Patents Represented by Attorney Franklyn C. Weiss
  • Patent number: 4788116
    Abstract: Method and apparatus for full-color reproduction of a continuous tone color picture or scene using multiple diffraction gratings and masking techniques. A properly photosensitized media, containing regular arrays of multiple diffraction gratings (70), is first created using computer-generated masks and an interferometric recording technique. This plate is referred to as the "white grating canvas" master or WGC master. Reflective and/or transmissive replicas of the WGC master are then created. For the reproduction of each unique scene, one of these WGC replicas is selectively masked in order to leave only certain gratings or portions thereof active. Photographic or xerographic means are two possible ways in which the masking might be accomplished. The selective masking of the WGC itself, or an intermediate material which is then laminated in registration with the WGC, is done in such a way as to reproduce the primary color components in the original scene when properly illuminated and viewed.
    Type: Grant
    Filed: March 31, 1986
    Date of Patent: November 29, 1988
    Assignee: Xerox Corporation
    Inventor: Eric B. Hochberg
  • Patent number: 4780670
    Abstract: An active probe card for high resolution/low noise wafer level testing wherein integrated circuits, such as charge coupled device imagers are tested at the wafer level before initial packaging. The probe card contains active logic and power circuits thereon with improved pin probe needles to reduce noise and distortion. The edge card connectors are eliminated and standard connectors would be used. In addition, the output signal is buffered on the probe card to reduce the effects of loading caused by the patch cable and the measuring instrument.
    Type: Grant
    Filed: March 4, 1985
    Date of Patent: October 25, 1988
    Assignee: Xerox Corporation
    Inventor: Robert S. Cherry
  • Patent number: 4780732
    Abstract: This invention relates to electro-optic line printers and, more particularly to dual region TIR (total internal reflection) modulators. An electro-optical modulator is disclosed wherein the driving electrodes are implemented in two offset, but connected, sections to effectively double the output resolution of the modulator. Longitudinally displaced, laterally staggered electrode arrays are used to produce the laterally staggered fringe field patterns. Since the impinging light beam will defocus while being deflected, means are provided to focus the beam into first and second interaction regions being addressed.
    Type: Grant
    Filed: March 21, 1988
    Date of Patent: October 25, 1988
    Assignee: Xerox Corporation
    Inventor: Igor Abramov
  • Patent number: 4763159
    Abstract: A movable document handling system, or module, is utilized on a modified standard office copier. When the document handling module is moved away from the platen glass area, the document handling module equipment is disabled and the office copier may be used as a standard copier. When, however, the document handling module is moved over the platen glass, other optics and document handling apparatus are now energized and the standard office copier is now converted into a large document copier. A fold mirror in a first position directs reflected light from the large input document through the standard platen glass for 100% size copying. The fold mirror can be repositioned to reflect the reflected light toward a reduction mirror assembly which then directs the light through the standard platen glass for reduced size copying. The reduction mirror assembly is capable of being repositioned to provide various predetermined amounts of optical reduction.
    Type: Grant
    Filed: July 14, 1983
    Date of Patent: August 9, 1988
    Assignee: Xerox Corporation
    Inventors: Russell A. Temple, Martin G. Wesseler, David C. Harper
  • Patent number: 4755922
    Abstract: This invention relates to a direct current to direct current power converter for use within a transceiver module which connects a user host station, i.e., terminal, printer, workstation, etc., to an Ethernet coaxial cable. The converter provides a adequately regulated DC output voltage, provides high voltage isolation between the Ethernet cable and the operating workstation, and which utilizes fewer parts than known similar power supplies, soft start threshold provisions, overload protection, an LED (light emitting diode) performance indicator, and a trimmer for precise output voltage adjustment.
    Type: Grant
    Filed: March 26, 1987
    Date of Patent: July 5, 1988
    Assignee: Xerox Corporation
    Inventor: John M. Puvogel
  • Patent number: 4751505
    Abstract: An optical mouse 100 wherein light emanating from the light source 106 is reflected off an optical pattern pad and is placed such tha a lens 120 at a predetermined distance from the optical pad focuses the light directly onto an inverted integrated circuit 124 mounted on and through a hole 126 in a printed wiring board 118, the integrated circuit being housed in a clear plastic package. The path from the lens to the integrated circuit package provides an optical guide 122 such that the distances from the pattern pad to the lens, and from the lens to the optical sensor 128 in the integrated circuit, is fixed upon manufacture and assembly without any further optical adjustment. The inverted state of the integrated circuit chip allows a fixed distance to be provided through the hole in the printed wiring board rather than from above it as is common in the prior art.
    Type: Grant
    Filed: June 23, 1986
    Date of Patent: June 14, 1988
    Assignee: Xerox Corporation
    Inventors: Lisa M. Williams, Robert S. Cherry
  • Patent number: 4748480
    Abstract: This invention relates to sensitive or classified documents utilizing specially prepared paper containing a unique substance which will, in the presence of sensors incorporated within a document copier which constantly monitor the field of view for the presence of this unique substance, interrupt the operation of this document copier. Within the copier housing, adjacent the illumination and optical apparatus, a lens gathers some of the reflected light from a document to be copied. This light is then passed through three (3) narrow band spectral filters to three (3) associated detectors. Subsequent circuitry responds to the detected light at the predetermined wavelengths, if present, and, when appropriate, interrupts the operation of the copier and/or sounds an alarm or triggers a camera.
    Type: Grant
    Filed: June 12, 1987
    Date of Patent: May 31, 1988
    Assignee: Xerox Corporation
    Inventors: Paul F. Jacobs, Thomas A. Whatley, John D. Worden, William D. Green, Kenneth I. Gustafson
  • Patent number: 4738901
    Abstract: Method and apparatus are disclosed for the prevention of unauthorized copying of documentation on an office, or other type, copier. Unique phosphors are applied to paper. When such a paper is placed on or in a copier so prepared, the presence of the phosphor is detected and the copier is disabled. Inside the copier a laser emits a beam toward the paper. Two detectors detect, respectively, the laser light reflected from the document and the stimulated light from the phosphor coating or layer. Detection of both signals, in the proper time sequence, will cause the photocopier to cease operation prior to electrostatic or other capture of the image. Upconversion phosphors could be utilized as the phosphor coating due to their scarcity and unliklihood of use in this manner.
    Type: Grant
    Filed: March 27, 1987
    Date of Patent: April 19, 1988
    Assignee: Xerox Corporation
    Inventors: Joel R. Finkel, Paul F. Jacobs, Kenneth I. Gustafson, William D. Green
  • Patent number: 4737448
    Abstract: Method and apparatus for full-color reproduction of a continuous tone color picture or scene using multiple diffraction gratings. The reproduction consists of a plurality of small diffraction gratings (70). A plurality of color separation masks (60) are created for each unique scene. Those picture elements in the original scene containing a given primary color are captured in these transmission-type masks. In certain zones dictated by the separation masks, a plurality of interference patterns are recorded in the properly photosensitized media (70). The spatial freqency of said interference patterns correlates to the primary color to be reproduced. These interference patterns become multiple diffraction gratings when properly developed. The properly photosensitized media may be used as a master for replication purposes. When either master or replica (78) are properly illuminated in white light (76) and properly viewed, the multiple diffraction gratings act to reproduce the colors in the original scene.
    Type: Grant
    Filed: March 31, 1986
    Date of Patent: April 12, 1988
    Assignee: Xerox Corporation
    Inventor: Eric B. Hochberg
  • Patent number: 4733389
    Abstract: A multipoint data communication system is disclosed for transmitting data to and from a plurality of communicating devices via an interconnecting cable. This interconnecting drop cable couples a transceiver unit to a communicating device, such as a personal computer, workstation, printer, or the like. The drop cable herein has only two twisted, jointly shielded, pairs of wires to transmit the three signals (transmit, receive, collision) and power. AC differences in the pairs constitute the third, phantom, signal channel. DC differences in the pairs provide the power source for transceiver operations. This cable is considerably less expensive than the industry standard cable.
    Type: Grant
    Filed: July 28, 1986
    Date of Patent: March 22, 1988
    Assignee: Xerox Corporation
    Inventor: John M. Puvogel
  • Patent number: 4713650
    Abstract: A pipelined digital to analog converter is disclosed which utilizes a series of three capacitor and switch sections to convert a three bit segment of a digital word into an analog voltage. For a ten bit digital word, three 3-capacitor sections would be required with an additional capacitor section. The voltage across the output, or last, capacitor is the analog voltage in direct relation to the input digital word. Each of the three capacitor sections works in relation to switched transistors to charge and discharge in a predetermined fashion said capacitors, in relation to the binary level of each of the three digits in the input digital word. The circuit operates from the least significant bit to the most significant bit, and converts the input digital word to an output analog voltage.
    Type: Grant
    Filed: October 24, 1986
    Date of Patent: December 15, 1987
    Assignee: Xerox Corporation
    Inventors: Gabor C. Temes, Fong J. Wang
  • Patent number: 4712137
    Abstract: A high density charge coupled device imaging array 88 with a bilinear array of photosites on a single integrated circuit chip is utilized in an image scanning configuration. Offset photosites 90a, 94a in the two separated rows are coupled via transfer gates 98, 106 to storage registers 104, 108 and then to two shift registers 110, 112, and via transfer gates 96 directly to two shift registers 100, 102 in a quadrilinear array. The output of these four shift registers 110,102,110,112 are multiplexed to generate a single output pulse train representative of the information scanned. By separating the offset rows 90, 94 of photosites by a row 92 therebetween, the necessity for accurate alignment of the photosite areas is reduced.
    Type: Grant
    Filed: July 20, 1981
    Date of Patent: December 8, 1987
    Assignee: Xerox Corporation
    Inventors: Narayan K. Kadekodi, Abd-El-Fattah A. Ibrahim, Roland J. Handy, Jagdish C. Tandon
  • Patent number: 4686396
    Abstract: A minimum delay, high speed, tri-state bus driver is utilized to couple data and control signals to a memory bus with a minimum amount of buffering. Two transistors 24, 26, utilized in a bootstrap configuration, deliver a system clock to the gate terminals of output transistors 28, 30 which are coupled to the memory bus 40. The input data signals and accompanying control signals are applied to these bootstrap transistors 24, 26 via push/pull amplifiers 20, 22 and, depending on the data level of the input data signal, either a logic 1, a logic 0, or a high impedance open circuit is applied to the bus.
    Type: Grant
    Filed: August 26, 1985
    Date of Patent: August 11, 1987
    Assignee: Xerox Corporation
    Inventors: Simon M. Law, Thien M. Ngo
  • Patent number: 4682842
    Abstract: A rotating, draft angle polygon scanner system for correcting wobble by double reflection of an infinite conjugated light beam from a pair of fixed mirrors having optical power provided by aspheric surfaces. In addition to their wobble correction function, the optical powered mirrors provide the scan and focus functions of conventional f-.theta. scan lens optics and hence such f-.theta. scan lens optics can be eliminated from the scanner system, thereby providing an all mirror scanner system.
    Type: Grant
    Filed: August 31, 1984
    Date of Patent: July 28, 1987
    Assignee: Xerox Corporation
    Inventor: Harry P. Brueggemann
  • Patent number: 4680605
    Abstract: A depletion mode MOS transistor which can function like a constant current source, when its gate is connected to the source and its drain is held at a fixed voltage even above 40 volts. In addition to heavily doped source and drain regions and a lightly doped, gated channel region, all of one conductivity type, formed in a lightly doped substrate or region of the other conductivity type, the transistor includes thin, heavily doped fingers of the other polarity that extend outwardly from beneath the gate to the grounded barrier ring isolating the transistor from other devices in the substrate. The fingers eliminate the flow of parasitic source to drain currents normally existing between the sides of the gate electrode and the barrier, thus providing a depletion mode MOS transistor having an I.sub.SD vs. V.sub.S characteristic more like that of a constant current source when the gate is connected to the source.
    Type: Grant
    Filed: January 13, 1986
    Date of Patent: July 14, 1987
    Assignee: Xerox Corporation
    Inventors: Russel A. Martin, Steven A. Buhler
  • Patent number: 4678322
    Abstract: Method and apparatus are disclosed for the prevention of unauthorized copying of documentation on an office, or other type, copier. Unique phosphors are applied to paper. When such a paper is placed on or in a copier so prepared, the presence of the phosphor is detected and the copier is disabled. Inside the copier a laser emits a beam toward the paper. Two detectors detect, respectively, the laser light reflected from the document and the stimulated light from the phosphor coating or layer. Detection of both signals, in the proper time sequence, will cause the photocopier to cease operation prior to electrostatic or other capture of the image. Upconversion phosphors could be utilized as the phosphor coating due to their scarcity and unliklihood of use in this manner.
    Type: Grant
    Filed: May 30, 1986
    Date of Patent: July 7, 1987
    Assignee: Xerox Corporation
    Inventors: Joel R. Finkel, Paul F. Jacobs, Kenneth I. Gustafson, William D. Green
  • Patent number: 4673811
    Abstract: A variable threshold scan detector for use in raster output scan (ROS) systems, whereby the input scanning beam intensity is continually monitored and the threshold is set at a percentage of the signal value. Feedback from a peak detector circuit adjusts the threshold voltage to approximately 55 percent of the peak voltage. When the signal voltage exceeds the threshold voltage, the crossover circuit is enabled and a scan pulse is generated when crossover is detected. The scan detector ignores noise signals below the threshold voltage.
    Type: Grant
    Filed: December 5, 1985
    Date of Patent: June 16, 1987
    Assignee: Xerox Corporation
    Inventor: Floyd W. Looschen
  • Patent number: 4671839
    Abstract: A process for manufacturing secure identification cards incorporating fiber optic elements which allow the generation of a binary encoded electro-optical signal uniquely identifying that card. Blank card stock will be made from a continuous web system in which the fibers 130 are aligned and brought to an appropriate spacing by combing 134 as they are drawn into the forming machine. The formed web stock is passed through bonding rollers 138 (either thermal or pressure) and then enters a take-up accumulator 150 and then to a punch where the blank forms are punched out of the web. The accumulator stage 150 compensates for the conversion from smooth motion through aligning, mating, and bonding areas to an intermittent motion at the punch area.
    Type: Grant
    Filed: December 23, 1985
    Date of Patent: June 9, 1987
    Assignee: Xerox Corporation
    Inventors: Joel R. Finkel, Paul F. Jacobs
  • Patent number: 4667179
    Abstract: A weighted capacitor digital to analog converter is disclosed which requires only one stage and one conversion step. By the use of two reference voltages and two groups of capacitors in parallel, various capacitors in these groups can be selectively switched from the reference voltages to ground potential in response to input binary digit signals thereby presenting a predetermined amount of voltage to the output amplifier depending upon the number and particular combination of capacitors switched or non-switched to ground.
    Type: Grant
    Filed: March 7, 1985
    Date of Patent: May 19, 1987
    Assignee: Xerox Corporation
    Inventors: Simon M. Law, Thierry L. Watteyne, Dung N. Tran
  • Patent number: D313403
    Type: Grant
    Filed: January 23, 1989
    Date of Patent: January 1, 1991
    Assignee: Apple Computer, Inc.
    Inventors: Hartmut H. Esslinger, Eric I. Gruenberg, James R. Stewart