditions.
摘要翻译：公开了无钴铁磁颗粒。颗粒由铁磁性金属内芯和外部氧化层组成。颗粒的饱和磁化强度为60〜100emu / g，矫顽力为500Oe以上。外层提供了在空气中不高于80℃的温度下稳定颗粒的磁特性的方法。通过在含氧气体中逐渐氧化不含钴的铁磁性金属颗粒，使得表面氧化金属颗粒具有60至100emu / g的饱和磁化强度来制备颗粒。所提供的颗粒具有良好的磁特性，即使当颗粒经受不利的温度和湿度条件时，其也保持随时间的流逝。

36. 发明授权

US4486496A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US4486496A
公开(公告)日：1984-12-04
申请号：US382337
申请日：1982-05-26
申请人： Shin-ichiro Dezawa , Goro Akashi , Tatsuji Kitamoto
发明人： Shin-ichiro Dezawa , Goro Akashi , Tatsuji Kitamoto
IPC分类号： G11B5/70 , C09D5/23 , C09D7/12 , G11B5/02 , G11B5/706 , G11B5/714 , H01F1/11 , G11B5/68 , B32B5/16
CPC分类号： G11B5/706 , G11B5/714 , G11B5/02 , Y10S428/90 , Y10T428/256 , Y10T428/257
摘要： A magnetic recording medium which comprises a non-magnetic support having thereon a magnetic layer containing plate-shaped magnetic particles which have axes of easy magnetization perpendicular to their respective plate planes dispersed in a binder, the magnetic particles each having a multiple magnetic domain structure and having a particle diameter equal to or longer than the recorded effective shortest wavelength.
摘要翻译：一种磁记录媒体，其特征在于，具有非磁性支持体，上述磁性层含有板状磁性粒子，所述磁性粒子具有易分散在粘合剂中的各自平板平面的磁化强度的方向，所述磁性粒子各自具有多个磁畴结构，具有等于或大于所记录的有效最短波长的粒径。

37. 发明授权

US4241368A Magnetic sheet recorder with a magnetic sheet surface treating means 失效
标题翻译：具有磁性片表面处理装置的磁性片材记录器
公开(公告)号：US4241368A
公开(公告)日：1980-12-23
申请号：US24209
申请日：1979-03-27
申请人： Eiichi Tadokoro , Tatsuji Kitamoto
发明人： Eiichi Tadokoro , Tatsuji Kitamoto
IPC分类号： G11B23/50 , G11B3/58 , G11B25/04
CPC分类号： G11B23/505 , G11B23/50 , Y10S15/12
摘要： In a magnetic sheet recorder, a scraping member is mounted in association with a magnetic head to be put into contact with the magnetic layer of a magnetic sheet together with the magnetic head. The scraping member is mounted ahead of the head so as to treat the recording track of the magnetic sheet in advance of the head when the magnetic sheet is rotated. The scraping member removes from the surface of the magnetic layer scratches and dust particles which cause drop-out of the output level.
摘要翻译：在磁片记录器中，刮削构件与磁头相关联地安装，以与磁头一起与磁性片的磁性层接触。刮削构件安装在头部前方，以便当磁片旋转时，在头部之前处理磁片的记录轨迹。刮擦构件从磁性层的表面除去导致输出水平下降的划痕和灰尘颗粒。

38. 发明授权

US4183976A Process of producing a magnetic recording element 失效
标题翻译：制造磁记录元件的工艺
公开(公告)号：US4183976A
公开(公告)日：1980-01-15
申请号：US870146
申请日：1978-01-17
申请人： Yasuyuki Yamada , Tatsuji Kitamoto
发明人： Yasuyuki Yamada , Tatsuji Kitamoto
IPC分类号： G11B5/738 , H01F10/00
CPC分类号： G11B5/738
摘要： A process of producing a magnetic recording element comprising a non-magnetic support having provided thereon a subbing layer and further having provided thereon a magnetic layer comprising a ferromagnetic powder and a binder, in which the non-magnetic support is a biaxially stretched polyester and the subbing layer is formed by coating a coating solution having a solids concentration of about 0.8 to about 5 wt% comprising an amorphous linear saturated polyester resin containing an aromatic dicarboxylic acid, 10 to 50 wt% of a vinylidene chloride addition polymerizable nitrile copolymer based on the polyester resin and an organic solvent mainly composed of methyl ethyl ketone, which comprises coating the subbing solution at a temperature of about 100.degree. C. or below to provide a dry thickness of about 0.03 to about 2.0 .mu.m, drying the coated layer and then coating the magnetic recording layer thereon.
摘要翻译：一种制造磁记录元件的方法，该磁记录元件包括非磁性载体，其上设置有一个底层，并且还设置有包含铁磁性粉末和粘合剂的磁性层，其中非磁性载体是双轴拉伸的聚酯，通过涂布固体浓度为约0.8至约5重量％的涂布溶液，其包含含有芳族二羧酸的无定形线性饱和聚酯树脂，10至50重量％的偏二氯乙烯加成聚合性腈共聚物，基于聚酯树脂和主要由甲基乙基酮组成的有机溶剂，其包括在约100℃或更低的温度下涂覆底层溶液以提供约0.03至约2.0μm的干燥厚度，干燥涂层，然后在其上涂覆磁记录层。

39. 发明授权

US4101948A Method for cleaning flexible magnetic discs 失效
标题翻译：清洁柔性磁盘的方法
公开(公告)号：US4101948A
公开(公告)日：1978-07-18
申请号：US753165
申请日：1976-12-21
申请人： Eiichi Tadokoro , Tatsuji Kitamoto
发明人： Eiichi Tadokoro , Tatsuji Kitamoto
IPC分类号： G11B23/50 , B21B45/02 , G11B25/04
CPC分类号： G11B23/505
摘要： A soft, coarse, porous cleaning sheet 32 is adhered to the upper surface of a flat horizontal base plate 2, and has approximately the same configuration as the base plate. A floppy record disc 9 having a magnetic layer 10 is secured to the spindle 6 of a motor 5, and when the disc is rotated at a "below levitation" speed the layer 10 slidingly engages the cleaning sheet 32 and is scrape dusted clean thereby.

40. 发明授权

US4069164A Process for producing ferromagnetic powder 失效
标题翻译：生产铁磁粉的工艺
公开(公告)号：US4069164A
公开(公告)日：1978-01-17
申请号：US701914
申请日：1976-07-01
申请人： Shin-ichiro Dezawa , Koji Sasazawa , Tatsuji Kitamoto
发明人： Shin-ichiro Dezawa , Koji Sasazawa , Tatsuji Kitamoto
IPC分类号： C01G49/00 , C01G49/02 , C01G49/06 , C01G49/08 , C09D5/23 , C09D7/12 , G11B5/706 , H01F1/11 , G11B5/64
CPC分类号： G11B5/70689 , C01G49/06 , C01G49/08 , G11B5/70673 , C01P2006/42
摘要： In a process for producing ferromagnetic powder which comprises adding an aqueous solution containing Co.sup.+2 ions, with or without another cation or cations, and an alkali solution to a suspension of ferromagnetic iron oxide, and heating the mixture to produce ferromagnetic iron oxide containing the metal provided by such an ion (s), the improvement wherein the heating is carried out in the presence of an oxidizing agent.
摘要翻译：在制备铁磁性粉末的方法中，该方法包括将含有Co +2离子的水溶液（含有或不含有其它阳离子或阳离子）和碱溶液加入到铁磁性氧化铁悬浮液中，并加热混合物以产生含铁由这样的离子提供的金属，其中加热在氧化剂存在下进行。

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