利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

7 条记录 (耗时 0.062 秒)

    Process for the recovery of dihydroxybiaryl compounds
    2.
    发明申请
    Process for the recovery of dihydroxybiaryl compounds 有权
    二羟基联芳基化合物的回收方法

    公开(公告)号：US20050075519A1

    公开(公告)日：2005-04-07

    申请号：US10680776

    申请日：2003-10-07

    申请人： John Ofori ,  Ben Patel ,  Eric Pressman

    发明人： John Ofori ,  Ben Patel ,  Eric Pressman

    IPC分类号： C07C37/00 ,  C07C37/055 ,  C07C37/18 ,  C07C37/84 ,  C07C29/10

    CPC分类号： C07C37/84 ,  C07C37/055 ,  C07C37/18 ,  C07C37/64 ,  C07C39/235 ,  C07C39/15

    摘要： A method for preparing and isolating dihydroxybiaryl compounds, such as 4,4′-dihydroxybiphenyl, is disclosed. The alkali metal salt of the dihydroxybiaryl compound is protonated with the monohydroxyaryl halide compound initially used in the reductive coupling reaction which produced the alkali metal salt. In addition, the alkali metal salt of the monohydroxyaryl halide compound is produced by the process, which can then be recycled as the base and monohydroxyaryl halide in a further reductive coupling reaction to form the alkali metal salt of the dihydroxybiaryl compound.

    摘要翻译： 公开了一种制备和分离二羟基联芳基化合物如4,4'-二羟基联苯的方法。 二羟基联芳基化合物的碱金属盐用最初用于生成碱金属盐的还原偶联反应中的单羟基芳基卤化合物进行质子化。 此外，单羟基芳基卤化合物的碱金属盐通过该方法制备，然后可以将其作为碱和单羟基芳基卤化物在进一步还原偶联反应中再循环以形成二羟基联芳基化合物的碱金属盐。

    Bromination of hydroxyaromatic compounds
    4.
    发明申请
    Bromination of hydroxyaromatic compounds 有权
    溴化羟基芳族化合物

    公开(公告)号：US20050049440A1

    公开(公告)日：2005-03-03

    申请号：US10650566

    申请日：2003-08-28

    申请人： Ryan Mills ,  John Ofori

    发明人： Ryan Mills ,  John Ofori

    IPC分类号： C07B39/00 ,  C07C37/62 ,  C07C39/27 ,  C07C39/34

    CPC分类号： C07B39/00 ,  C07C37/62 ,  C07C39/27

    摘要： A method for brominating hydroxyaromatic compounds to form products, such as p-bromophenol, is disclosed. The method uses elemental bromine as the brominating agent and comprises contacting a hydroxyaromatic compound with bromine and oxygen in the presence of metal catalyst. Suitable catalysts include elemental copper, copper compounds, and compounds of Group IV-VIII transition metals.

    摘要翻译： 公开了用于溴化羟基芳族化合物以形成产物的方法，例如对溴苯酚。 该方法使用元素溴作为溴化剂，并且包括在金属催化剂存在下使羟基芳族化合物与溴和氧接触。 合适的催化剂包括元素铜，铜化合物和IV-VIII族过渡金属的化合物。

    Potentiometer state sensing circuit
    5.
    发明授权
    Potentiometer state sensing circuit 失效
    电位器状态检测电路

    公开(公告)号：US4987372A

    公开(公告)日：1991-01-22

    申请号：US388197

    申请日：1989-08-01

    申请人： John Ofori-Tenkorang ,  David Otten ,  Leo Casey

    发明人： John Ofori-Tenkorang ,  David Otten ,  Leo Casey

    IPC分类号： G01R27/02

    CPC分类号： G01R27/02

    摘要： A circuit for sensing the state of a potentiometer includes a capacitor that is connected to the potentiometer wiper and that is successively charged by applying a voltage to each end of the potentiometer resistive element. The capacitor is discharged between successive chargings. The times needed to charge the capacitor to a predetermined voltage in each case are used to determine the position of the wiper along the resistive element. The circuit can be connected to a plurality of potentiometers, any one of which can be selected and the wiper position determined. A similar circuit can determine the state of an inductive or capacitive voltage divider.

    摘要翻译： 用于感测电位器状态的电路包括电容器，其连接到电位计擦拭器，并通过向电位器电阻元件的每一端施加电压而连续地充电。 电容器在连续充电之间放电。 在每种情况下，将电容器充电至预定电压所需的时间用于确定擦拭器沿电阻元件的位置。 电路可以连接到多个电位计，其中任何一个可以被选择并且确定了擦拭器位置。 类似的电路可以确定感性或电容分压器的状态。