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53 条记录 (耗时 0.048 秒)

    Citizens band transmitter with overall envelope feedback from antenna coupling filter
    22.
    发明授权
    Citizens band transmitter with overall envelope feedback from antenna coupling filter 失效
    公民频带发射机，具有来自天线耦合滤波器的整体包络反馈

    公开(公告)号：US4181889A

    公开(公告)日：1980-01-01

    申请号：US939466

    申请日：1978-09-05

    申请人： James L. Davis ,  Michael J. Easterwood

    发明人： James L. Davis ,  Michael J. Easterwood

    IPC分类号： H03F3/24 ,  H03G3/20 ,  H04B1/04

    CPC分类号： H03F1/32 ,  H03F1/52 ,  H03F3/24 ,  H03G3/3042 ,  H03F2200/102 ,  H03F2200/451 ,  H03F2200/462 ,  H03F2200/471 ,  H03F2200/99 ,  H04B2001/0433

    摘要： A citizens band transmitter employing negative overall envelope feedback in the final RF stage obtains the feedback signal from a filter in the antenna coupling network which has a phase shift of 90 degrees or an odd multiple thereof at the radio frequency. A pair of detector diodes have their cathodes connected to opposite ends of filter and their anodes connected to a low pass filter to provide an envelope of the higher of the two voltages at either end of the filter in the coupling circuit in negative feedback to the modulating signal.

    摘要翻译： 在最终RF级采用负整体包络反馈的公民频带发射机从天线耦合网络中的滤波器获得反射信号，该滤波器在射频处具有90度的相移或其奇数倍。 一对检测器二极管的阴极连接到滤波器的相对端，并且它们的阳极连接到低通滤波器，以在耦合电路中的滤波器的任一端提供两个电压中较高者的包络，以负调制 信号。

    Masonry corner jig
    23.
    发明授权
    Masonry corner jig 有权

    公开(公告)号：US10364581B2

    公开(公告)日：2019-07-30

    申请号：US16020476

    申请日：2018-06-27

    申请人： James L. Davis

    发明人： James L. Davis

    IPC分类号： E04G21/18 ,  B28D7/04

    摘要： An a masonry corner jig includes a main elongate body including first and second portions extending from a midpoint, the main elongate body forming a plurality of apertures extending a length of the main elongate body at the midpoint; first and second legs; first and second L-shaped plates each defining a central leg bracket; an adjustable grade stake; a metal plate defining a base; first and second legs each including a leg hinge, a leg rod, an adjusting rod, the adjusting rod forming hole through the center of the adjusting rod, an adjusting pin that is sized and configured for engaged passage through the hole of the adjusting rod, a cylinder defining an ankle rod, and a foot plate that is sized and configured for attachment to the first end of the ankle rod.

    Turbine viscometer
    27.
    发明申请
    Turbine viscometer 有权
    涡轮粘度计

    公开(公告)号：US20080105040A1

    公开(公告)日：2008-05-08

    申请号：US11592521

    申请日：2006-11-03

    申请人： Jason D. Bivens ,  James L. Davis

    发明人： Jason D. Bivens ,  James L. Davis

    IPC分类号： G01N11/14

    CPC分类号： G01N11/14 ,  G01N2203/0094 ,  G01N2203/0676

    摘要： A turbine viscometer for measuring the viscosity of fluid flowing through a conduit, such as a pipe or manifold. The viscometer has a viscosity turbine positionable in the pipe or manifold. The viscosity turbine has a central portion and a plurality of blades extending therefrom such that fluid flow does not induce any rotational movement of the viscosity turbine. The viscometer also has a drive device for rotating the viscosity turbine so that fluid drag on the viscosity turbine can be measured to determine the viscosity of the fluid. In one embodiment, the drive device creates a rotational magnetic field around the viscosity turbine so that it is rotated. In a second embodiment, the drive device is a drive turbine connected to the viscosity turbine and rotated by fluid flowing through the pipe or conduit.

    摘要翻译： 涡轮粘度计，用于测量流过诸如管道或歧管的管道的流体的粘度。 粘度计具有可在管道或歧管中定位的粘度涡轮机。 粘度涡轮机具有从其延伸的中心部分和多个叶片，使得流体流动不会引起粘度涡轮机的任何旋转运动。 粘度计还具有用于旋转粘度涡轮机的驱动装置，从而可以测量粘度涡轮机上的流体阻力以确定流体的粘度。 在一个实施例中，驱动装置在粘性涡轮机周围产生旋转磁场，使其旋转。 在第二实施例中，驱动装置是连接到粘度涡轮机并通过流体流过管道或管道而旋转的驱动涡轮机。

    Solder pastes using alcohol blends as rheological aids
    29.
    发明授权
    Solder pastes using alcohol blends as rheological aids 失效
    使用酒精混合物作为流变助剂的焊膏

    公开(公告)号：US4995921A

    公开(公告)日：1991-02-26

    申请号：US521871

    申请日：1990-05-11

    申请人： James L. Davis ,  Robert W. Pennisi ,  Fadia Nounou ,  Bobby D. Landreth

    发明人： James L. Davis ,  Robert W. Pennisi ,  Fadia Nounou ,  Bobby D. Landreth

    IPC分类号： B23K35/36

    CPC分类号： B23K35/36 ,  B23K35/3612

    摘要： Solder paste vehicles using blends of monofunctional and polyfunctional alcohols are described. The blend may have a major portion of a low viscosity, monofunctional alcohol solvent and a minor portion of a high viscosity polyfunctional alcohol thickener. The monohydric solvent has a room temperature viscosity of at least 3 centipoise and from about 3 to 18 carbon atoms and may include such materials as 2-butanol, 1-hexanol, 1-heptanol, 1-octanol, 1-nonanol, 1-dodecanol, 2-ethoxyethanol, 2-(2-ethoxyethoxy)ethanol, 2-(2-butoxyethoxy)ethanol, n-hexadecanol, n-octadecanol, benzyl alcohol and mixtures thereof. The polyalcohol has a room temperature viscosity of between about 26 to about 1500 cp and includes compounds such as 1,2-ethanediol; 1,2-propanediol; 1,3-propanediol; 1,2-butanediol; 1,3-butanediol; 1,4-butanediol; 1,2-pentanediol; 1,5-pentanediol; 2,4-pentanediol; 2,5-hexane-diol; glycerol; 1,2,4-butanetriol; 2,2'-(ethylenedioxy)diethanol; 1,12-dodecane-diol; 1,16-hexanedecanediol and mixtures thereof. These blends give improved solubility of organic acid fluxing agents, provide relatively high viscosities of the solder paste and permit lower amounts of solvent to be used.

    摘要翻译： 描述了使用单官能和多官能醇的共混物的焊膏车辆。 共混物可以具有主要部分的低粘度单官能醇溶剂和少部分高粘度多官能醇增稠剂。 一元溶剂具有至少3厘泊和约3至18个碳原子的室温粘度，并且可以包括如2-丁醇，1-己醇，1-庚醇，1-辛醇，1-壬醇，1-十二烷醇 ，2-乙氧基乙醇，2-（2-乙氧基乙氧基）乙醇，2-（2-丁氧基乙氧基）乙醇，正十六烷醇，正十八烷醇，苄醇及其混合物。 多元醇的室温粘度在约26至约1500cp之间，并且包括化合物如1,2-乙二醇; 1,2-丙二醇 1,3-丙二醇 1,2-丁二醇 1,3-丁二醇 1,4-丁二醇 1,2-戊二醇 1,5-戊二醇 2,4-戊二醇 2,5-己二醇; 甘油 1,2,4-丁三醇; 2,2' - （亚乙二氧基）二乙醇; 1,12-十二烷二醇; 1,6-己二醇及其混合物。 这些共混物提高了有机酸助熔剂的溶解度，提供了较高粘度的焊膏，并允许使用较少量的溶剂。

    Nuclear densometer
    30.
    发明授权
    Nuclear densometer 失效
    核密度计

    公开(公告)号：US4618939A

    公开(公告)日：1986-10-21

    申请号：US513528

    申请日：1983-07-13

    申请人： James L. Davis

    发明人： James L. Davis

    IPC分类号： G01N23/12 ,  G01T1/16

    CPC分类号： G01N23/12

    摘要： A system for quickly indicating changes in density of a flow of material using a radiactive source and detector where the count rate indicative of density is processed for sensing significant changes in the density in the flow of material as distinguished from random changes and for producing an indication of such changes. In one aspect of the invention, a time filter is utilized with an RC circuit and diodes to require a count rate indicative of a significant density change before producing an indication. In another aspect of the present invention the count rate is processed with respect to a predetermined formulation to determine the occurrence of a significant density change in a time frame and for producing an indication when such change occurs.

    摘要翻译： 一种用于使用放射源和检测器快速指示材料流的密度变化的系统，其中处理指示密度的计数率用于感测与随机变化不同的材料流中的密度的显着变化，并用于产生指示 的这种变化。 在本发明的一个方面，利用RC电路和二极管使用时间滤波器，以在产生指示之前要求指示显着的密度变化的计数率。 在本发明的另一方面，相对于预定公式来处理计数率，以确定在时间范围内出现显着的密度变化，并且在发生这种变化时产生指示。