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    Amphoteric surfactants as glass fiber dispersants for the manufacture of uniform glass fiber mats
    3.
    发明授权
    Amphoteric surfactants as glass fiber dispersants for the manufacture of uniform glass fiber mats 失效
    两性表面活性剂作为用于制造均匀玻璃纤维垫的玻璃纤维分散剂

    公开(公告)号：US5407536A

    公开(公告)日：1995-04-18

    申请号：US194538

    申请日：1994-02-10

    申请人： Shafeek Razac ,  Manilal S. Dahanayake ,  James F. Griffin

    发明人： Shafeek Razac ,  Manilal S. Dahanayake ,  James F. Griffin

    IPC分类号： C03C25/24 ,  D21H13/40 ,  D21H21/24

    CPC分类号： D21H21/24 ,  C03C25/246 ,  D21H13/40

    摘要： In accordance with the present invention, there is provided herein improved glass fiber dispersions for making uniform glass fiber mats by the wet-laid process. The well dispersed glass fiber compositions of this invention usually are prepared by mixing chopped glass fiber bundles in water with a small amount of an alkylamidoalkyl sultaine surfactant to disperse the bundles into individual fibers. As a feature of the invention, the dispersions may be formed at relatively high glass fiber consistencies. The resultant dispersions then are used to make very high quality glass fiber mats at high rates of production.

    摘要翻译： 根据本发明，提供了通过湿式成网法制造均匀的玻璃纤维垫的改进的玻璃纤维分散体。 本发明的良好分散的玻璃纤维组合物通常通过将短切玻璃纤维束在水中与少量的烷基酰氨基烷基磺基甜菜碱表面活性剂混合来分散成单个纤维来制备。 作为本发明的特征，分散体可以以相对高的玻璃纤维一致性形成。 然后所得的分散体用于以高生产率制造非常高质量的玻璃纤维垫。

    Audio power amplifier with automatic bias control
    4.
    发明授权
    Audio power amplifier with automatic bias control 失效
    具有自动偏置控制功能的音频功率放大器

    公开(公告)号：US4077013A

    公开(公告)日：1978-02-28

    申请号：US692781

    申请日：1976-06-04

    申请人： Gene S. Morez ,  James F. Griffin

    发明人： Gene S. Morez ,  James F. Griffin

    IPC分类号： H03F1/02 ,  H03F3/30 ,  H03F3/26

    CPC分类号： H03F1/0261 ,  H03F3/3091

    摘要： A power amplifier with an automatic bias control circuit is disclosed. The amplifier includes two complementary Darlington pairs operating in a push-pull mode providing output power. A bias control network including a switching transistor is coupled to the base circuits of the Darlington pairs for controlling the bias current delivered to the pairs. The transistor is switched on and off by a detecting circuit which senses the presence of input signals applied to the amplifier. The bias control network operates to minimize power consumption by the Darlington pairs when no input signal is present and to raise the bias level of the Darlington pairs without distortion in the output signal when an input is applied to the amplifier.

    摘要翻译： 公开了一种具有自动偏置控制电路的功率放大器。 该放大器包括两个以提供输出功率的推挽模式工作的互补达林顿对。 包括开关晶体管的偏置控制网络耦合到达林顿对的基极电路，用于控制传输到对的偏置电流。 晶体管被检测电路接通和关断，该检测电路检测施加到放大器的输入信号的存在。 当没有输入信号时，偏置控制网络用于最小化达林顿对的功率消耗，并且当输入被施加到放大器时，在输出信号中提高达林顿对的偏置电平而不失真。