Patents Represented by Attorney R. Hutter

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  • Photogate sensor with improved responsivity
    Patent number: 5909041
    Abstract: A depleted-gate photosensor, or photogate, structure includes a polysilicon layer disposed over a silicon substrate. The polysilicon layer occupies only a portion of each exposure area of the substrate, and is preferably in the form of a ring around the exposure area. By having a portion of the exposure area not covered by the polysilicon, the blue-light-attenuation effects of a polysilicon layer are reduced.
    Type: Grant
    Filed: November 21, 1997
    Date of Patent: June 1, 1999
    Assignee: Xerox Corporation
    Inventors: Paul A. Hosier, Jagdish C. Tandon, Scott L. Tewinkle
  • Ink-jet printhead with on-chip selection of print modes
    Patent number: 5907331
    Abstract: An ink-jet printhead chip in which digital image data is submitted to circuitry on a printhead, "mode signals" are periodically loaded into the printhead circuitry along with the image data. The mode signal can determine which of a plurality of subsets of ejectors in the printhead are to be activated at any given time. By iteration or manipulation of these mode signals, various specific print-quality techniques, such as entering a "draft mode" or altering the order of ejector activation across the array, can be carried out.
    Type: Grant
    Filed: February 24, 1997
    Date of Patent: May 25, 1999
    Assignee: Xerox Corporation
    Inventor: Roger G. Markham
  • System for converting color image signals having high-frequency components from RGB to CMY color spaces
    Patent number: 5900952
    Abstract: A system for converting original RGB color signals to CMY signals includes the step of separating color signals from the original image into low-frequency and high-frequency components. The low-frequency components are converted to CMY signals via a look-up table reflective of a non-linear algorithm, while the high-frequency components are converted to CMY signals according to linear algorithms. The technique avoids color distortion caused by high-frequency noise, such as from halftone screens, in the original image.
    Type: Grant
    Filed: October 15, 1996
    Date of Patent: May 4, 1999
    Assignee: Xerox Corporation
    Inventor: Zhigang Fan
  • Color mixing and color system for use in a printing machine
    Patent number: 5899605
    Abstract: A system for determining, in real time, the precise color measurements of a colorant being applied in a printing apparatus, the colorant being a combination of two or more primary colorants. Light from a light source is transmitted through or reflected from the colorant mixture, and received by a sensor having a relatively small number of photodetectors, each photodetector having a different translucent primary-color filter thereon. Various special algorithms can be used to approach the accuracy of a spectrophotometer using a relatively simple light sensor.
    Type: Grant
    Filed: June 8, 1998
    Date of Patent: May 4, 1999
    Assignee: Xerox Corporation
    Inventors: Edward B. Caruthers, Jr., R. Enrique Viturro
  • System for printing color images with extra colorants in addition to primary colorants
    Patent number: 5892891
    Abstract: In a "hi-fi" color printing system, wherein colorants of hi-fi colors beyond the regular CMYK primary colorants are available, a main gamut obtainable with the CMYK colorants only is mutually exclusive with at least one extended gamut in which a hi-fi colorant is used and a complementary one of the CMY colorants is excluded. Because the main and extended gamuts are mutually exclusive, no more than four colorants are used in any part of the image, and no more than four halftone screens need be used to obtain any desired color.
    Type: Grant
    Filed: November 20, 1996
    Date of Patent: April 6, 1999
    Assignee: Xerox Corporation
    Inventors: Edul N. Dalal, Thyagarajan Balasubramanian, R. Victor Klassen
  • Ink jet printhead with channels formed in silicon with a (110) surface orientation
    Patent number: 5870123
    Abstract: In an ink-jet printhead, the individual channels for ejecting ink onto a print medium are orientation dependently etched along the (111) planes perpendicular to the (110) surface orientation of a single crystal silicon wafer. The silicon wafer is bonded on a glass substrate to act as both a support and an etch stop in the etching process. The orientation of the channels within the silicon layer facilitates channels which are rectangular in cross section.
    Type: Grant
    Filed: July 15, 1996
    Date of Patent: February 9, 1999
    Assignee: Xerox Corporation
    Inventors: Robert V. Lorenze, Jr., James F. O'Neill
  • System for printing color images with extra colorants in addition to primary colorants
    Patent number: 5870530
    Abstract: In a "hi-fi" color printing system, wherein colorants of secondary colors beyond the regular CMYK primary colorants are available, the colorants of the secondary colors are substituted for combinations of the primary colorants in order to obtain a full color gamut. The functions by which colorants of the secondary colors are substituted for primary colorant are non-linear through a path in the color space.
    Type: Grant
    Filed: September 27, 1996
    Date of Patent: February 9, 1999
    Assignee: Xerox Corporation
    Inventor: Raja Balasubramanian
  • Thermal ink jet printhead with pentagonal ejector channels
    Patent number: 5867192
    Abstract: In an ink-jet printhead, channels in which liquid ink is nucleated by a heating element defines five sides in cross-section. One of the sides is created by the main surface of a heater chip which includes the heating element, while the other four sides, forming a truncated parallelogram or diamond-shape, are defined in a channel plate abutting the heater chip. The four-sided channel in the channel plate is created by a combined process of plasma etching and wet etching.
    Type: Grant
    Filed: March 3, 1997
    Date of Patent: February 2, 1999
    Assignee: Xerox Corporation
    Inventors: David A. Mantell, Eric Peeters, James F. O'Neill
  • Real-time image data access from virtual memory in a digital printing system
    Patent number: 5860143
    Abstract: In a real-time printing system, in which large blocks of digital data corresponding to page images must be located in a memory via a translation table and accessed from the memory within a very narrow time frame, the memory-management internal program of an operating system is overridden by external instructions which lock the translation table in memory.
    Type: Grant
    Filed: June 3, 1996
    Date of Patent: January 12, 1999
    Assignee: Xerox Corporation
    Inventors: David Plakosh, Juan A. Romano, Frederic J. Stann, Michael A. Wiegand, Norman E. Wright, Mark A. Smith, Steven E. Chen, Michael C. Lacagnina
  • Using encoding cost data for segmentation and background suppression in JPEG-compressed images
    Patent number: 5854857
    Abstract: An enhancement to the standard JPEG image data compression technique includes a step of recording the length of each string of bits corresponding to each block of pixels in the original image at the time of compression. The list of lengths of each string of bits in the compressed image data is retained as an "encoding cost map" or ECM. The ECM, which is considerably smaller than the compressed image data, can be transmitted or retained in memory separate from the compressed image data along with some other accompanying information and is used as a "key" for editing or segmentation of the compressed image data. The ECM, in combination with a map of DC components of the compressed image, can also be used for substituting background portions of the image with blocks of pure white data, in order to compress certain types of images even further.
    Type: Grant
    Filed: September 26, 1996
    Date of Patent: December 29, 1998
    Assignee: Xerox Corporation
    Inventors: Ricardo L. de Queiroz, Reiner Eschbach
  • Thermal ink-jet printhead with a suspended heating element in each ejector
    Patent number: 5851412
    Abstract: In a thermal ink-jet printhead, a set of heating elements are formed in the main surface of a semiconductor chip. Channels are formed by etching within the semiconductor chip underneath each of the heating elements, thereby exposing two main sides of each heating element within each ejector. Because two main surfaces of the heating element are accessible to liquid ink in each ejector, efficiency and thermal characteristics of the printhead are improved.
    Type: Grant
    Filed: September 15, 1997
    Date of Patent: December 22, 1998
    Assignee: Xerox Corporation
    Inventor: Joel A. Kubby
  • Prioritized data transfer through buffer memory in a digital printing system
    Patent number: 5848226
    Abstract: A system for retrieving data representative of individual page images to be printed from a disk drive utilizes a priority system in which individual software entities within the printing apparatus compete for functional access to the hard-drive memory. Different elements, such as the decomposer, and other software entities within the control system are assigned priorities, and commands from the various elements and software entities are executed by the control system in order of the priority of their sources.
    Type: Grant
    Filed: June 3, 1996
    Date of Patent: December 8, 1998
    Assignee: Xerox Corporation
    Inventors: Steven E. Chen, Michael C. Lacagnina
  • Compression of image data with retaining cost data for each compressed image block
    Patent number: 5838831
    Abstract: An enhancement to the standard JPEG image data compression technique includes a step of recording the length of each string of bits corresponding to each block of pixels in the original image at the time of compression. The list of lengths of each string of bits in the compressed image data is retained as an "encoding cost map" or ECM. The ECM, which is considerably smaller than the compressed image data, can be transmitted or retained in memory separate from the compressed image data along with some other accompanying information and is used as a "key" for editing or segmentation of the compressed image data.
    Type: Grant
    Filed: September 26, 1996
    Date of Patent: November 17, 1998
    Assignee: Xerox Corporation
    Inventor: Ricardo L. de Queiroz
  • Pixel exposure control for a raster output scanner in an electrophotographic printer
    Patent number: 5835121
    Abstract: In a raster output scanning apparatus including a laser diode adapted to output a writing beam, a reflex circuit controls the laser diode. A sensor diode is positioned to receive a portion of light flux from the laser diode while the laser diode emits the writing beam to expose one pixel area on a photosensitive surface. An accumulator associated with the sensor diode accumulates charge created by the sensor diode resulting from light flux from the laser diode. A comparator associated with the accumulator monitors charge accumulated on the accumulator and arrests the source of light flux when the charge accumulated on the accumulator reaches a predetermined threshold level.
    Type: Grant
    Filed: April 21, 1995
    Date of Patent: November 10, 1998
    Assignee: Xerox Corporation
    Inventors: Frank C. Genovese, James W. Lannom
  • System for balancing CPU demands in a high-volume print server
    Patent number: 5825991
    Abstract: A high-volume digital print service has a plurality of independent and simultaneously-operable decomposers which each output decomposed image data to a common buffer. The decomposed data can be compressed for relatively long-term retention in the buffer, by means of a compression element. All of the decomposers and the compression element are operated by a central CPU facility. A control system, sensitive to the amount of data in the buffer at a given time, apportions CPU cycles among the decomposers and compression element for optimization of the entire print service. The control system can also command printing hardware to skip pitches on an imaging surface therein, in order to reduce demand for decomposed data.
    Type: Grant
    Filed: October 30, 1995
    Date of Patent: October 20, 1998
    Assignee: Xerox Corporation
    Inventors: David Plakosh, Michael A. Wiegand, Norman E. Wright
  • Method and materials, including polybenzoxazole, for fabricating an ink-jet printhead
    Patent number: 5820771
    Abstract: An ink-jet printhead fabrication technique enables capillary channels for liquid ink to be formed with square or rectangular cross-sections. A sacrificial layer is placed over the main surface of a silicon chip, the sacrificial layer being patterned in the form of the void formed by the desired ink channels. A permanent layer, comprising a polybenzoxazole, is applied over the sacrificial layer. After polishing the two layers to form a uniform surface, the sacrificial layer is removed.
    Type: Grant
    Filed: November 17, 1997
    Date of Patent: October 13, 1998
    Assignee: Xerox Corporation
    Inventors: Cathie J. Burke, Mildred Calistri-Yeh
  • Fuser subsystem module for an electrophotographic printer which pivots open for jam clearance
    Patent number: 5822668
    Abstract: A fuser subsystem module for an electrophotographic printer or copier pivots open to allow access to the fuser nip and the stripper finger area. Mechanisms in the module cause the sharp stripper fingers to retract when the module is opened, and also enable a stripper plate against the pressure roll to be properly oriented against the pressure roll when the module is closed.
    Type: Grant
    Filed: April 11, 1997
    Date of Patent: October 13, 1998
    Assignee: Xerox Coporation
    Inventors: Paul M. Fromm, Angelo L. Barisone
  • Operation scheduling system for a digital printing apparatus, using a table of executed operations to revise a schedule in real time
    Patent number: 5812273
    Abstract: In a system for scheduling a sequence of operations in an apparatus for outputting, for example, simplex and duplex digitally-printed documents, a schedule is derived for obtaining a desired output order of documents, and this schedule is proposed to the apparatus in real time. As individual operations are accepted for execution by the apparatus, the accepted operation is recorded in an execution table. If a proposed operation is rejected by the apparatus, the execution table can be used to revise the schedule quickly to take into account the rejected operation while still obtaining the desired output order.
    Type: Grant
    Filed: January 21, 1997
    Date of Patent: September 22, 1998
    Assignee: Xerox Corporation
    Inventors: John H. Conley, Markus P. J. Fromherz, Susan B. Layer
  • Reflective test patches for translucent color filters in photosensitive semiconductor chips
    Patent number: 5808297
    Abstract: Semiconductor chips for use in a chip array assembly for scanning of hard-copy images include rows of photosensors, each row of photosensors having a polyimide filter layer for passing one primary color. In addition to the photosensors, a reflective area is provided on the chip, with filter portions provided on the reflective area. The filter portions are created at the same time as the filter layers placed on the photosensors. The filter layers disposed on the reflective area can be used as test sites for determining the light transmissivity of the filter layers on the photosensors.
    Type: Grant
    Filed: July 22, 1996
    Date of Patent: September 15, 1998
    Assignee: Xerox Corporation
    Inventors: Josef E. Jedlicka, Brian T. Ormond
  • Method and apparatus for testing a connection between digital processing modules, such as in digital printing
    Patent number: 5809226
    Abstract: The physical integrity of a large-scale hardware connection between two modules, such as in the context of high-speed digital printing, is tested by entering a diagnostic mode in which single-instruction handshake routines are repeatedly sent from one module to another through a parallel bus. Each handshake routine activates all of the communication lines in the bus. If a sending module does not receive the expected response to the single-instruction handshake routine within a predetermined time, the sending module causes an audible signal to be emitted. Service personnel can manually manipulate various cables, connectors, and sockets forming a hardware connection while the system is in diagnostic mode, to isolate the location of a hardware fault.
    Type: Grant
    Filed: April 12, 1996
    Date of Patent: September 15, 1998
    Assignee: Xerox Corporation
    Inventors: Steven W. Baldwin, William M. OuYang, James R. York, Wayne Cheng, Ronald E. McGarvey, Ana M. Perez, Carolina Creus, Vernon W. Ulrich