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    • 3. 发明授权
    • Method for liquid/liquid extraction of molecular weight fractions of perfluorinated polyethers
    • 液/液萃取全氟聚醚分子量分数的方法
    • US07038068B2
    • 2006-05-02
    • US10802164
    • 2004-03-16
    • John M. Burns
    • John M. Burns
    • C07D307/02
    • B01D11/0492C07B63/00C07D305/12
    • A liquid/liquid extraction method is used for separating a perfluorinated polyether (PFPE) into two molecular-weight distributions using an alcohol or cyclic ether as one solvent and a fluorinated solvent as the other solvent. The more polar alcohol or cyclic ether solvent extracts the lower molecular weight PFPE and the less polar fluorinated solvent extracts the higher molecular weight PFPE. In addition, when the PFPE is a mixture of PFPEs with different end groups, such as a mixture of predominantly Z-Tetraol but with other PFPEs with Z-Dol end groups, there is an enrichment of the Z-Tetraol in the more polar solvent. The preferred PFPE is a mixture of PFPEs in as-purchased Z-Tetraol and the preferred solvents are methanol or trifluoroethanol as one solvent and a perfluorinated hydrocarbon, such as perfluorohexane, as the other solvent.
    • 使用液/液萃取方法,使用醇或环醚作为一种溶剂和氟化溶剂作为其它溶剂将全氟聚醚(PFPE)分离成两个分子量分布。 更极性的醇或环醚溶剂提取较低分子量的PFPE,较低极性的氟化溶剂提取较高分子量的PFPE。 此外,当PFPE是具有不同端基的PFPE的混合物,例如主要为Z-四醇的混合物,但与其他具有Z-Dol端基的PFPE的混合物时,Z-四醇在更极性溶剂中的富集 。 优选的PFPE是在购买的Z-四醇中的PFPE的混合物,优选的溶剂是甲醇或三氟乙醇作为一种溶剂,全氟化烃如全氟己烷作为其它溶剂。
    • 4. 发明授权
    • Interference canceling receiver
    • 干扰消除接收机
    • US5729576A
    • 1998-03-17
    • US641452
    • 1996-04-30
    • Wade J. StoneRobert TsoJohn M. Burns
    • Wade J. StoneRobert TsoJohn M. Burns
    • G01S7/36G01S13/75H04B1/10H04L27/156H04L27/14H04B15/04
    • G01S7/36G01S13/758H04B1/10H04L27/156
    • A receiver used in a system having a transmitter (10) that sends an exciting signal to a remote transponder (18) is configured to receive a relatively weak signal from the transponder and to cancel out relatively high level interference from the transmission itself. A received frequency shift keying signal is fed to a tuned amplifier (22) for preliminary analog signal conditioning, and thence fed to an analog to digital converter (24). The output of the analog to digital converter is integrated (26) over a selected number of clock pulses and then dumped into a quarter rate quadrature demodulator (60) that multiplies the integrated signal by the same signal delayed by one clock interval. Undesired artifacts generated in the demodulator (60) are removed by a cascade of comb filters (70), and the demodulated digital output is available as the desired output of the receiver. The several clock signals of the system are all referenced from a basic exciter signal that itself gives rise to the transmitted interference signal so that the interference and all timing signals are approximately synchronous.
    • 在具有向远程转发器(18)发送激励信号的发射机(10)的系统中使用的接收机被配置为从应答器接收相对较弱的信号,并且消除来自传输本身的相对较高级别的干扰。 接收的频移键控信号被馈送到用于初步模拟信号调理的调谐放大器(22),然后馈送到模数转换器(24)。 模数转换器的输出在选定数量的时钟脉冲上积分(26),然后转储成四分之一速率正交解调器(60),该积分解调器将积分信号乘以延迟一个时钟间隔的相同信号。 在解调器(60)中产生的不想要的伪影通过梳状滤波器(70)的级联去除,并且解调的数字输出可用作接收机的期望输出。 系统的几个时钟信号都来自基本的激励器信号,其本身引起发射的干扰信号,使得干扰和所有定时信号近似同步。
    • 5. 发明授权
    • Two quadrants high speed multiplying DAC
    • 两个象限高速倍增DAC
    • US5128674A
    • 1992-07-07
    • US676635
    • 1991-03-28
    • Kam W. KongJohn M. BurnsTim M. Ng
    • Kam W. KongJohn M. BurnsTim M. Ng
    • H03M1/74
    • H03M1/745
    • A multiplying digital-to-analog converter for multiplying a bipolar input current by a digital word A having N bits a.sub.i including a current adder for adding a constant current to the bipolar input current to produce a unipolar current, a first current mirror responsive to the unipolar current for providing N binary weighted versions of the unipolar current, a second current mirror for providing binary weighted versions of the constant current, N current selection circuits respectively controlled the N bits a.sub.i for providing an output current comprising (a) the correspondingly weighted version of said unipolar current if the associated control bit is in a first state or (b) the correspondingly weighted version of the constant current if the associated control bit is in a second state, and a shifting circuit for summing the outputs of said N current selection means and for shifting the sum current to produce a bipolar output current representative of product of (a) the input bipolar current and (b) the digital word A.
    • 一种乘法数模转换器,用于将双极性输入电流乘以具有N位ai的数字字A,其包括用于将恒定电流加到双极性输入电流以产生单极电流的电流加法器,第一电流镜响应于 用于提供单极电流的N个二进制加权版本的单极电流,用于提供恒定电流N个电流选择电路的二进制加权版本的第二电流镜分别控制N个比特ai以提供输出电流,其包括(a)相应的加权版本 如果所述相关联的控制位处于第一状态,或(b)相关联的控制位处于第二状态的恒定电流的对应加权版本,以及用于将所述N个当前选择的输出相加的移位电路, 意味着和移动总和电流以产生代表(a)输入双极光的乘积的双极输出电流 t和(b)数字词A.
    • 7. 发明授权
    • Systems and methods for processing a magnetic disk
    • 用于处理磁盘的系统和方法
    • US08409660B2
    • 2013-04-02
    • US12426767
    • 2009-04-20
    • Charles A. BrownJohn M. BurnsXing-Cai GuoThomas E. KarisBruno Marchon
    • Charles A. BrownJohn M. BurnsXing-Cai GuoThomas E. KarisBruno Marchon
    • B05D3/12
    • G11B5/8408
    • A system and associated methods are described for preparing a magnetic disk for installation within a disk drive system. For example, a polyfunctional lubricant may be mixed with a chemical agent to esterify the polyfunctional lubricant and cap hydroxyl groups of the polyfunctional lubricant. The magnetic disk may then be dip coated with the polyfunctional lubricant and chemical agent mixture. A polishing system then polishes the magnetic disk via an abrasive polishing tape after dip coating the magnetic disk. A portion of the chemical agent is then removed from the magnetic disk to bond a portion of the lubricant to the magnetic disk to prevent the lubricant from interfering with a read/write head when installed within a disk drive system.
    • 描述了用于准备用于安装在磁盘驱动器系统内的磁盘的系统和相关方法。 例如,可以将多官能润滑剂与化学试剂混合以使多官能润滑剂的多官能润滑剂和羟基的封端酯化。 然后可以用多功能润滑剂和化学试剂混合物将磁盘浸涂。 抛光系统然后在浸涂磁盘之后通过磨料抛光带对磁盘进行抛光。 然后将一部分化学试剂从磁盘中取出,将润滑剂的一部分粘合到磁盘上,以防止润滑剂在安装在磁盘驱动器系统中时与读/写头干扰。
    • 8. 发明授权
    • Method and apparatus to improve performance of power plant steam surface condensers
    • 提高发电厂蒸汽表面冷凝器性能的方法和装置
    • US08689443B1
    • 2014-04-08
    • US12807385
    • 2010-09-03
    • John M. BurnsDaniel C. BurnsJeffrey S. BurnsRobert L. Stevens
    • John M. BurnsDaniel C. BurnsJeffrey S. BurnsRobert L. Stevens
    • B21D51/24
    • F28B9/10F28B1/00F28B1/02F28B1/06F28B9/08Y10T29/4935Y10T29/49387
    • The invention apparatus and method is practiced in large steam surface condensers and in one aspect comprises relatively narrow horizontal trays installed between the vertical tube bundles to drain the condensate from the upper bundle around the lower ones and thereby improve the heat transfer coefficient of the lower bundle(s). A second aspect of the invention apparatus comprises relatively narrow horizontal trays installed slightly below the lowest bundle to improve reheating of falling condensate up toward the saturation temperature of the condenser thereby reducing subcooling and the level of dissolved oxygen in that condensate. A third aspect of the invention apparatus comprises a partial hood retrofitted at the top of the central tubesheet air off-take entrance which is a unique element of the starburst/core pipe condenser design to thereby improve the air removal capability and consequently the performance of the condenser.
    • 本发明的装置和方法在大型蒸汽表面冷凝器中实现,并且在一个方面包括安装在垂直管束之间的相对较窄的水平托盘,以从上层围绕下层排出冷凝物,从而提高下束的传热系数 (s)。 本发明装置的第二方面包括稍低于最低束的相对窄的水平托盘,以改善冷凝器向冷凝器的饱和温度升高的再加热,从而减少冷凝物中的过冷和溶解氧的水平。 本发明装置的第三方面包括在中央管板空气取出口的顶部改装的部分罩,其是星爆/芯管冷凝器设计的独特元件,从而提高空气去除能力,从而提高 冷凝器