Patents by Inventor Thomas F Uhling

Thomas F Uhling has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6412901
    Abstract: A monitoring system monitors a pressure wave developed in the surrounding ambient environment during inkjet droplet formation. The monitoring system uses either acoustic, ultrasonic, or other pressure wave monitoring mechanisms, such as a laser vibrometer, an ultrasonic transducer, or an accelerometer sensor, for instance, a microphone to detect droplet formation. One sensor is incorporated in the printhead itself, while others may be located externally. The monitoring system generates information used to determine current levels of printhead performance, to which the printer may respond by adjusting print modes, servicing the printhead, adjusting droplet formation, or by providing an early warning before an inkjet cartridge is completely empty. During printhead manufacturing, an array of such sensors may be used in quality assurance to determine printhead performance. An inkjet printing mechanism is also equipped for using this monitoring system, and a monitoring method is also provided.
    Type: Grant
    Filed: April 24, 2001
    Date of Patent: July 2, 2002
    Assignee: Hewlett-Packard Company
    Inventors: Wen-Li Su, Trudy L. Benjamin, Steven B. Elgee, Thomas F. Uhling, Bruce A. Axten, Kerry J. Lundsten, Xiuting C. Man, Tamara L. Hahn, Michael T. Dangelo, Bryan D. Woll, Timothy L. Weber, James W Pearson, Iue-Shuenn Chen
  • Publication number: 20010028371
    Abstract: A monitoring system monitors a pressure wave developed in the surrounding ambient environment during inkjet droplet formation. The monitoring system uses either acoustic, ultrasonic, or other pressure wave monitoring mechanisms, such as a laser vibrometer, an ultrasonic transducer, or an accelerometer sensor, for instance, a microphone to detect droplet formation. One sensor is incorporated in the printhead itself, while others may be located externally. The monitoring system generates information used to determine current levels of printhead performance, to which the printer may respond by adjusting print modes, servicing the printhead, adjusting droplet formation, or by providing an early warning before an inkjet cartridge is completely empty. During printhead manufacturing, an array of such sensors may be used in quality assurance to determine printhead performance. An inkjet printing mechanism is also equipped for using this monitoring system, and a monitoring method is also provided.
    Type: Application
    Filed: April 24, 2001
    Publication date: October 11, 2001
    Inventors: Wen-LI Su, Trudy L. Benjamin, Steven B. Elgee, Thomas F. Uhling, Bruce A. Axten, Kerry J. Lundsten, Xiuting C. Man, Tamara L. Hahn, Michael T. Dangelo, Bryan D. Woll, Timothy L. Weber, James W. Pearson, Iue-Shuenn Chen
  • Patent number: 6260941
    Abstract: A monitoring system monitors a pressure wave developed in the surrounding ambient environment during inkjet droplet formation. The monitoring system uses either acoustic, ultrasonic, or other pressure wave monitoring mechanisms, such as a laser vibrometer, an ultrasonic transducer, or an accelerometer sensor, for instance, a microphone to detect droplet formation. One sensor is incorporated in the printhead itself, while others may be located externally. The monitoring system generates information used to determine current levels of printhead performance, to which the printer may respond by adjusting print modes, servicing the printhead, adjusting droplet formation, or by providing an early warning before an inkjet cartridge is completely empty. During printhead manufacturing, an array of such sensors may be used in quality assurance to determine printhead performance. An inkjet printing mechanism is also equipped for using this monitoring system, and a monitoring method is also provided.
    Type: Grant
    Filed: April 9, 1999
    Date of Patent: July 17, 2001
    Assignee: Hewlett-Packard Company
    Inventors: Wen-Li Su, Trudy L. Benjamin, Steven B. Elgee, Thomas F. Uhling, Bruce A. Axten, Kerry J. Lundsten, Xiuting C. Man, Tamara L. Hahn, Michael T. Dangelo, Bryan D. Woll, Timothy L. Weber, James W Pearson, Iue-Shuenn Chen
  • Patent number: 6199765
    Abstract: A bi-directionally scannable bar code pattern having a parallel array of alternating lines and spaces, each having selected widths. Each line has a common series of segments and segment spaces of selected lengths. The length of each segment may be the same as the width of a corresponding line, and the length of each segment space may be the same as the width of a corresponding space between lines. The pattern may be printed on a sheet of printer media, or on a strip attached to such a sheet.
    Type: Grant
    Filed: November 23, 1999
    Date of Patent: March 13, 2001
    Assignee: Hewlett-Packard Company
    Inventor: Thomas F Uhling
  • Patent number: 6028320
    Abstract: A detector for use in detecting at least one mark on a sheet of print media used in a printing device, the mark indicating at least one characteristic of the sheet of print media, is disclosed. The detector includes a source, a sensor, and a bandstop filter. The source generates a first light signal that is directed at the mark on the sheet of print media, the first light signal having a first predetermined wavelength. The sensor is configured to detect a second light signal from the mark on the sheet of print media, the second light signal arising in response to the first light signal and having a second predetermined wavelength. The bandstop filter is positioned between the sensor and the mark on the sheet of print media and is configured to block from the sensor the first predetermined wavelength of the first light signal generated by the source and transmit to the sensor other wavelengths of light, including the second predetermined wavelength of the second light signal.
    Type: Grant
    Filed: January 20, 1998
    Date of Patent: February 22, 2000
    Assignee: Hewlett-Packard Company
    Inventor: Thomas F Uhling
  • Patent number: 5984193
    Abstract: A bi-directionally scannable bar code pattern having a parallel array of alternating lines and spaces, each having selected widths. Each line has a common series of segments and segment spaces of selected lengths. The length of each segment may be the same as the width of a corresponding line, and the length of each segment space may be the same as the width of a corresponding space between lines. The pattern may be printed on a sheet of printer media, or on a strip attached to such a sheet.
    Type: Grant
    Filed: March 4, 1998
    Date of Patent: November 16, 1999
    Assignee: Hewlett-Parkard Company
    Inventor: Thomas F Uhling
  • Patent number: 5940965
    Abstract: A probe head includes analog amplifier inputs, a ground plane, and hundreds of probe leads between the inputs and the pins of a circuit under test. The customer defines the grounded pins of the circuit under test. Non-active probe leads, i.e. leads corresponding to the grounded pins are connected to the ground plane, maximizing the connections between the grounds of the probe and the circuit under test and minimizing unequal ground potentials. The probe circuit is on a probe circuit board, while the connections between the ground plane and the leads are fusible elements on a separate ground personality board. The probe is placed on a simulated circuit under test, the grounded pins on the circuit under test are protected by an insulating cap, and a voltage is placed on the remainder of the pins to fuse the elements corresponding the active probe leads.
    Type: Grant
    Filed: April 30, 1997
    Date of Patent: August 24, 1999
    Assignee: Hewlett-Packard Company
    Inventors: Thomas F. Uhling, David J. Dascher, Keith C. Griggs
  • Patent number: 5929875
    Abstract: A monitoring system monitors a pressure wave developed in the surrounding ambient environment during inkjet droplet formation. The monitoring system uses either acoustic, ultrasonic, or other pressure wave monitoring mechanisms, such as a laser vibrometer, an ultrasonic transducer, or an accelerometer sensor, for instance, a microphone to detect droplet formation. One sensor is incorporated in the printhead itself, while others may be located externally. The monitoring system generates information used to determine current levels of printhead performance, to which the printer may respond by adjusting print modes, servicing the printhead, adjusting droplet formation, or by providing an early warning before an inkjet cartridge is completely empty. During printhead manufacturing, an array of such sensors may be used in quality assurance to determine printhead performance. An inkjet printing mechanism is also equipped for using this monitoring system and a monitoring method is also provided.
    Type: Grant
    Filed: July 24, 1996
    Date of Patent: July 27, 1999
    Assignee: Hewlett-Packard Company
    Inventors: Wen-Li Su, Trudy L. Benjamin, Steven B. Elgee, Thomas F. Uhling, Bruce A. Axten, Kerry J. Lundsten, Xiuting C. Man, Tamara L. Hahn, Michael T. Dangelo, Bryan D. Woll, Timothy L. Weber, James W Pearson, Iue-Shuenn Chen
  • Patent number: 5898312
    Abstract: A probe head includes analog amplifier inputs, a ground plane, and hundreds of probe leads between the inputs and the pins of a circuit under test. The customer defines the grounded pins of the circuit under test. Non-active probe leads, i.e. leads corresponding to the grounded pins are connected to the ground plane, maximizing the connections between the grounds of the probe and the circuit under test and minimizing unequal ground potentials. The probe circuit is on a probe circuit board, while the connections between the ground plane and the leads are fusible elements on a separate ground personality board. The probe is placed on a simulated circuit under test, the grounded pins on the circuit under test are protected by an insulating cap, and a voltage is placed on the remainder of the pins to fuse the elements corresponding the active probe leads.
    Type: Grant
    Filed: April 30, 1997
    Date of Patent: April 27, 1999
    Assignee: Hewlett-Packard Company
    Inventors: Thomas F. Uhling, David J. Dascher, Keith C. Griggs
  • Patent number: 5654647
    Abstract: A probe head includes analog amplifier inputs, a ground plane, and hundreds of probe leads between the inputs and the pins of a circuit under test. The customer defines the grounded pins of the circuit under test. Non-active probe leads, i.e. leads corresponding to the grounded pins are connected to the ground plane, maximizing the connections between the grounds of the probe and the circuit under test and minimizing unequal ground potentials. The probe circuit is on a probe circuit board, while the connections between the ground plane and the leads are fusible elements on a separate ground personality board. The probe is placed on a simulated circuit under test, the grounded pins on the circuit under test are protected by an insulating cap, and a voltage is placed on the remainder of the pins to fuse the elements corresponding the active probe leads.
    Type: Grant
    Filed: August 23, 1995
    Date of Patent: August 5, 1997
    Assignee: Hewlett-Packard Company
    Inventors: Thomas F. Uhling, David J. Dascher, Keith C. Griggs
  • Patent number: 5654669
    Abstract: A first amplifier channel between an input and output includes an input transistor emitter and a first output transistor emitter connected together to form a first emitter pair. A current source is connected to the emitter pair via a transistor which is controlled by a latch. Programming the latch permits the channel to be turned on or off. The emitter pair is connected to a positive voltage through a resistor and to ground through a diode to force it to a controlled off voltage, which prevents signals from passing when the channel is off. There is a output driver amplifier in a feedback circuit. An outdisable circuit controls the voltage and current of the output driver amplifier to place the output in a state in which it appears electrically as an open circuit when the channel is off. Multiple programmable amplifiers can be combined to make a multiplexer, a selectable gain circuit, or a selectable attenuation circuit, all with high band width and high signal integrity.
    Type: Grant
    Filed: May 2, 1996
    Date of Patent: August 5, 1997
    Assignee: Hewlett-Packard Company
    Inventors: Thomas F. Uhling, Keith C. Griggs
  • Patent number: 5629617
    Abstract: An analog electronic test probe includes hundreds of inputs each connected to two amplifiers, each in a separate multiplexer stage on an integrated circuit. A programmer, responsive to a dial, shifts data through a shift register of latches each of which is connected to one of the amplifiers, activating the amplifier(s) connected to the selected input, thereby multiplexing it (them) to selected output(s). Similarly, the gain for each output may be selected. An outdisable circuit connected to the outputs of each multiplexer and the outputs of each IC chip causes each output to appear electrically as an open circuit when no input associated with the multiplexer or chip is selected. This permits any number of multiplexers and IC chips to be daisy-chained together.
    Type: Grant
    Filed: January 6, 1995
    Date of Patent: May 13, 1997
    Assignee: Hewlett-Packard Company
    Inventors: Thomas F. Uhling, David J. Dascher, Kenneth Rush, Keith C. Griggs
  • Patent number: 5625299
    Abstract: A probe head includes integrated circuit chip inputs, a ground plane on a circuit board, and hundreds of probe leads comprising traces on the circuit board connected between the inputs and a circuit under test. Each trace is about 3 mils wide. There is a DICLAD polytetrafluoroethylene dielectric material of dielectric constant of about 2.2 between the ground and traces. Every other trace is electrically connected to the ground plane. Input resistors are buried in the circuit board and there is an on-chip input divider network. The customer defines the grounded pins of a circuit to be tested. Probe leads corresponding to the grounded pins are connected to the ground plane, maximizing the connections between the grounds of the probe and the circuit under test and minimizing unequal ground potentials.
    Type: Grant
    Filed: February 3, 1995
    Date of Patent: April 29, 1997
    Inventors: Thomas F. Uhling, David J. Dascher, Keith C. Griggs
  • Patent number: 5602483
    Abstract: An electronic probe circuit having ac and dc amplifiers and an input compensation subcircuit is enclosed within a trim housing that replicates the electrical effect of the probe housing. The circuit is laser trimmed through ports in the trim housing. The difference between the voltage at 80 nsec and 1.4 .mu.sec points on a step voltage provides a first calibration factor while the difference between the 3 nsec voltage and the 80 nsec voltage provides a second calibration factor. A resistor in the DC amplifier is trimmed to an absolute voltage with a step scan laser cut. A resistor in the AC amplifier is trimmed with a laser L-cut until the difference between the 80 nsec and 1.4 .mu.sec points of the step voltage equals the first calibration factor. A capacitor in the input compensation subcircuit is trimmed until the voltage difference between the 3 nsec and 80 nsec points equals the second calibration factor.
    Type: Grant
    Filed: February 27, 1995
    Date of Patent: February 11, 1997
    Assignee: Hewlett-Packard Company
    Inventors: Thomas F. Uhling, Philip J. Yearsley, Dale L. Pittock, Mark E. Mathews
  • Patent number: 5600278
    Abstract: A first amplifier channel between an input and output includes an input transistor emitter and a first output transistor emitter connected together to form a first emitter pair. A current source is connected to the emitter pair via a transistor which is controlled by a latch. Programming the latch permits the channel to be turned on or off. The emitter pair is connected to a positive voltage through a resistor and to ground through a diode to force it to a controlled off voltage, which prevents signals from passing when the channel is off. There is a output driver amplifier in a feedback circuit. An outdisable circuit controls the voltage and current of the output driver amplifier to place the output in a state in which it appears electrically as an open circuit when the channel is off. Multiple programmable amplifiers can be combined to make a multiplexer, a selectable gain circuit, or a selectable attenuation circuit, all with high band width and high signal integrity.
    Type: Grant
    Filed: February 3, 1995
    Date of Patent: February 4, 1997
    Assignee: Hewlett-Packard Company
    Inventors: Thomas F. Uhling, Keith C. Griggs
  • Patent number: 5586114
    Abstract: An oscilloscope preamplifier includes N inputs and Z outputs. A programmable cross-point multiplexer provides a first operating mode in which each of N inputs is connected to a different output thereby providing a preamplifier with Z channels, a second operating mode in which one input is multiplexed to all the outputs which are interleaved to maximize the sampling rate, and a range of operating modes in between. The programmable multiplexer includes a switching amplifier connected between each input and each output. Dials on the preamp select the mode by causing a microprocessor to program latches which activate or deactivate the switching amplifiers. A voltage divider is connected across inputs of the multiplexer to provide a programmable attenuator with selectable attenuation levels.
    Type: Grant
    Filed: January 27, 1995
    Date of Patent: December 17, 1996
    Assignee: Hewlett-Packard Company
    Inventors: Thomas F. Uhling, Eddie A. Evel
  • Patent number: 5525910
    Abstract: An electronic probe circuit having ac and dc amplifiers and an input compensation subcircuit is enclosed within a trim housing that replicates the electrical effect of the probe housing. The circuit is laser trimmed through ports in the trim housing. The difference between the voltage at 80 nsec and 1.4 .mu.sec points on a step voltage provides a first calibration factor while the difference between the 3 nsec voltage and the 80 nsec voltage provides a second calibration factor. A resistor in the DC amplifier is trimmed to an absolute voltage with a step scan laser cut. A resistor in the AC amplifier is trimmed with a laser L-cut until the difference between the 80 nsec and 1.4 .mu.sec points of the step voltage equals the first calibration factor. A capacitor in the input compensation subcircuit is trimmed until the voltage difference between the 3 nsec and 80 nsec points equals the second calibration factor.
    Type: Grant
    Filed: March 2, 1995
    Date of Patent: June 11, 1996
    Assignee: Hewlett-Packard Company
    Inventors: Thomas F. Uhling, Philip J. Yearsley, Dale L. Pittock, Mark E. Mathews
  • Patent number: 5446260
    Abstract: An electronic probe circuit having ac and dc amplifiers and an input compensation subcircuit is enclosed within a trim housing that replicates the electrical effect of the probe housing. The circuit is laser trimmed through ports in the trim housing. The difference between the voltage at 80 nsec and 1.4 .mu.sec points on a step voltage provides a first calibration factor while the difference between the 3 nsec voltage and the 80 nsec voltage provides a second calibration factor. A resistor in the DC amplifier is trimmed to an absolute voltage with a step scan laser cut. A resistor in the AC amplifier is trimmed with a laser L-cut until the difference between the 80 nsec and 1.4 .mu.sec points of the step voltage equals the first calibration factor. A capacitor in the input compensation subcircuit is trimmed until the voltage difference between the 3 nsec and 80 nsec points equals the second calibration factor.
    Type: Grant
    Filed: January 18, 1994
    Date of Patent: August 29, 1995
    Assignee: Hewlett-Packard Company
    Inventors: Thomas F. Uhling, Philip J. Yearsley, Dale L. Pittock, Mark E. Mathews
  • Patent number: 5428204
    Abstract: An electronic probe circuit having ac and dc amplifiers and an input compensation subcircuit is enclosed within a trim housing that replicates the electrical effect of the probe housing. The circuit is laser trimmed through ports in the trim housing. The difference between the voltage at 80 nsec and 1.4 .mu.sec points on a step voltage provides a first calibration factor while the difference between the 3 nsec voltage and the 80 nsec voltage provides a second calibration factor. A resistor in the DC amplifier is trimmed to an absolute voltage with a step scan laser cut. A resistor in the AC amplifier is trimmed with a laser L-cut until the difference between the 80 nsec and 1.4 .mu.sec points of the step voltage equals the first calibration factor. A capacitor in the input compensation subcircuit is trimmed until the voltage difference between the 3 nsec and 80 nsec points equals the second calibration factor.
    Type: Grant
    Filed: January 18, 1994
    Date of Patent: June 27, 1995
    Assignee: Hewlett-Packard Company
    Inventors: Thomas F. Uhling, Philip J. Yearsley, Dale L. Pittock, Mark E. Mathews
  • Patent number: 5420515
    Abstract: An electronic probe circuit having ac and dc amplifiers and an input compensation subcircuit is enclosed within a trim housing that replicates the electrical effect of the probe housing. The circuit is laser trimmed through ports in the trim housing. The difference between the voltage at 80 nsec and 1.4 .mu.sec points on a step voltage provides a first calibration factor while the difference between the 3 nsec voltage and the 80 nsec voltage provides a second calibration factor. A resistor in the DC amplifier is trimmed to an absolute voltage with a step scan laser cut. A resistor in the AC amplifier is trimmed with a laser L-cut until the difference between the 80 nsec and 1.4 .mu.sec points of the step voltage equals the first calibration factor. A capacitor in the input compensation subcircuit is trimmed until the voltage difference between the 3 nsec and 80 nsec points equals the second calibration factor.
    Type: Grant
    Filed: August 28, 1992
    Date of Patent: May 30, 1995
    Assignee: Hewlett-Packard Company
    Inventors: Thomas F. Uhling, Philip J. Yearsley, Dale L. Pittock, Mark E. Mathews