Patents Represented by Attorney Frederick H. Gribbell
  • Patent number: 6948446
    Abstract: A highly reflective arrowhead traffic sign is provided which exhibits an arrow shape to “aim” traffic to one side or the other along a roadway. A horizontal longitudinal member has at least one pair of arrow-shaped “wings” that extend beyond the outer boundary of the horizontal member. The wing sets can be attached to the horizontal member by use of locating holes and mating pins, or they can be pivotally mounted on the horizontal member. The arrow wings can be shaped into a configuration that points to the left or to the right, or they can be placed on both ends of the horizontal member and simultaneously point to both the left and right, thereby indicating to traffic that a lane is closed, and that traffic must go either left or right to avoid the closed lane.
    Type: Grant
    Filed: June 18, 2003
    Date of Patent: September 27, 2005
    Assignee: RTS, LLC
    Inventor: Kenneth J. Greves
  • Patent number: 6914700
    Abstract: A method for reducing or eliminating residual error when “blank” pixels are found in the input image data is provided, such as one that can be used in printers of the type which use error diffusion as part of the halftoning process. When a blank pixel is found, the residual error may be immediately reduced in magnitude in one embodiment. In another embodiment, a “hop count” value is increased (or incremented) when a blank pixel is found, and if sufficient consecutive blank pixels exist in the input data, the hop count achieves a threshold and then either decimates or eliminates the residual error, thus limiting the migration of residual error. If a non-blank pixel is found in the input data before the threshold is achieved, the hop count is reset to zero.
    Type: Grant
    Filed: April 17, 2003
    Date of Patent: July 5, 2005
    Assignee: Lexmark International, Inc.
    Inventor: Khageshwar Thakur
  • Patent number: 6875966
    Abstract: A portable induction tool is provided for soldering or brazing sections of metal pipe together. A work coil head (with induction coil) is U-shaped, allowing placement of the head around lengths of pipe, heating a susceptor (e.g., the pipe) to form a joint, and then to be withdrawn after the pipe joint is made. In one form, the tool uses heat pipes to remove thermal energy from the head, and also a heat exchanger for higher-powered units. Power capacitors are generally included with the induction (work) coil to create a tank circuit of a resonant frequency. The induction coil uses Litz wire, copper tubing, or heat pipes with a conductive outer skin to carry the high-current being delivered to the induction coil. The induction coil has a general racetrack configuration, which is typically wound in a U-shape (or as a semicircle) as a single winding, with multiple turns.
    Type: Grant
    Filed: March 15, 2004
    Date of Patent: April 5, 2005
    Assignee: Nexicor LLC
    Inventors: John P. Barber, Robert C. Cravens, II, Antonios Challita, Susan A. Stanton
  • Patent number: 6849837
    Abstract: A method for using magnetic fields to heat magnetically susceptible materials within and/or adjacent to adhesives, so as to bond, bind, or fasten solid materials to one another. The system uses alternating magnetic fields that induce eddy currents and generate heat within susceptors. An induction heating tool is used to emit the magnetic field at its work coil, and an electronic controller measures the energy being used by a power converter that generates the alternating current driving the work coil which creates the magnetic field. The heating tool is used in a method of adhesive bonding in which the thickness of the conductive layer of the susceptor is in the range of 0.01-3.0 mils, or the heating event time interval is in the range of 0.05-10.0 seconds, or the average power density of the magnetic field at the susceptor is in the range of 10-5000 Watts per square inch.
    Type: Grant
    Filed: September 12, 2003
    Date of Patent: February 1, 2005
    Assignee: Nexicor LLC
    Inventors: Edward A. Riess, Adam G. Malofsky, John P. Barber, David P. Bauer
  • Patent number: 6810229
    Abstract: An improved fuser subassembly is provided for electrophotographic printers, in which the detack fingers that separate print media from the fuser hot roll do not make physical contact with that hot roll, and thus are “non-contact” detack fingers. A maximum clearance distance is observed as a relatively tight tolerance between the surface of the hot roll and the tip of the non-contact detack fingers. Both color and mono laser printer products can benefit from this design. Since the finger tips are spaced-apart from the fuser hot roll, the life of the hot roll is increased, and other potential problems are eliminated, such as contamination of the detack fingers, which sometimes cause accordion jams of prior art “contact” detack fingers.
    Type: Grant
    Filed: December 30, 2002
    Date of Patent: October 26, 2004
    Assignee: Lexmark International, Inc.
    Inventors: Larry Christopher Coleman, Samuel Winton Holmes, Jr.
  • Patent number: 6764162
    Abstract: An improved shingle mask is provided for use on ink jet printers which use multi-pass printing (shingling) to form bitmap images. The shingle mask is derived from a shingle mask density distribution which exhibits a substantially trapezoidal shape; the shingle mask density distribution is derived from an accumulated shingle mask distribution (also referred to as a “banding profile”) having an overall shape of a plateau portion and a substantially smooth decreasing portion, which reduces the number of drops to be printed along the outermost edges of the mask on each swath. This shape reduces banding effects by effectively increasing a number of printed-density bands which are decreased in size, while at the same time not increasing the number of printhead passes over a given area on the print media (which otherwise would negatively impact printed throughput).
    Type: Grant
    Filed: April 30, 2002
    Date of Patent: July 20, 2004
    Assignee: Lexmark International, Inc.
    Inventors: Mary Ellen Biddle, Brian Edward Cooper, Chengwu Cui, Buford Rodney Goble, Ross William McFarland, Steven Frank Weed, Bryan Scott Willett
  • Patent number: 6747537
    Abstract: A set of holding magnets is provided that exhibit shaped edges or surfaces that provide some extra mechanical strength to aid in improving upon the shear force resistance capabilities while in a holding relationship. In one embodiment, the longitudinal edge of one magnet is notched (or grooved) while its mating magnet exhibits a protrusion along one of its longitudinal edges. When the magnets are brought together so that the protrusion is inserted at least part-way into the notch, the two magnets will hold together using both magnetic and mechanical properties to advantage. The holding relationship will exhibit an increased shear force resistance that otherwise would entirely depend upon the magnetic strength to prevent a shear force from pulling the two magnets apart. In a second embodiment, the planar top surface of one rectangular strip magnet is notched (or grooved) while its mating magnet exhibits a protrusion along one of its rectangular surfaces.
    Type: Grant
    Filed: May 29, 2002
    Date of Patent: June 8, 2004
    Assignee: Magnet Technology, Inc.
    Inventor: Larry A. Mosteller
  • Patent number: 6718852
    Abstract: A garbage disposal plunger is provided that is designed to push refuse into a standard kitchen sink garbage disposal unit. The plunger apparatus includes four major sections: a knob portion, handle portion, stopper portion, and plunger portion. The knob portion is used to prevent the human hand of the user from slipping while gripping the device; the handle portion acts as a shank between the gripable knob and the plunger and, in conjunction with the knob portion, is designed to aid the human user of the device for maximum gripping capabilities and comfort. The stopper portion manifests a larger diameter which prevents the plunger portion of the device from contacting the blades of the garbage disposal, and prevents the human hand of the user from entering the garbage disposal. The plunger apparatus contains a liquid which can be dispensed through a spout which has a lid.
    Type: Grant
    Filed: October 29, 2001
    Date of Patent: April 13, 2004
    Inventors: Harry Mordt Bickel, Eugene L. Timperman
  • Patent number: 6710314
    Abstract: An apparatus and system for using magnetic fields to heat magnetically susceptible materials within and/or adjacent to adhesives, resins, or composites so as to reversibly or irreversibly bond, bind, or fasten opaque or non-opaque solid materials to one another. The system makes use of the effect that alternating magnetic fields induce eddy currents and generate heat within susceptors, and the effect that alternating magnetic fields additionally induce magnetic hysteresis that occurs in magnetic materials and thereby generate heat. An induction heating tool is used to emit the magnetic field at its work coil, and an electronic controller measures the energy being used by a power converter that generates the alternating current driving the work coil which creates the magnetic field. The distance between the susceptor and work coil is repeatedly analyzed based upon the power converter's input energy, and the work coil is driven at a repeatedly corrected power level during the heating cycle.
    Type: Grant
    Filed: November 22, 2002
    Date of Patent: March 23, 2004
    Assignee: Nexicor LLC
    Inventors: Edward A. Reiss, Adam G. Malofsky, John P. Barber, Gary L. Claypoole, Robert Carl Cravens, II, David R. Pacholok, Charles A. Kuecker
  • Patent number: 6681094
    Abstract: A single-pass color electrophotographic printer includes four imaging stations, yellow, cyan, magenta, and black, on a generally linear path. A toned image in each toner color is developed on an image bearing member or photoconductive drum. A plurality of electrically biased first transfer rollers associated with each imaging station is operative to transfer the developed images from the photoconductive drum to an intermediate transfer member (ITM) belt that travels sequentially past the imaging stations along the generally linear path in a first transfer operation. The image on the ITM belt is transferred to media at a second transfer operation at which the ITM belt passes through a nip between a backup roller and a further electrically biased transfer roller. A servo operation is used to set the voltages on the transfer rollers. Rollers at the second transfer are positioned to direct media downwardly out of the nip to a media transport belt and to a fuser assembly.
    Type: Grant
    Filed: October 4, 2001
    Date of Patent: January 20, 2004
    Assignee: Lexmark International, Inc.
    Inventors: Paul Douglas Horrall, Kurt Matthew Korfhage, Matthew Lowell McKay, Mark Andrew Omelchenko, Gregory Lawrence Ream
  • Patent number: 6661981
    Abstract: Transfer belt subassembly for a color printer includes a transfer belt, home position indicator, temperature sensor, and memory. The transfer belt subassembly is measured and characterized after fabrication, before being installed in a printer. Measurement and calibration data for the transfer belt is stored in memory as part of the subassembly, including data representing velocity characteristics of the transfer belt and temperature compensation factors used by an engine-controller in a method to govern the speed of the drive motor. When the transfer belt subassembly is inserted into a printer, the engine-controller is operative in response to data stored in the memory and sensed belt velocity and temperature data, providing adjustment of belt velocity and compensation for variations in the transfer belt speed. Using the predetermined characterizing data, precise alignment of the color planes with respect to one another is achieved for accurate color printing.
    Type: Grant
    Filed: October 15, 2001
    Date of Patent: December 9, 2003
    Assignee: Lexmark International, Inc.
    Inventors: Richard M. Boothe, Danny K. Chapman, Mark A. Omelchenko, Gregory L. Ream, John P. Richey
  • Patent number: 6658043
    Abstract: A multiple output spread spectrum clock circuit is provided that reduces electromagnetic emissions when two different clocks operate at frequencies which overlap one another. Two such clock circuits are controlled so as to introduce a phase difference between the clocks as they operate through their spread spectrum profiles. The “best” phase differences are around 18%, or around 50%, between adjacent spread spectrum clock outputs. The phase difference can be controlled by starting the first clock (SSCG #1) at one point in time, while temporarily delaying the start of the second clock (SSCG #2) until the appropriate moment; alternatively, it can be controlled by starting both clocks at the same moment in time, however, SSCG #1 begins at one point in the spread spectrum profile, while SSCG #2 begins at a different point in its spread spectrum profile.
    Type: Grant
    Filed: October 26, 2001
    Date of Patent: December 2, 2003
    Assignee: Lexmark International, Inc.
    Inventors: Keith Bryan Hardin, Robert Aaron Oglesbee, Brian Keith Owens
  • Patent number: 6650352
    Abstract: The write lines of a color laser printer are maintained substantially equal throughout the printer's operation by an electronic control arrangement. At the factory, the write lines on all photoconductors of the color laser printer are calibrated to be substantially equal, and the ratio of each write line to a measuring line for each photoconductor is ascertained. During operation of the printer, the length of each of the measuring lines is periodically determined through counting the number of PELslice clock timing pulses produced from a PELslice clock operating at a fixed frequency determined during factory calibration. The length of the write line is determined by the product of the length of the measuring line and the factory calibrated ratio of the length of the write line to the length of the measuring line.
    Type: Grant
    Filed: November 13, 2001
    Date of Patent: November 18, 2003
    Assignee: Lexmark International, Inc.
    Inventors: Daniel Eugene Pawley, David Anthony Schneider, Thomas Campbell Wade, Earl Dawson Ward, II
  • Patent number: 6647437
    Abstract: A printer is provided which has a special Emulation Manager function as well as a “code sniffer” function, in which print data received is sent to a code sniffer buffer. A code sniffer function automatically determines the type of emulator that should be called to perform the interpretation or rendering of this print job, and if the code sniffer determines that the correct emulator is PostScript, then the code sniffer scans the data for any “special tokens.” If a special token is found, the PostScript emulator determines if the special token string data is part of a PostScript comment. If it is in the correct format, then the PostScript emulator sets the “mode flag” to the “MacBinary” state, and the code sniffer ceases any further filtering of control characters and disables any change of emulator command that may be received during this print job.
    Type: Grant
    Filed: May 15, 2001
    Date of Patent: November 11, 2003
    Assignee: Lexmark International, Inc.
    Inventors: Erik Nils Ackerman, Robert Jerome Borchers, Howard Charles Cochran, Steven Lane Duncan, David Keith Lane
  • Patent number: 6643728
    Abstract: An improved signal converter is provided to interface between an IEEE 1284 (parallel) bus or device and an IEEE 1394 (serial) bus or device. The converter in its preferred embodiment is designed for use with printers, in which the printer communicates with the converter through either the converter's 1284 port or its 1394 port. In one system, the converter acts as a “1284-to-1394 converter” to interface between a printer (on the 1394 port) and a host computer (on the 1284 port). In a second system, the converter acts as a “peer-to-peer 1394-to-1284 converter” to interface between a printer (on the 1284 port) and some type of 1394 compliant device (on the 1394 port), such as a digital camera. The converter includes a Link layer that is embedded within an ASIC, which preferably includes a microcontroller or a logic state machine, to facilitate asynchronous data transfer.
    Type: Grant
    Filed: May 30, 2000
    Date of Patent: November 4, 2003
    Assignee: Lexmark International, Inc.
    Inventors: David Allen Crutchfield, Stephen Kelly Cunnagin, Timothy John Rademacher
  • Patent number: 6639197
    Abstract: An apparatus and system for using magnetic fields to heat magnetically susceptible materials within and/or adjacent to adhesives, resins, or composites so as to reversibly or irreversibly bond, bind, or fasten opaque or non-opaque solid materials to one another. The system makes use of the effect that alternating magnetic fields induce eddy currents and generate heat within susceptors, and the effect that alternating magnetic fields additionally induce magnetic hysteresis that occurs in magnetic materials and thereby generate heat. An induction heating tool is used to emit the magnetic field at its work coil, and an electronic controller measures the energy being used by a power converter that generates the alternating current driving the work coil which creates the magnetic field. The distance between the susceptor and work coil is repeatedly analyzed based upon the power converter's input energy, and the work coil is driven at a repeatedly corrected power level during the heating cycle.
    Type: Grant
    Filed: November 22, 2002
    Date of Patent: October 28, 2003
    Assignee: Nexicor LLC
    Inventors: Edward A. Riess, Adam G. Malofsky, John P. Barber, David P. Bauer
  • Patent number: 6639198
    Abstract: An apparatus and system for using magnetic fields to heat magnetically susceptible materials within and/or adjacent to adhesives, resins, or composites so as to reversibly or irreversibly bond, bind, or fasten opaque or non-opaque solid materials to one another. The system makes use of the effect that alternating magnetic fields induce eddy currents and generate heat within susceptors, and the effect that alternating magnetic fields additionally induce magnetic hysteresis that occurs in magnetic materials and thereby generate heat. An induction heating tool is used to emit the magnetic field at its work coil, and an electronic controller measures the energy being used by a power converter that generates the alternating current driving the work coil which creates the magnetic field. The distance between the susceptor and work coil is repeatedly analyzed based upon the power converter's input energy, and the work coil is driven at a repeatedly corrected power level during the heating cycle.
    Type: Grant
    Filed: November 22, 2002
    Date of Patent: October 28, 2003
    Assignee: Nexicor LLC
    Inventors: Edward A. Riess, Adam G. Malofsky, John P. Barber, Gary L. Claypoole, Robert Carl Cravens, II
  • Patent number: 6624911
    Abstract: A printer that stores a minimal number of unadjusted stochastic threshold arrays in non-volatile memory, in which the unadjusted threshold arrays are used to generate adjusted threshold arrays at run time by use of Transfer Function Tables (TFT's). The unadjusted array for a particular color is stored in the printer's ROM and preferably is stored in a packed configuration to save memory space. The TFT's are used to convert the unadjusted threshold data into adjusted threshold data for each color and type of print media. In a preferred embodiment, the unadjusted threshold array comprises a 128 row by 128 column sized array, and each element of this array comprises a 10-bit number. When the TFT is applied to this unadjusted array, the resulting numeric values for the adjusted array elements are produced as 8-bit numeric values. The greater precision in the originating unadjusted array provides more perceptual levels of intensity (i.e.
    Type: Grant
    Filed: November 17, 1999
    Date of Patent: September 23, 2003
    Assignee: Lexmark International, Inc.
    Inventors: Brian Edward Cooper, Brian Wesley Damon, Shaun Timothy Love
  • Patent number: 6619786
    Abstract: An improved TAB circuit is provided for use with ink jet printer cartridges, which carries electrical signals to an array of nozzles on a heater chip. The TAB circuit eliminates bent or broken electrical circuit traces before being bonded to the heater chip by creating a chip window that partially overlaps the edges of the heater chip, and by bringing the electrical circuit traces to the chip window and terminating these circuit traces at a PI (polyimide) edge, which defines the inner perimeter of the chip window. The circuit traces thus are not unsupported at their ends before being assembled to the heater chip, and are automatically correctly positioned to make contact with bond pads of the heater chip when the overall TAB circuit is in correct registration therewith. The TAB circuit also provides an improved tolerance for a covercoat placement that will tend to prevent corrosive ink from coming into contact with these metal traces.
    Type: Grant
    Filed: June 8, 2001
    Date of Patent: September 16, 2003
    Assignee: Lexmark International, Inc.
    Inventors: Brian Lee Cobb, Jeffrey Louis Sangalli
  • Patent number: D495234
    Type: Grant
    Filed: August 22, 2003
    Date of Patent: August 31, 2004
    Assignee: SentriLock, Inc.
    Inventors: Scott R. Fisher, William J. Kraimer