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    Process for preparing self-supporting bodies having controlled porosity and graded properties and products produced thereby
    15.
    发明授权
    Process for preparing self-supporting bodies having controlled porosity and graded properties and products produced thereby 失效
    用于制备具有控制的孔隙率和分级性质的自支撑体的方法及其生产的产品

    公开(公告)号：US5098870A

    公开(公告)日：1992-03-24

    申请号：US557332

    申请日：1990-07-23

    申请人： Terry D. Claar ,  William B. Johnson

    发明人： Terry D. Claar ,  William B. Johnson

    IPC分类号： C04B35/65 ,  C04B37/00 ,  C04B37/02 ,  C04B38/06

    CPC分类号： C04B35/58078 ,  B22F7/004 ,  C04B35/58071 ,  C04B35/652 ,  C04B38/06 ,  C22C1/08 ,  C22C29/14 ,  C04B2235/3821 ,  C04B2235/404 ,  C04B2235/5436 ,  C04B2235/77 ,  C04B2235/80 ,  C04B2235/96 ,  C04B2235/963 ,  C22C2001/081 ,  C22C2001/1089

    摘要： This invention relates generally to a novel method of preparing self-supporting bodies and to the novel products made thereby. In its more specific aspects, this invention relates to a method of producing self-supporting bodies having controlled porosity and graded properties and comprising one or more boron-containing compounds, e.g., a boride or a boride and a carbide. The method comprises, in one embodiment, reacting a powdered parent metal, in molten form, with a bed or mass comprising a boron carbide material and, optionally, one or more inert fillers, to form the body. In another embodiment, both of a powdered parent metal and a body or pool of molten parent metal are induced to react with a bed or mass comprising a boron carbide material and, optionally, one or more inert fillers. in addition, combustible additives (e.g., gelatin, corn starch, wax, etc.) can be mixed with the bed or mass comprising a boron carbide material to aid in the porisity producing process. When the self-supporting body of the instant invention is formed while in contact with a previously formed ceramic, metal or composite body, a bond can be formed between the two bodies, thus creating a macrocomposite body.

    摘要翻译： 本发明一般涉及一种制备自支撑体的新方法及其制备的新颖产品。 在其更具体的方面，本发明涉及一种制备具有受控孔隙率和分级特性并且包含一种或多种含硼化合物例如硼化物或硼化物和碳化物的自支撑体的方法。 在一个实施方案中，该方法包括使熔融形式的粉末母体金属与包含碳化硼材料和任选的一种或多种惰性填料的床或物质反应以形成体。 在另一个实施方案中，粉末母体金属和熔融母体金属的母体或池都被诱导与包含碳化硼材料和任选的一种或多种惰性填料的床或物质反应。 此外，可将可燃添加剂（例如明胶，玉米淀粉，蜡等）与包含碳化硼材料的床或物质混合以有助于生产孔的过程。 当本发明的自支撑体在与先前形成的陶瓷，金属或复合体接触的同时形成时，可以在两个体之间形成结合，从而形成大的复合体。

    Endodontic instrument with enlarged chip space and reduced torque strength
    18.
    发明授权
    Endodontic instrument with enlarged chip space and reduced torque strength 有权

    公开(公告)号：US11628042B1

    公开(公告)日：2023-04-18

    申请号：US17688446

    申请日：2022-03-07

    申请人： William B. Johnson

    发明人： William B. Johnson

    IPC分类号： A61C5/42

    摘要： An endodontic instrument of this disclosure has less torque strength but greater flexibility and enlarged chip space compared to the prior art. In embodiments. only two flutes are spiraled about the instrument's length L to form two non-landed cutting edges between D2 and D16, the cutting edges merging to form a land at about D1. The tip end is rounded. The helical angle α increases from the handle end toward the tip end, a number of spirals per unit length being at least two times greater toward the tip end than toward the handle end, a cross-section of the length L consisting of two convex portions intersecting at each cutting edge or a wave-shape having one concave portion and one convex portion intersecting at each cutting edge, the cross-section occupying less total area than would a same size endodontic instrument having a triangular cross-section and providing greater chip space.

    Longitudinally Ground File Having Increased Resistance To Torsional and Cyclic Fatigue Failure
    19.
    发明申请
    Longitudinally Ground File Having Increased Resistance To Torsional and Cyclic Fatigue Failure 有权
    纵向地面文件增加抗扭转和循环疲劳失效

    公开(公告)号：US20130263700A1

    公开(公告)日：2013-10-10

    申请号：US13858526

    申请日：2013-04-08

    申请人： William B. Johnson

    发明人： William B. Johnson

    IPC分类号： A61C5/02

    CPC分类号： A61C5/023 ,  A61C5/42 ,  B24B1/00 ,  B24B19/022 ,  Y10T29/49 ,  Y10T29/49567 ,  Y10T29/49568

    摘要： A method of producing an endodontic file that involves grinding in a plane substantially parallel to the longitudinal axis of a rotating dental instrument blank. By grinding the dental instrument blank in this manner, the torsional strength of the resulting endodontic file is not eroded during its production, thereby providing a file that is less susceptible to breakage during its use.

    摘要翻译： 一种生产牙髓锉的方法，其涉及在基本上平行于旋转牙科仪器坯件的纵向轴线的平面内研磨。 通过以这种方式研磨牙科仪器坯料，所得到的根管锉的扭转强度在其生产期间不被侵蚀，从而提供在其使用期间不易破裂的文件。

    Reciprocal reverse rotation endodontic file
    20.
    发明授权
    Reciprocal reverse rotation endodontic file 有权
    交替反转牙髓文件

    公开(公告)号：US08047842B2

    公开(公告)日：2011-11-01

    申请号：US12193411

    申请日：2008-08-18

    申请人： William B. Johnson

    发明人： William B. Johnson

    IPC分类号： A61C1/02

    CPC分类号： A61C5/42

    摘要： A single use, reciprocal reverse rotation, endodontic file includes a plurality of spaced apart helical flutes with spiraled lands therebetween. The lands have an edge with a positive cutting angle when the file is rotated in one direction and a scraping angle when rotated in the opposite direction. The file provides for sequential rotation of a selected angle in a forward direction followed by rotation of a slightly less angle in a reverse direction. In one embodiment, the cross-sectional area of the flutes is concave polygonal-shaped at a proximal end of the file and square-shaped at the distal end. In another embodiment, the cross-sectional area of the flutes is convex arcuate-shaped, the lands lying normal to the central longitudinal axis of the file. The handle portion of the file may be configured for use in a rotary handpiece or for manual rotation.

    摘要翻译： 单次使用，相互反向旋转，牙根管文件包括多个间隔开的螺旋形凹槽，其间具有螺旋状的平台。 当文件沿相反方向旋转时，文件沿一个方向旋转时具有正切割角度的边缘和刮削角度。 文件提供在向前方向上顺序旋转所选择的角度，然后沿相反方向旋转稍微较小的角度。 在一个实施例中，凹槽的横截面面积在文件的近端处是凹形多边形的，并且在远端处是正方形的。 在另一个实施例中，凹槽的横截面积为凸形的弧形，平面与文件的中心纵向轴垂直。 文件的手柄部分可以被配置为用于旋转手持件或用于手动旋转。