公开(公告)号：US5905610A

公开(公告)日：1999-05-18

申请号：US82895

申请日：1993-06-25

申请人： Terry B. Mitchell ,  William P. Wood ,  Paul F. Michalek

发明人： Terry B. Mitchell ,  William P. Wood ,  Paul F. Michalek

IPC分类号： G11B5/265 ,  G11B5/31 ,  G11B5/39

CPC分类号： G11B5/3925 ,  G11B5/3103 ,  G11B5/3113 ,  G11B5/3903 ,  G11B5/3967

摘要： A combined read/write magnetic head is disclosed in which the read head includes a magnetoresistive element (MRE) overlying a substrate of substantially magnetically impermeable material, a broken (discontinuous) flux guide overlying the MRE and a continuous flux guide overlying the broken flux guide. The write head of the combined read/write magnetic head overlies the read head and shares the continuous flux guide with the read head, the continuous flux guide serving as a bottom pole of the write head. Significantly, the dimensions of the various elements of the combined read/write magnetic head are chosen so that relatively little magnetic flux produced by the write head during writing, or entering the write head during reading, is communicated via the shared flux guide to the MRE.

摘要翻译： 公开了一种组合的读/写磁头，其中读头包括覆盖基本上不可渗透的材料的基片上的磁阻元件（MRE），覆盖在MRE上的断开的（不连续的）磁通引导件，以及覆盖破坏的磁通引导件 。 组合的读/写磁头的写头位于读头，并与读头共用连续的磁通引导件，连续的磁通引导器用作写头的底极。 重要的是，选择组合的读/写磁头的各种元件的尺寸，使得在写入期间由写头产生的或在读取期间进入写头的相对较小的磁通量经由共享磁通引导件传送到MRE 。

公开(公告)号：US5893935A

公开(公告)日：1999-04-13

申请号：US781558

申请日：1997-01-09

申请人： William P. Wood

发明人： William P. Wood

IPC分类号： C04B35/111 ,  C09C1/68 ,  C09K3/14

CPC分类号： C04B35/1115 ,  C09K3/1409

摘要： Method for making alpha alumina-based abrasive grain from a dispersion comprising boehmite, wherein the method involves the impregnation of an alpha alumina-based ceramic precursor material. The abrasive grain can be incorporated into abrasive products such as coated abrasives, bonded abrasives, and non-woven abrasives.

公开(公告)号：US5690707A

公开(公告)日：1997-11-25

申请号：US459548

申请日：1995-06-02

申请人： William P. Wood ,  Henry A. Larmie

发明人： William P. Wood ,  Henry A. Larmie

IPC分类号： C04B35/01 ,  C04B35/111 ,  C09C1/68 ,  C09K3/14

CPC分类号： C09K3/1418 ,  C04B35/01 ,  C04B35/1115 ,  C09K3/1409

摘要： Abrasive grain including manganese oxide therein are provided. The inclusion of manganese oxide can be utilized to reduce the transition temperature of transitional alumina(s) to alpha alumina(s), during the formation of the abrasive grain. Further, manganese oxide presence can be utilized to generate sintered abrasive grain having a submicrometer, faceted microstructure. The abrasive grain are useful in abrasive articles such as coated abrasives, three-dimensional, low density abrasives, and bonded abrasives.

摘要翻译： 提供包括其中的氧化锰的磨料颗粒。 在形成磨料颗粒期间，可以使用包含氧化锰以降低过渡氧化铝到α氧化铝的转变温度。 此外，可以使用氧化锰存在来产生具有亚微米，多面微结构的烧结磨粒。 磨料颗粒可用于磨料制品，如涂层磨料，三维，低密度磨料和粘结磨料。

公开(公告)号：US5282875A

公开(公告)日：1994-02-01

申请号：US44914

申请日：1993-04-08

申请人： William P. Wood ,  Soo C. Yoon

发明人： William P. Wood ,  Soo C. Yoon

IPC分类号： B24D3/14 ,  C04B35/111 ,  C09K3/14

CPC分类号： B24D3/14 ,  C04B35/111 ,  C09K3/1418

摘要： A vitreous bonded abrasive article such as a grinding wheel is provided comprising high density sol-gel alumina-based abrasive grains comprised of alpha alumina and a vitreous bond which binds together the abrasive grains. The grinding wheel of the invention exhibits enhanced G-ratio grinding performance over comparable wheels containing sol-gel alumina-based abrasive grain having a density less than 3.85 grams per cubic centimeter.

摘要翻译： 提供了一种玻璃状粘合磨料制品，例如砂轮，其包括由α氧化铝和玻璃粘结组成的高密度溶胶 - 凝胶氧化铝基磨料颗粒，其将磨料颗粒结合在一起。 本发明的砂轮在具有密度小于3.85克/立方厘米的溶胶 - 凝胶氧化铝基磨料颗粒的相当的轮子上表现出增强的G比磨削性能。

公开(公告)号：US06611167B2

公开(公告)日：2003-08-26

申请号：US10252238

申请日：2002-09-23

申请人： Terrence A. McMahon ,  Ray V. Rigles ,  David M. Gray ,  William P. Wood

发明人： Terrence A. McMahon ,  Ray V. Rigles ,  David M. Gray ,  William P. Wood

IPC分类号： G05F302

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G01R33/07 ,  G11B5/00 ,  G11B5/012 ,  G11B5/3909 ,  G11B5/455 ,  G11B5/4806 ,  G11B11/10532 ,  G11B20/10527 ,  G11B20/1816 ,  G11B2005/0016

摘要： A balanced bi-directional current source is provided, which includes first and second current output terminals, a current control circuit, first and second amplifiers and first and second sense impedances. The current control circuit has a reference input, a feedback input, and a control output, which is based on the reference input and the feedback input. The first amplifier has a first amplifier input, which is coupled to the control output, and a first amplified output. The second amplifier has a second amplifier input, which is coupled to the control output, and a second amplified output, which is inverted relative to the first amplified output. The first sense impedance is coupled in series between the first amplified output and the first current output terminal and has a feedback output which is coupled to the feedback input. The second sense impedance is matched with the first impedance and is coupled in series between the second amplified output and the second current output terminal.

摘要翻译： 提供了平衡双向电流源，其包括第一和第二电流输出端子，电流控制电路，第一和第二放大器以及第一和第二检测阻抗。 电流控制电路具有参考输入，反馈输入和基于参考输入和反馈输入的控制输出。 第一放大器具有耦合到控制输出的第一放大器输入和第一放大输出。 第二放大器具有耦合到控制输出的第二放大器输入和相对于第一放大输出反相的第二放大输出。 第一感测阻抗串联耦合在第一放大输出端和第一电流输出端子之间，并具有耦合到反馈输入端的反馈输出端。 第二感测阻抗与第一阻抗匹配，并且串联耦合在第二放大输出端与第二电流输出端子之间。

公开(公告)号：US5871555A

公开(公告)日：1999-02-16

申请号：US977180

申请日：1997-11-24

申请人： William P. Wood

发明人： William P. Wood

IPC分类号： C04B35/01 ,  C04B35/111 ,  C09C1/68 ,  C09K3/14

CPC分类号： C09K3/1418 ,  C04B35/01 ,  C04B35/1115 ,  C09K3/1409

摘要： Abrasive grain including manganese oxide therein are provided. The inclusion of manganese oxide can be utilized to reduce the transition temperature of transitional alumina(s) to alpha alumina(s), during the formation of the abrasive grain. Further, manganese oxide presence can be utilized to generate sintered abrasive grain having a submicrometer, faceted microstructure. The abrasive grain are useful in abrasive articles such as coated abrasives, three-dimensional, low density abrasives, and bonded abrasives.

摘要翻译： 提供包括其中的氧化锰的磨料颗粒。 在形成磨料颗粒期间，可以使用包含氧化锰以降低过渡氧化铝到α氧化铝的转变温度。 此外，可以使用氧化锰存在来产生具有亚微米，多面微结构的烧结磨粒。 磨料颗粒可用于磨料制品，如涂层磨料，三维，低密度磨料和粘结磨料。

公开(公告)号：US5554265A

公开(公告)日：1996-09-10

申请号：US421543

申请日：1995-04-13

申请人： Peter I. Bonyhard ,  James F. Dolejsi ,  Charles H. Tolman ,  William P. Wood

发明人： Peter I. Bonyhard ,  James F. Dolejsi ,  Charles H. Tolman ,  William P. Wood

IPC分类号： G11B5/31 ,  G11B5/39 ,  G11B5/40 ,  C23C14/34 ,  B05D5/12 ,  G11B5/42

CPC分类号： G11B5/399 ,  G11B5/3903 ,  G11B5/3967 ,  G11B5/313 ,  G11B5/40

摘要： An MR sensor having improved current density distribution, reduced overall resistance and a substantially planar surface is disclosed. The MR sensor includes an MR layer having first and second outer regions and an active region located between the first and second outer regions. A first permanent magnet region is formed upon the first MR layer outer region and defines a first boundary of the MR layer active region. A second permanent magnet region is formed upon the second MR layer outer region and defines a second boundary of the MR layer active region so that a gap region is positioned at least partially between the first and second permanent magnet regions. A spacer layer is formed on the MR layer active region between the first and second permanent magnet regions. A soft adjacent layer is formed in the active region and upon the spacer layer, and, in some preferred embodiments, also at least partially upon the permanent magnet region.

摘要翻译： 公开了具有改善的电流密度分布，降低的总体电阻和基本平坦的表面的MR传感器。 MR传感器包括具有第一和第二外部区域以及位于第一和第二外部区域之间的有源区域的MR层。 第一永磁体区域形成在第一MR层外部区域上并且限定MR层有源区域的第一边界。 第二永久磁铁区域形成在第二MR层外部区域上并且限定MR层有源区域的第二边界，使得间隙区域至少部分地位于第一和第二永磁体区域之间。 在第一和第二永磁体区域之间的MR层有源区上形成间隔层。 在有源区和隔离层中形成软相邻层，并且在一些优选实施例中还至少部分地形成在永磁体区域上。

公开(公告)号：US5516348A

公开(公告)日：1996-05-14

申请号：US453561

申请日：1995-05-26

申请人： Stanley L. Conwell ,  William P. Wood

发明人： Stanley L. Conwell ,  William P. Wood

IPC分类号： B24D3/00 ,  C09C1/68 ,  C09K3/14

CPC分类号： C09K3/1436

摘要： Alpha alumina-based abrasive grain including aluminate platelets. The abrasive grain can be incorporated into abrasive articles such as bonded abrasives (e.g., grinding wheels), coated abrasives, and nonwoven abrasives.

摘要翻译： 包括铝酸盐血小板的α氧化铝基磨料颗粒。 磨料颗粒可以结合到磨料制品中，例如粘合磨料（例如砂轮），涂覆的磨料和非织造磨料。

公开(公告)号：US5514953A

公开(公告)日：1996-05-07

申请号：US437692

申请日：1995-05-09

申请人： Allan E. Schultz ,  Peter K. George ,  William P. Wood ,  Duane C. Phinney ,  Patrick J. Ryan

发明人： Allan E. Schultz ,  Peter K. George ,  William P. Wood ,  Duane C. Phinney ,  Patrick J. Ryan

IPC分类号： G01N27/82 ,  G01R33/09 ,  G11B5/31 ,  G11B5/39 ,  G11B5/455 ,  G01R33/12 ,  H01L43/08

CPC分类号： G11B5/397 ,  G01N27/82 ,  G01R33/09 ,  G01R33/096 ,  G11B5/455 ,  G11B5/3166 ,  G11B5/3189 ,  Y10T29/49004

摘要： A wafer level test structure and method detects multiple magnetic domains and magnetic domain instability in a test magnetic element. The apparatus comprises a first MR sensor designed to be held in a single magnetic domain by shape anisotropy and a second MR sensor having a permanent magnet to hold the element in a single magnetic domain. A circuit connects the first and second MR sensors to detect differences between the changes in resistance between the first and second sensors in the presence of a magnetic field or differences in resistance after the application and release of a magnetic field. The circuit is preferably a balance circuit in which imbalance in the presence of a magnetic field indicates the presence of multiple magnetic domains in at least one of the test sensors. Magnetic domain stability may be tested by applying an external field to disrupt the existing single domain state of the test sensors, and thereafter detecting differences in resistance of the sensors during reversal of the magnetic field.

摘要翻译： 晶圆级测试结构和方法检测测试磁性元件中的多个磁畴和磁畴不稳定性。 该装置包括被设计为通过形状各向异性保持在单个磁畴中的第一MR传感器和具有永磁体以将元件保持在单个磁畴中的第二MR传感器。 电路连接第一和第二MR传感器，以在存在磁场或施加和释放磁场之后的电阻差时检测第一和第二传感器之间的电阻变化之间的差异。 该电路优选地是其中存在磁场的不平衡指示在至少一个测试传感器中存在多个磁畴的平衡电路。 可以通过施加外部场来破坏测试传感器的现有单域状态，然后在磁场反转期间检测传感器的电阻差异来测试磁畴稳定性。

公开(公告)号：US4788167A

公开(公告)日：1988-11-29

申请号：US933014

申请日：1986-11-20

申请人： James P. Mathers ,  William P. Wood

发明人： James P. Mathers ,  William P. Wood

IPC分类号： B24B1/00 ,  B24B37/00 ,  B24D3/00 ,  C01B21/06 ,  C01B21/072 ,  C01B21/082 ,  C04B35/58 ,  C04B35/581 ,  C09K3/14

CPC分类号： C01B21/0726 ,  C01B21/0602 ,  C01B21/0825 ,  C04B35/581 ,  C09K3/1409 ,  C01P2004/10 ,  C01P2004/20 ,  C01P2006/10 ,  C01P2006/80

摘要： A multiphase, microcrystalline, nearly fully dense ceramic composite has grains comprising 0 to 95 volume percent aluminum nitride, 0 to 95 volume percent polytypes of aluminum nitride, 0 to 95 volume percent gamma-aluminum oxynitride, and 5 to 50 volume percent of at least one of titanium nitride, zirconium nitride and hafnium nitride. The composite is useful to prepare a ceramic abrasive grit or article.