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| Number | Title | Issue Date |
| 6262811 | Increased functionality for holladay halftoning This is a halftone circuit which, in addition to the usual counting and addressing mechanisms, has control over the phase, angle and direction of the addressing circuitry of the array in memory so that regular dots, mirror images of dots and out-of-phase ... | 07/17/2001 |
| 5473273 | Maximum/minimum hold circuit A circuit which can be used to hold either the maximum or minimum voltage applied. A comparator compares the input voltage to the previous high or low and a set of two mirror circuits either charge or discharge a holding copacitor to the new value. A cont... | 12/05/1995 |
| 5473360 | Adaptive method for high speed detection of position and intensity A look ahead circuit for enabling the calibration of a ROS laser to be calibrated during the active part of the scan. A register takes a number of pixels from the stream of video and compares them to a plurality of possible matching pixel patterns. If a m... | 12/05/1995 |
| 5382967 | Continuously tunable raster resolution printing A circuit for using a flying spot scanner of one scan density to produce rasters of a different density in the process direction by using a fractional number of scans per raster. In the usual case, where m scans will be used to create n rasters, the numbe... | 01/17/1995 |
| 5379321 | High speed PWM without linearity compromise at extreme duty cycles A circuit for reducing the amount of instability in a pulse width modualtion circuit by providing a minimum amount of overdrive after the crossover point between a ramp and a voltage threshold level, and a constant amount of discharge time between the end... | 01/03/1995 |
| 5320927 | Process for manufacturing an improved selenium alloy x-ray imaging member on transparent substrate A method for vacuum depositing a selenium-arsenic coating on a substrate to form a photoreceptor by evaporating selenium with an arsenic concentration of 0.1 to 0.6 percent by weight and discontinuing the evaporation when the weight of the selenium alloy ... | 06/14/1994 |
| 5271070 | Multi-dimensional error diffusion technique A circuit for increasing the speed of conversion of image pixels from one number of bits to another by processing a plurality of pixels in parallel. The conversion of each pixel typically results in a new value and an error term which is divided up among ... | 12/14/1993 |
| 5251058 | Multiple beam exposure control In a raster output scanner, a system for using one original beam and one facet of a rotating polygon to generate a scan line which can be turned on to have three levels of intensity. The original beam is first separated into two beams in a beam splitter. ... | 10/05/1993 |
| 5251057 | Multiple beam optical modulation system In a raster output scanner, a system for using one original beam and one facet of a rotating polygon to generate two consecutive scan lines. The original beam is first separated into two beams in a beam splitter. The resultant beams are polarized ninety d... | 10/05/1993 |
| 5241329 | Multiple resolution ROS A raster output scanner which can be instantly varied between the most common spot densities, such as 240, 300, 400 and 600 spots per inch in the slow scan direction. The scanner produces a plurality of scans per inch, either by scanning with one beam or ... | 08/31/1993 |
| 5229760 | Arithmetic technique for variable resolution printing in a ROS In a raster output scanner, a method of switching video from one raster to the next during a scan without the creation of a visible artifact. A position encoder is used to determine the position of each raster on the photoreceptor, a first distance above ... | 07/20/1993 |
| 5225911 | Means for combining data of different frequencies for a raster output device A circuit for enabling the raster display of text or line art in one constant color against a background of another constant color or against a continuous-tone picture, or the display of a continuous-tone picture through an arbitrary shape. The circuit ha... | 07/06/1993 |
| 5224038 | Token editor architecture A method of representing the text in a document in a way that enables very fast text processing on digital computers. More specifically, each word of text is represented as a number (or token) that refers to an information packet describing the word's cha... | 06/29/1993 |
| 5153739 | Ink catalog for a two color printer A catalog of fonts, each font differing with the others in the bit patterns contained in its characters which when printed yield a different color, all fonts comprising the same number of identical characters, the characters being a predetermined number o... | 10/06/1992 |
| 5134493 | Ink language for a two color printer A programming language optimized for the specification of inks for a printing system using two colorants, black plus a highlight color. The first group of statements name the primary colors such as black and red or magenta. Next specified are the catalog ... | 07/28/1992 |
| 5130565 | Self calibrating PWM utilizing feedback loop for adjusting duty cycles of output signal A circuit for producing an exact duty cycle for a system having a variable system clock frequency. In the calibrate phase, a waveshape with an exact duty cycle is made by ANDing two or more clock pulse trains, each of which is a multiple of the system clo... | 07/14/1992 |
| 5113356 | Colorizing black and white documents A software package is described which resides in a color printing system and which automatically intercepts and colorizes black and white documents (or re-colors color documents, if desired) that are sent to the color printer. The description includes pic... | 05/12/1992 |
| 5111192 | Method to rotate a bitmap image 90 degrees An algorithm for rotating an image 90 degrees starts with an array or r rows and c columns of pixels. Each column of the pixel array is partitioned into words of w pixels each, and the rows, the columns, the words in each column, and the pixels in each wo... | 05/05/1992 |
| 5097256 | Method of generating a cursor A system for using the page buffer memory which stores the pixel map to generate the cursor in a CRT display. An unused portion of the memory is used to store a duplicate copy of the band in which the cursor is currently located, and the cursor is written... | 03/17/1992 |
| 5023661 | Precharging of the X-ray photoreceptor to eliminate the fatigue artifact A process modification for the development of x-ray electrophotographic images with selenium photoreceptors wherein the occurrence of a catastrophic spot producing artifact called fatigue is eliminated. The process change consists of the addition of a pho... | 06/11/1991 |
| 4995105 | Adaptive laser diode driver circuit for laser scanners A circuit used in laser scanners which allows the continuous calibration of a laser so that the output power of the laser is accurately modulated by the input video signal regardless of temperature changes or aging effects of the laser. The video signal i... | 02/19/1991 |
| 4985892 | Baseband local area network using ordinary telephone wiring A Local Area Network (LAN) is disclosed which enables a generalized data communication facility to be established over ordinary telephone wiring. The disclosed technique provides a completely general LAN architecture with any access protocol and is well s... | 01/15/1991 |
| 4961633 | VLSI optimized modulator This invention relates to an electro-optic modulator device, such as a multi-gate light valve for an electro-optic line printer, wherein the different elements are uniquely combined in a package utilizing VLSI principles. A specially designed integrated c... | 10/09/1990 |
| 4924115 | Integrated circuit RC filters with very large time constants This circuit is an input noise filter. An RC circuit comprises a capacitor implemented from a transistor with source and drain tied together and a long transistor acting as a resistance which can either be large or small, depending on the bias. The output... | 05/08/1990 |
| 4898437 | Wobble correction by two reflections on a facet without bow A polygon system for correcting wobble by double reflection from the active facet without bow is disclosed. Instead of the impinging light source being transverse to the axis of rotation of a rotating polygon, this rotating polygon 12 having facets at a d... | 02/06/1990 |
| 4899180 | On chip heater element and temperature sensor This bubblejet device has integrated into it a number of heater resistors and a temperature sensor which operate in conjunction with a temperature regulating circuit to heat the chip to its optimum operating temperature within seconds of turn-on, and ther... | 02/06/1990 |
| 4870273 | Jitter reduction in rotating polygon scanning systems This invention relates to a pyramid polygon scanner without cylinder optics wherein the effects of jitter are reduced by the use of a start of scan detector situated at a predetermined angle from the normal (vertical) position. The start of scan detector ... | 09/26/1989 |
| 4860237 | Scan linearity correction A method for generating a variable frequency clock pulse for a raster scanner. First, a correction number, which may be the sum of corrections for scan-nonlinearity, polygon signature errors and motor hunt errors, is generated. This number is then added p... | 08/22/1989 |
| 4858045 | Magnetic disk lock having braking apparatus A magnetic disc drive brake assembly which automatically locks the disc drive when it is removed from its case. As the disc drive is lifted, a spring is released, which spring forces a brake pad into contact with the disc drive hub, thus locking the disc ... | 08/15/1989 |
| 4853718 | On chip conductive fluid sensing circuit The ink in an ink jet is sensed by a capacitor, one plate of which is coupled to ground through the ink. The absence of ink will appear as a decreased amount of capacitance. In this case the charge of the capacitor will leak off faster, and a sample and h... | 08/01/1989 |
| 4829452 | Small angle image rotation using block transfers A simplified method for rotating a digital image through a small angle without the need for interpolation is described. The image is divided into small, square blocks, arranged in horizontal rows where each block is exactly to the left or right of the oth... | 05/09/1989 |
| 4815009 | Algorithm for filling an image outline A method of converting an outine defined by a plurality of vectors into an optimum set of trapezoids which can be filled in using standard printer techniques. The process is to determine all points in the outline where two vectors intersect, and the locat... | 03/21/1989 |
| 4814552 | Ultrasound position input device This invention is an input device, or stylus, for entering hand drawn forms into a computer comprising a writing instrument, a pressure switch for determining whether the instrument is in contact with the writing surface, an acoustic transmitter for trian... | 03/21/1989 |
| 4801971 | Liquid control assembly In a liquid toner xerographic system, a sheet of matted polyester is held against the back of the selenium xerographic plate as it passes the transfer station to absorb the toner on the back and leading and trailing edges of the plate. The material is sup... | 01/31/1989 |
| 4786045 | Offsetting and registration paper transport A registration mechanism for offsetting paper sets against a registration edge which is alternately in an inboard and an outboard position. The paper sheet is urged against the registration edge by means of two rotating urathane paddle wheels positioned r... | 11/22/1988 |
| 4763190 | Digital color correction circuit This color copying system scans the original with a raster input scanner to generate digital signals representing red, green and blue, and prints at a raster output scanner which uses cyan, magenta, yellow and black ink. In addition, under color removal i... | 08/09/1988 |
| 4762065 | Sheet infeed mechanism for a printing machine This invention is an infeed mechanism for a sheet fed printing machine comprising a chute for guiding a sheet from a staging position into an array of moving grippers. To improve the reliability and accuracy of placement of the sheet leading edge into the... | 08/09/1988 |
| 4751523 | Laser scanner power compensation circuit A circuit for correcting the write power of a laser raster output scanner as it scans across the write drum. During calibration, a piece of glass reflects part of the beam into a photo multiplier tube, the output of which is converted into a digital signa... | 06/14/1988 |
| 4733108 | On-chip bias generator An improved on-chip bias generator for producing a negative bias for the substrate of a VLSI FET chip for reducing the body effect and for increasing circuit speed. The improvement comprises active FETs to rectify a ring oscillator square wave output, the... | 03/22/1988 |
| 4706077 | Halftoning implementation for interactive image editing A circuit for producing a "knight ordered dither" halftone pattern for a CRT and a "double spiral" halftone pattern for a xerographic printer is described. The circuit comprises a RAM for storing the threshold values, a comparator, and supporting addressi... | 11/10/1987 |
