Patents by Inventor Yoshiaki Hisagen
Yoshiaki Hisagen 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: 6033722Abstract: An electrode plate in which electrode active material powder and an electrode mixture layer mainly composed of a thermoplastic binder are held on a conductive substrate is crushed. Then, the crushed materials are mixed with organic solvent so that a coating material made of the crushed electrode is prepared. The coating material made of the crushed electrode is applied to the surface of the conductive substrate so that an electrode is manufactured. As an alternative to this, an electrode mixture coating material made of electrode active material powder, thermoplastic resin and organic solvent is dried so that a solid electrode is obtained. Crushed materials obtained by crushing the solid electrode are mixed with organic solvent so that a coating material made of the crushed electrode is prepared. The coating material made of the crushed electrode is applied to the conductive substrate so that an electrode is manufactured.Type: GrantFiled: March 10, 1998Date of Patent: March 7, 2000Assignees: Sony Corporation, Mitsumaru Chemical Co. Ltd.Inventors: Takeshi Koike, Shigeo Kimura, Setuo Kawagishi, Tsunekazu Terui, Yoshiaki Hisagen
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Patent number: 4443490Abstract: A magnetic recording medium carrying a magnetic layer thereon, the magnetic layer primarily composed of binder and magnetic powder, wherein the binder is composed of an acrylic compound having a plurality of unsaturated bonds in its molecule and a thermoplastic resin in a weight ratio of 80:20 to 20:80, and is hardened under irradiation.Type: GrantFiled: November 18, 1982Date of Patent: April 17, 1984Assignee: Sony CorporationInventors: Kaoru Nakajima, Kunio Kobayashi, Yoshiaki Hisagen
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Patent number: 4368239Abstract: A magnetic recording medium having low friction coefficient and superior in aging characteristics is disclosed. The magnetic recording medium is provided with a lubricant which is strongly bonded to the magnetic recording medium by a bombardment of an electron beam. In one embodiment, the lubricant containing a molecular chain having a lubricating property, and a double bond sensitive to dissociation products such as free radicals are coated on a magnetic layer and then electron beam irradiates the magnetic layer. A radical reaction then occurs causing a covalent bond of the lubricant to the magnetic recording layer.Type: GrantFiled: August 4, 1980Date of Patent: January 11, 1983Assignee: Sony CorporationInventors: Kaoru Nakajima, Kunio Kobayashi, Yoshiaki Hisagen
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Patent number: 4172176Abstract: A magnetic recording medium is formed of a non-magnetic base and a magnetic layer coated thereon and which contains magnetizable particles dispersed in resinous binder and, as a lubricating agent, a 2-ethylhexanoic acid ester of a saturated alcohol having 12 to 20 carbon atoms.Type: GrantFiled: May 22, 1978Date of Patent: October 23, 1979Assignee: Sony CorporationInventors: Toshiro Tanaka, Toshihiko Yamada, Yoshiaki Hisagen
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Patent number: 4156052Abstract: An improved magnetic recording medium comprising a non-magnetic base, and a magnetic layer formed on the non-magnetic base and containing magnetizable particles dispersed in a resinous binder. The magnetic layer includes an isobutylene oligomer in sufficient amounts to function as a lubricating agent for the magnetic recording medium.Type: GrantFiled: February 22, 1978Date of Patent: May 22, 1979Assignee: Sony CorporationInventors: Toshiro Tanaka, Yoshiaki Hisagen
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Patent number: 4131717Abstract: A magnetic recording medium including a non-magnetic base and a magnetic layer thereon which contains and/or is coated with an organopolysiloxane having an average unit with the formula: exhibits(CH.sub.3)(RO).sub.n (R'COO).sub.m SiO.sub.(3-n-m)/2wherein R is a monovalent hydrocarbon group having from 1 to 5 carbon atoms, R' is an aliphatic monovalent hydrocarbon group having from 7 to 17 carbon atoms; n is zero or a positive number, m is a positive number with the proviso that n + m is less than 3 and the number of Si atoms in a molecule of such organopolysiloxane ranges from 2 to 8. Magnetic recording medium containing such organopolysiloxane material exhibit a substantially reduced dynamic friction coefficient and a substantially reduced tendency of the magnetic layer to lose magnetic particles, along with an improved splicing-ability.Type: GrantFiled: May 16, 1977Date of Patent: December 26, 1978Assignee: Sony CorporationInventors: Takayasu Hirano, Yoshiaki Hisagen, Minoru Takamizawa, Hiroshi Yoshioka
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Patent number: 4047232Abstract: A leader tape for a magnetic recording tape having a coating layer consisting of a binder and a white pigment. A surface resistivity of the coating layer is less than 10.sup.12 ohms/sq. and a transmissivity of the leader tape is more than 20 percent.This is a continuation of application Ser. No. 244,421, filed Apr. 17, 1972, now abandoned.Type: GrantFiled: October 6, 1975Date of Patent: September 6, 1977Assignee: Sony CorporationInventors: Yoshiaki Hisagen, Kazuo Hoshi
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Patent number: 4007314Abstract: A magnetic recording medium including a flexible non-magnetic film base and a magnetic layer thereon consisting of magnetizable particles in a resinous binder, the magnetic layer containing or being coated with an organosilicon lubricant compound having the formula:(RCOO).sub.n Si(CH.sub.3).sub.4-nwhere R is a saturated or unsaturated aliphatic group containing from 7 to 17 carbon atoms and n is an integer in the range from 1 to 3. The friction coefficient and the tendency of the powder to come off from the magnetic layer of the magnetic recording medium are reduced.Type: GrantFiled: October 1, 1975Date of Patent: February 8, 1977Assignees: Sony Corporation, Shinetsu Chemical Co., Ltd.Inventors: Shigetaka Higuchi, Yoshiaki Hisagen, Minoru Takamizawa, Masatoshi Takita
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Patent number: 4007313Abstract: A magnetic recording medium including a flexible non-magnetic film base and a magnetic layer thereon which contains and/or is coated with an organosilicon compound having lubricating properties, said compound having the following formula: ##STR1## WHERE R is a saturated or unsaturated aliphatic group having from 7 to 17 carbon atoms and n is an integer from 1 to 3. The static friction coefficient and the tendency of the magnetic layer to shed powder are both substantially reduced in the improved magnetic recording medium of the present invention.Type: GrantFiled: October 1, 1975Date of Patent: February 8, 1977Assignees: Sony Corporation, Shin-Etsu Chemical Co., Inc.Inventors: Shigetaka Higuchi, Yoshiaki Hisagen, Minoru Takamizawa, Masatoshi Takita
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Patent number: 3993846Abstract: A magnetic recording medium having a non-magnetic base and a dispersion of magnetic particles coated thereon. The magnetic layer includes a polyoxyalkylene substituted organosilicic compound to reduce friction and to reduce wear on the magnetic head.Type: GrantFiled: July 17, 1974Date of Patent: November 23, 1976Assignee: Sony CorporationInventors: Shigetaka Higuchi, Yoshiaki Hisagen, Tetsuya Mayuzumi, Masatoshi Tokita