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    • 4. 发明授权
    • Fat bit bar code reader
    • US5665950A
    • 1997-09-09
    • US453434
    • 1995-05-30
    • Bruce E. RottnerKenneth Alan Lindsay, Jr.William Joseph Clare
    • Bruce E. RottnerKenneth Alan Lindsay, Jr.William Joseph Clare
    • G03B27/62G06K7/10G06K7/14G06F17/00
    • G06K7/10851G03B27/6285G06K7/14
    • A reader for reading bar code symbols containing so called "fat bits" arranged on exposed film is described. A strip of film 10 which has one or more frames 11 has a boundary edge 13 with space in which zero, one, or two fat bits 14 is provided for each frame 11. A light source 28 directs light through the boundary edge 13 of the strip 10. A pair of optical sensors 25, 27 receives the light directed through the boundary edge 13. The sensors 25, 27 each output a signal corresponding to the presence or absence of a fat bit to a detector circuit 220. The detector circuit 220 outputs a signal corresponding to the fat bit to a controller 250 as the strip moves between the light source 28 and the sensors 25, 27. An encoder 230 measures the displacement of the strip 10 as it moves, and outputs pulse signals to the controller 250 representative of units of strip 10 displacement. The controller 250, while receiving the output from the detector circuit 220, measures the width of the fat bit 14 by translating the pulse signals from the encoder 230 into signals representative of the width of the fat bit. The presence of valid fat bits is then verified where the measured width of the fat bits is within a certain range indicative of a valid fat bit. The reader also reads the DX code 12 for each frame 11 on edge 13 by outputting signals from the pair of optical sensors 25, 26 to the detector circuit 220 representative of received light directed through the boundary edge 13 corresponding to the DX code 12 bits. The controller 250 then measures the width of each DX code 12 bit in the same manner as fat bits 14 using the pulse signals from encoder 230 while receiving from the detector circuit 220 output indicative of a DX code 12 bit. The measured DX code 12 bit widths are then stored in controller 250 for later decoding. Sensors 25 and 26 are spaced from each other to optimize reading of DX code 12, while sensors 25 and 27 are spaced from each other by less than the minimum width of a fat bit 14. The width of the fat bit 14 is substantially greater than the width of bars representing DX code 12 bits.
    • 9. 发明授权
    • Process and apparatus for the production of low pressure gaseous oxygen
    • 用于生产低压气态氧气的方法和设备
    • US06539748B2
    • 2003-04-01
    • US10059997
    • 2001-10-22
    • Alan Lindsay PrenticeRodney John Allam
    • Alan Lindsay PrenticeRodney John Allam
    • F25J100
    • F25J3/042F25J3/0409F25J3/04103F25J3/04236F25J3/0426F25J3/04412F25J2210/50F25J2215/02F25J2215/50F25J2245/50Y02P20/129Y10S62/913
    • A process and apparatus for the production of low pressure gaseous oxygen (“GOX”) in which compressed and purified feed air (1) is cooled and at least partially condensed in heat exchange means (E1) having a warm end and a cold end and the cooled and at least partially condensed feed air (2) is then distilled in a cryogenic distillation column system (C1, C2). A liquid oxygen (“LOX”) product stream (8) is removed from the column system (C1, C2) and vaporized and warmed by heat exchange (E1) to produce GOX. LOX refrigerant (10) from an external source is used to provide a portion of the refrigeration duty required for the cooling and at least partial condensation of the feed air stream (1). The LOX refrigerant is injected into the heat exchange means (E1) either: (a) at a pressure greater than that of the LOX product entering the heat exchange means (E1); or (b) at a pressure substantially equal to that of the LOX product entering the heat exchange means and at an intermediate point between the warm and cold ends where the temperature of the heat exchange means is above the boiling temperature of the LOX refrigerant.
    • 一种用于生产低压气态氧(“GOX”)的方法和装置,其中压缩和净化的进料空气(1)在热端和冷端的热交换装置(E1)中冷却并至少部分冷凝, 然后将冷却的和至少部分冷凝的进料空气(2)在低温蒸馏塔系统(C1,C2)中蒸馏。 从柱系统(C1,C2)中除去液氧(“LOX”)产物流(8),并通过热交换(E1)蒸发和加热以产生GOX。 来自外部源的LOX制冷剂(10)用于提供冷却和进料空气流(1)的至少部分冷凝所需的部分制冷负荷。 LOX制冷剂被注入到热交换装置(E1)中,或者:(a)压力大于进入热交换装置(E1)的LOX产品的压力; 或(b)的压力基本上等于进入热交换装置的LOX产品的压力,以及在热交换装置的温度高于LOX制冷剂的沸腾温度的温冷端和冷端之间的中间点。