Patents Examined by Holly C Rickman
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Patent number: 9963806Abstract: The invention relates to a thermoplastic polyurethane fibers, and process of making the same, where the described fiber has good dyeability, and in some embodiments, good flame retardant properties. Such fibers are made from a composition that includes (a) a thermoplastic polyurethane itself comprising the reaction product of: (i) one or more polyols, (ii) one or more diisocyanates, (iii) one or more chain extenders, (iv) optionally one or more crosslinking agents, and (v) one or more functional modifiers wherein each said functional modifier is a reaction product of an aminodiol and a Bronsted acid.Type: GrantFiled: October 9, 2013Date of Patent: May 8, 2018Assignee: LUBRIZOL ADVANCED MATERIALS, INC.Inventors: Ravi R. Vedula, Mouh-Wahng Lee, Julius Farkas
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Patent number: 9911447Abstract: A compound of the formula (1), lubricant containing the compound and magnetic disk R1—C6H4O—CH2CH(OH)CH2OCH2—R2—CH2—O—CH2CH(OH)CH2—OC6H4—R1 ??(1) wherein R1 is alkoxyl having 1 to 4 carbon atoms, amino or amido, R2 is —CF2CF2O(CF2CF2CF2O)zCF2CF2— or —CF2CF2CF2O(CF2CF2CF2CF2O)nCF2CF2CF2—, z is a real number of 1 to 15, n is a real number of 0 to 4.Type: GrantFiled: October 9, 2014Date of Patent: March 6, 2018Assignee: MORESCO CORPORATIONInventor: Ryosuke Sagata
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Patent number: 6623873Abstract: A magnetic recording medium includes an underlayer of a nonmagnetic alloy containing chromium and titanium, a magnetic layer of a Co—Cr—Pt—Ta or Co—Cr—Pt—B alloy, and an intermediate layer of a Co—Cr—Pt alloy and being disposed between the underlayer and the magnetic layer, thereby carrying out high-density information recording and reproducing operation.Type: GrantFiled: November 19, 1999Date of Patent: September 23, 2003Assignee: Hitachi, Ltd.Inventors: Yoshibumi Matsuda, Yotsuo Yahisa, Koji Sakamoto, Yuzuru Hosoe, Akira Kato
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Patent number: 6594100Abstract: A method for writing data on a magnetic recording medium includes providing a magnetic recording layer having at least two ferromagnetic films antiferromagnetically coupled together across a nonferromagnetic spacer film, with one of the ferromagnetic films having a greater magnetic moment than the other. A positive write field is applied to a first region to align the moments of both ferromagnetic films with the positive field, and then a negative write field is applied to an adjacent region to align the moments of both ferromagnetic films with the negative field. When the medium is moved away from the write fields, the moment of the ferromagnetic film with the lesser moment in each region flips to be antiparallel to the moment of the other ferromagnetic film in its region. The result is that the adjacent regions become adjacent magnetized domains with the transition between the domains representative of the written data.Type: GrantFiled: July 11, 2001Date of Patent: July 15, 2003Assignee: Hitachi Global Storage Technologies The Netherlands B.V.Inventors: Matthew Joseph Carey, Eric Edward Fullerton, Bruce Alvin Gurney, Hal Jervis Rosen, Manfred Ernst Schabes
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Patent number: 6572988Abstract: A magnetic recording medium has a magnetic recording film in which the magnitude of saturation magnetization Ms(T=5° K) at 5° K and magnitude of saturation magnetization Ms(T=300° K) at 300° K satisfy: Ms(T=300° K)/Ms(T=5° K)≧0.75. The recording medium enables the high-density recording, and a magnetic recording apparatus using this recording medium can yield a sufficiently high reproduction signal level within the operating temperature range of the apparatus.Type: GrantFiled: August 30, 1999Date of Patent: June 3, 2003Assignee: Hitachi, Ltd.Inventors: Nobuyuki Inaba, Kazuetsu Yoshida, Kazusuke Yamanaka, Fumiyoshi Kirino, Masaaki Futamoto
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Patent number: 6562147Abstract: A connecting material, which secures reliable joints without using flux, is disclosed. Soldering is performed using an auxiliary connecting material capable of physically destroying and dispersing an oxide film, which is naturally grown on the surface of a main connecting material such as solder or brazing between two terminals, to realize a reliable solder wetting (a state of the main connecting material being fused and mixed). For an auxiliary connecting material, hydrocarbon such as n-tetradecane (C14H30), for example, can be used. N-tetradecane boils between connection surfaces and cubically expands; energy generated therefrom physically disperses the oxide film and causes a fresh surface to be exposed; solders on both terminals are mixed; and an electrical and mechanical joint is securely achieved. The residue of the auxiliary connecting material is an insulating material, and therefore does not need cleaning.Type: GrantFiled: March 30, 2001Date of Patent: May 13, 2003Assignee: Denso CorporationInventors: Toshihiro Miyake, Koii Kondo, Takashi Kurahashi, Nozomu Okumura, Makoto Takagi
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Patent number: 6548194Abstract: Disclosed is a magnetic recording medium having a laminate structure comprising at least a substrate, a Co alloy bias layer, a soft magnetic layer, and a magnetic recording layer. The direction of residual magnetization of the Co alloy bias layer faces one direction of its radial direction. Also, the perpendicular magnetic recording medium satisfies the relationship given below: Mssoft×(tsoft−40 nm)>Mssoft×40 nm+Msbias×tbias where, tbias denotes the thickness of the cobalt alloy bias layer, Msbias denotes the saturation magnetization of the cobalt alloy bias layer, tsoft denotes the thickness of the soft magnetic layer, which falls within a range of between 40 nm and 200 nm, and Mssoft denotes the saturation magnetization of the soft magnetic layer.Type: GrantFiled: July 31, 2001Date of Patent: April 15, 2003Assignees: Kabushiki Kaisha Toshiba, Showa Denko K.K.Inventors: Takashi Hikosaka, Futoshi Nakamura, Soichi Oikawa, Hiroshi Sakai, Kenji Shimizu
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Patent number: 6544672Abstract: Disclosed is a magnetic recording medium capable of reducing noise and an error rate of the medium. The medium comprises a nonmagnetic substrate; a magnetic layer formed on the surface of the nonmagnetic substrate directly or through a nonmagnetic underlayer; and a protective layer formed on the magnetic layer; wherein the magnetic recording medium satisfies the following relationships: −0.5≦{Hc(1)−Hc(p)}/Hc(1)≦0.3 Hc(1)≧2 kOe 20 G×&mgr;m≦Br(1)×t≦100 G×&mgr;m where Hc(1) indicates a corecivity of the magnetic layer measured in the longitudinal direction; Hc(p) indicates a coercivity of the magnetic layer measured in the perpendicular direction; Br(1) indicates a remanent magnetization of the magnetic layer measured in the longitudinal direction; and “t” indicates a layer thickness of the magnetic layer.Type: GrantFiled: October 3, 2000Date of Patent: April 8, 2003Assignee: Hitachi, Ltd.Inventors: Masaaki Futamoto, Nobuyuki Inaba, Tomoo Yamamoto, Masukazu Igarashi, Yuzuru Hosoe, Akira Ishikawa
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Patent number: 6541104Abstract: A magnetic recording medium has a construction in which on a non-magnetic support member are successively stacked a seed layer made of a non-magnetic material that is mainly composed of Cr, a keeper layer made of an NiFe-type soft magnetic material, an intermediate layer made of a non-magnetic material that is mainly composed of Cr and a recording layer made of a magnetic material that is mainly composed of Co.Type: GrantFiled: March 8, 2001Date of Patent: April 1, 2003Assignee: Fujitsu LimitedInventors: Hideyuki Akimoto, Chiaki Okuyama, Iwao Okamoto
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Patent number: 6537638Abstract: A perpendicular magnetic recording disk has an underlayer structure that causes the magnetic layer to have perpendicular magnetic anisotropy and high signal-to-noise ratio (SNR). The underlayer structure comprises a B2 type body-centered-cubic (BCC) material, such as the binary alloys NiAl, RuAl and RuTi, as an underlayer, and a Ti or TiCr alloy sublayer formed directly on the underlayer. The magnetic layer, such as a CoCrPt alloy, is deposited directly on the sublayer. The magnetic layer has perpendicular magnetic anisotropy due to the sublayer yet excellent SNR because of the smaller grain size of the sublayer material formed directly on the B2 type underlayer.Type: GrantFiled: December 13, 2000Date of Patent: March 25, 2003Assignee: International Business Machines CorporationInventors: Hoa Do, Yoshihiro Ikeda, Yoshiaki Sonobe, Kentaro Takano
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Patent number: 6537684Abstract: A magnetic recording medium for data storage uses a magnetic recording layer having at least two ferromagnetic films exchange coupled together antiferromagnetically across a nonferromagnetic spacer film. In this antiferromagnetically-coupled (AFC) recording layer the magnetic moments of the two ferromagnetic films are oriented antiparallel, and thus the net remanent magnetization-thickness product (Mrt) of the AFC recording layer is the difference in the Mrt values of the two ferromagnetic films. This reduction in Mrt is accomplished without a reduction in thermal stability of the recording medium. The lower ferromagnetic film in the AFC recording layer is a boron-free ferromagnetic CoCr alloy that does not require a nucleation layer between it and the Cr alloy underlayer.Type: GrantFiled: August 4, 2000Date of Patent: March 25, 2003Assignee: International Business Machines CorporationInventors: Mary Frances Doerner, Eric Edward Fullerton, David Thomas Margulies
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Patent number: 6534204Abstract: There is provided a magnetic storage medium capable of recording information at high recording density and also regenerating the information with a high quality of signal (high S/Nm), and in addition contributing to the elongation of a life span of the recorded information. The magnetic storage medium comprises a non-magnetic substrate, a plurality of magnetic recording layers of ferromagnetism formed on the non-magnetic substrate, and a dividing layer of antiferromagnetism for dividing said plurality of magnetic recording layers from one another through intervening between the magnetic recording layer-to-layer.Type: GrantFiled: September 24, 1999Date of Patent: March 18, 2003Assignee: Fujitsu LimitedInventors: Hideyuki Akimoto, Yuki Yoshida, Kenji Sato, Iwao Okamoto
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Patent number: 6534203Abstract: A magnetic recording medium includes an anti-ferromagnetic layer 2 layered on at least one of the opposite major surfaces in a direction along the thickness of a ferromagnetic recording layer 3. It is possible for magnetization in the vicinity of a surface of an anti-ferromagnetic layer 2 facing a ferromagnetic recording layer 3 to be rotated simultaneously with rotation of magnetization of the ferromagnetic recording layer 3. It is also possible for the intensity of exchange coupling between the two layers to be larger than the total magnetic anisotropy of the anti-ferromagnetic layer 2. It is similarly possible for the intensity of the exchange coupling between the two layers to be smaller than the total magnetic anisotropy of the anti-ferromagnetic layer 2 and larger than the magnetic domain energy of the anti-ferromagnetic layer 2.Type: GrantFiled: March 25, 1999Date of Patent: March 18, 2003Assignee: Sony CorporationInventors: Yoh Iwasaki, Minoru Ikarashi, Masafumi Takiguchi
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Patent number: 6511761Abstract: In a magnetic storage apparatus including a recording medium having a magnetic layer, a seed layer and an underlayer formed on a substrate, a driver for driving the recording medium, a magnetic head having an inductive recording head and a magnetoresistive reproducing head, and a signal processing system for processing input signals to the magnetic head and output signals from the magnetic head, the seed layer comprises an amorphous alloy or a microcrystal alloy containing Ni, Ta and Zr, the underlayer comprises an alloy containing Cr as a main component and Ti, and the magnetic layer has a first magnetic layer in contact with the underlayer and a second magnetic layer on the first magnetic layer. The first magnetic layer comprises a Co—Cr—Pt alloy and the second magnetic layer comprises Co—Cr—Pt—B alloy, both of a substantially hexagonal close-packed structure.Type: GrantFiled: September 18, 2000Date of Patent: January 28, 2003Assignee: Hitachi, Ltd.Inventors: Kiwamu Tanahashi, Tetsuya Kanbe, Satoshi Matsunuma, Akira Ishikawa
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Patent number: 6506508Abstract: In a magnetic recording medium including an underlayer made of an anti-ferromagnetic material and a magnetic recording layer made of a material containing cobalt as the principal component that are serially disposed on a non-magnetic substrate, an intermediate layer made of a ferromagnetic material is sandwiched between the underlayer and the magnetic recording layer. A magnetic recording medium capable of providing an improved S/N ratio and high-density recording is provided. A production method for such a magnetic recording medium and a magnetic storage apparatus using the same are also provided.Type: GrantFiled: September 21, 2000Date of Patent: January 14, 2003Assignee: Fujitsu LimitedInventors: Yuki Yoshida, Iwao Okamoto
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Patent number: 6475611Abstract: A multilayer superlattice having a structure with many interfaces of magnetic/non-magnetic layers could increase the coercivity of a magnetic recording medium by increasing the interfacial anisotropy. A Si-containing seedlayer between a soft underlayer and the multilayer superlattice further boosts the coercivity of the magnetic recording medium.Type: GrantFiled: August 7, 2000Date of Patent: November 5, 2002Assignee: Seagate Technology LLCInventor: Ga-Lane Chen
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Patent number: 6465556Abstract: A composition comprising a polymer dispersion wherein said polymer is formed by reacting in the presence of water and in the presence of the reaction product of (i) one or more carboxylic fatty acids; and (ii) ammonia or one or more polyfunctional aromatic or aliphatic amines: (1) one or more ethylenically unsaturated monomers which is capable of polymerizing in an aqueous environment is provided.Type: GrantFiled: June 26, 1998Date of Patent: October 15, 2002Assignee: Rhodia Inc.Inventors: Charles E. Pratt, Paul Jakob, Jon D. Kiplinger
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Patent number: 6465101Abstract: Multilayer plastic composite articles comprise at least one poly (alkylene naphthalate) surface layer which is adherent to at least one surface of a substrate which is formed of a thermoplastic resin. Decorative layers can be located between the substrate and the poly (alkylene naphthalate) surface layers.Type: GrantFiled: April 28, 1998Date of Patent: October 15, 2002Assignee: General Electric CompanyInventors: Amy Kathleen MacGregor, Donald George LeGrand, Sterling Bruce Brown, Kenneth Lee Lilly
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Patent number: 6461750Abstract: A magnetic recording media is formed with high in-plane coercivity employing dual magnetic layers. The first magnetic layer is sputter deposited in a chamber employing a shield such that the minimum incident angle of impinging atoms is relatively large, e.g., greater than about 26°. Embodiments of the present invention comprise depositing a NiAl seedlayer, a Cr or Cr alloy underlayer and a first CoCrTa magnetic layer at a thickness less than about 50Å for inducing the preferred (10.0) crystallographic orientation in the subsequently deposited second magnetic layer, e.g., CoCrPtTa or CoCrPtTaNb having a high Cr content of about 16 to about 21 at. %.Type: GrantFiled: September 28, 1999Date of Patent: October 8, 2002Assignee: Seagate Technology, Inc.Inventors: Qixu (David) Chen, Lin Huang, Charles Leu, Rajiv Yadav Ranjan
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Patent number: 6458473Abstract: A thermal barrier coating system and a method for forming the coating system on a component designed for use in a hostile thermal environment, such as superalloy turbine, combustor and augmentor components of a gas turbine engine. The method is particularly directed to a thermal barrier coating system that includes a thermal insulating ceramic layer and a diffusion aluminide bond coat on which an aluminum oxide scale is grown to protect the underlying surface of the component and to chemically bond the ceramic layer. The bond coat is formed to contain an additive metal of platinum, palladium, rhodium, chromium and/or silicon, and an additive element of yttrium and/or zirconium, with possible additions of hafnium. The bond coat may be formed by codepositing aluminum with the active element, or by depositing the additive metal and active element on the surface of the component, and then aluminizing to form the diffusion aluminide bond coat.Type: GrantFiled: January 21, 1997Date of Patent: October 1, 2002Assignee: General Electric CompanyInventors: Jeffrey A. Conner, Bangalore A. Nagaraj, Joseph A. Heaney, III, Nripendra N. Das, Patricia A. Zomcik, David J. Wortman, David V. Rigney, Jon C. Schaeffer