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    • 1. 发明授权
    • Electromagnetic stirring apparatus
    • 电磁搅拌装置
    • US08398297B2
    • 2013-03-19
    • US12540899
    • 2009-08-13
    • F. Allen DettlingBrian K. ClayGordon K. FrancisMatthew K. StonesmithThomas D. Szakas
    • F. Allen DettlingBrian K. ClayGordon K. FrancisMatthew K. StonesmithThomas D. Szakas
    • B01F13/08
    • B01F13/08B01F13/0818B01F13/1013B01F13/1022
    • The stirring apparatus is an electronic design that generates rotating magnetic fields to drive magnetic stir bars within vials placed above the cover of the stirring apparatus. Below the cover is a magnetics board containing multiple vial groups of four air core coils arranged in rectangular patterns. Each vial group has with two pairs of diagonal coils. The coils in each pair are wired in series and have opposite winding directions. Each pair is driven by a different phase of a stepper motor driver. The vial groups are spaced appropriately for placing one vial above each group. The adjacent coils of adjacent vial groups are driven by the same phase and have the same magnetic direction. The cover contains an array of pole standoffs that matches the coil pattern. The hollow center of each air core coil contains at least a portion of one pole standoff.
    • 搅拌装置是一种电子设计,其产生旋转磁场以驱动放置在搅拌装置的盖上方的小瓶内的磁力搅拌棒。 盖子下面是一个含有四个空心线圈的多个小瓶组的磁性板,它们以矩形图案排列。 每个小组组都有两对斜线圈。 每对线圈串联并具有相反的绕组方向。 每对由步进电机驱动器的不同阶段驱动。 小瓶组适当间隔开,以便在每组上方放置一个小瓶。 相邻小瓶组的相邻线圈由相同的相位驱动并具有相同的磁方向。 盖子包含与线圈图案相匹配的极柱支座阵列。 每个空芯线圈的中空中心包含至少一个极杆间隔的一部分。
    • 8. 发明授权
    • Variable rate timing circuit
    • 可变速率定时电路
    • US4370525A
    • 1983-01-25
    • US209886
    • 1980-11-24
    • Gordon K. Francis
    • Gordon K. Francis
    • H04Q11/04H03K17/296H03K21/30
    • H04Q11/04
    • A digital subscriber loop carrier system (FIG. 1) is disclosed in which voice information and supervisory signal information are encoded in pulse code form and multiplexed together into a single digital pulse stream for transmission between a central office location and a remote subscriber location. In order to provide appropriate timing and decoding of the supervisory signals, a multistate timing circuit (FIG. 4) is provided which permits timing a plurality of periods of substantially different durations by enabling different rate clock pulse sources to be applied to the timing counter.
    • 公开了一种数字用户环路载波系统(图1),其中语音信息和监控信号信息以脉冲码形式编码并被多路复用在单个数字脉冲流中,用于在中心局位置和远程用户位置之间传输。 为了提供对监控信号的适当定时和解码,提供了一种多态定时电路(图4),其允许通过使不同的速率时钟脉冲源被施加到定时计数器来定时多个具有基本不同持续时间的周期。