Patents by Inventor Alexander A. Govyadinov

Alexander A. Govyadinov 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).

  • Method of detecting drops
    Patent number: 9132629
    Abstract: A liquid dispensing device (10), including a drop ejection device (12) including an orifice (18) adapted for ejecting drops therefrom, a single detection device (28) positioned to receive drop information from the ejected drops of the drop ejection device, and a controller (40) that receives the drop information and uses the drop information to determine a number of drops ejected from the drop ejection device.
    Type: Grant
    Filed: October 15, 2008
    Date of Patent: September 15, 2015
    Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Kenneth Ward, Alexander Govyadinov
  • Drop detection assembly and method
    Patent number: 9134233
    Abstract: A drop detection method comprises ejecting an ink drop that includes a fluorescent agent, illuminating the ink drop in flight with excitation light to excite the fluorescent agent, detecting fluorescence emitted by the drop in flight, having a longer wavelength than a wavelength of the excitation light, and, prior to such detecting, filtering out light having a shorter wavelength than the fluorescence wavelength; and a printer with drop detection assembly for performing the method.
    Type: Grant
    Filed: May 31, 2011
    Date of Patent: September 15, 2015
    Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Brian M. Taff, Alexander Govyadinov
  • Fluid ejection device including recirculation system
    Patent number: 9090084
    Abstract: A fluid ejection device including, at least, one recirculation system is disclosed. Such recirculation system contains, at least, one drop generator, recirculation channels that include an inlet channel, an outlet channel and a connection channel and a fluid feedhole that communicates with the drop generator via the inlet channel and the outlet channel of the recirculation channel. Also disclosed are inkjet pen containing it and method of using it.
    Type: Grant
    Filed: May 21, 2010
    Date of Patent: July 28, 2015
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Alexander Govyadinov, Erik D. Torniainen, David P. Markel
  • MICROFLUIDIC MIXING DEVICE
    Publication number: 20150190767
    Abstract: In one embodiment, a microfluidic mixing device includes a mixing channel, a fluid inlet chamber to pass fluids into the mixing channel, an axis-asymmetric mixing actuator integrated within the channel to cause fluid displacements that mix the fluids as they flow through the channel, and an outlet chamber to receive the mixed fluids.
    Type: Application
    Filed: September 24, 2012
    Publication date: July 9, 2015
    Inventors: Alexander Govyadinov, Erik D. Torniainen, David P. Markel, Pavel Kornilovich
  • DROP DETECTION
    Publication number: 20150116406
    Abstract: Drop detection are disclosed. An example liquid dispensing device includes a controller to control dispensing of a first drop from a first orifice and a second drop from a second orifice, a sensor to monitor the first orifice to detect at least one of a presence or an absence of a drop from the first orifice and, in response to the sensor detecting an absence of the first drop, the controller is to classify the first orifice as at least one of occluded or non-functioning.
    Type: Application
    Filed: January 2, 2015
    Publication date: April 30, 2015
    Inventors: Kenneth Ward, Alexander Govyadinov
  • Fluid Ejection Assembly with Circulation Pump
    Publication number: 20150091989
    Abstract: A fluid ejection assembly includes a fluid slot, a recirculation channel, and a drop ejection element within the recirculation channel. A pump element is configured to pump fluid to and from the fluid slot through the recirculation channel. A first addressable drive circuit associated with the drop ejection element and a second addressable drive circuit associated with the pump element are capable of driving the drop ejection element and the pump dement simultaneously.
    Type: Application
    Filed: December 9, 2014
    Publication date: April 2, 2015
    Inventors: Alexander Govyadinov, Jason Oak
  • Fluid ejection device with fluid displacement actuator and related methods
    Patent number: 8991954
    Abstract: In an embodiment, a method of circulating fluid in a fluid ejection device includes generating compressive and expansive fluid displacements of different durations from a first actuator located asymmetrically within a fluidic channel between a first fluid feedhole and a nozzle while generating no fluid displacements from a second actuator located asymmetrically within the channel between the nozzle and a second fluid feedhole.
    Type: Grant
    Filed: August 31, 2011
    Date of Patent: March 31, 2015
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Alexander Govyadinov, Kianoush Naeli, Tony S. Cruz-Uribe
  • Determining an Issue in an Inkjet Nozzle with Impedance Measurements
    Publication number: 20150029252
    Abstract: A method for determining an issue in an inkjet nozzle with impedance measurements, includes taking a first impedance measurement to detect a drive bubble with an impedance sensor, and taking a second impedance measurement to detect said drive bubble with said impedance sensor after said first impedance measurement.
    Type: Application
    Filed: April 19, 2012
    Publication date: January 29, 2015
    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Andrew L. Van Brocklin, Eric T. Martin, Alexander Govyadinov, David Maxfield
  • Detecting defective nozzles
    Patent number: 8939542
    Abstract: A method of detecting a defective nozzle within a nozzle array, may comprise grouping each nozzle with a number of other nozzles within the nozzle array, measuring fluid output from each group of nozzles with a fluid detector, individually regrouping each nozzle within a group of nozzles whose fluid output is detected as not being commensurate with the amount of fluid that should be ejected from that group with a number of known non-defective nozzles to form a number of subsequent groups, and measuring fluid output from the subsequent groups of nozzles to determine which nozzle among the subsequent groups of nozzles is defective.
    Type: Grant
    Filed: June 24, 2013
    Date of Patent: January 27, 2015
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Alexander Govyadinov, Clayton L. Holstun
  • Fluid ejection assembly with circulation pump
    Patent number: 8939531
    Abstract: A fluid ejection assembly includes a fluid slot, a recirculation channel, and a drop ejection element within the recirculation channel. A pump element is configured to pump fluid to and from the fluid slot through the recirculation channel. A first addressable drive circuit associated with the drop ejection element and a second addressable drive circuit associated with the pump element are capable of driving the drop ejection element and the pump element simultaneously.
    Type: Grant
    Filed: October 28, 2010
    Date of Patent: January 27, 2015
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Alexander Govyadinov, Jason Oak
  • MICROFLUIDIC MIXING DEVICE
    Publication number: 20140377145
    Abstract: A microfluidic mixing device comprises a main channel and a number of secondary channels extending from a portion of the main channel and entering another portion of the main channel. A number of actuators are located in the secondary channels to pump fluids through the secondary channels. A microfluidic mixing system comprises a microfluidic mixing device. The microfluidic mixing device comprises a main fluid mixing channel, a number of main channel actuators to pump fluid through the main fluid mixing channel, a number of secondary channels fluidly coupled to the main fluid mixing channel, and a number of secondary channel actuators to pump fluids through the secondary channels. The microfluidic mixing device also comprises a fluid source, and a control device to provide fluids from the fluid source to the microfluidic mixing device and activate the main channel actuators and secondary channel actuators.
    Type: Application
    Filed: June 24, 2013
    Publication date: December 25, 2014
    Inventors: Alexander Govyadinov, Pavel Kornilovich, Erik D. Torniainen, David P. Markel
  • DETECTING DEFECTIVE NOZZLES
    Publication number: 20140375718
    Abstract: A method of detecting a defective nozzle within a nozzle array, may comprise grouping each nozzle with a number of other nozzles within the nozzle array, measuring fluid output from each group of nozzles with a fluid detector, individually regrouping each nozzle within a group of nozzles whose fluid output is detected as not being commensurate with the amount of fluid that should be ejected from that group with a number of known non-defective nozzles to form a number of subsequent groups, and measuring fluid output from the subsequent groups of nozzles to determine which nozzle among the subsequent groups of nozzles is defective.
    Type: Application
    Filed: June 24, 2013
    Publication date: December 25, 2014
    Inventors: Alexander Govyadinov, Clayton L. Holstun
  • SLOT-TO-SLOT CIRCULATION IN A FLUID EJECTION DEVICE
    Publication number: 20140362143
    Abstract: In an embodiment, a fluid ejection device includes a die substrate having first and second fluid slots along opposite substrate sides and separated by a substrate central region. First and second internal columns of closed chambers are associated with the first and second slots, respectively, and the internal columns are separated by the central region. Fluidic channels extending across the central region fluidically couple closed chambers from the first internal column with closed chambers from the second internal column. Pump actuators in each closed chamber pump fluid through the channels from slot to slot.
    Type: Application
    Filed: September 28, 2011
    Publication date: December 11, 2014
    Inventors: Alexander Govyadinov, Craig Olbrich, Brian M. Taff
  • Determining an issue with an inkjet nozzle using an impedance difference
    Patent number: 8899709
    Abstract: A method for determining an issue with an inkjet nozzle using an impedance difference includes taking a first impedance measurement with a sensor to detect a drive bubble in an ink chamber after a drive bubble formation mechanism is activated; and subtracting the first impedance measurement from a reference.
    Type: Grant
    Filed: April 19, 2012
    Date of Patent: December 2, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Alexander Govyadinov, Andrew L. Van Brocklin, Eric T. Martin, David Maxfield
  • Drop detection
    Patent number: 8864289
    Abstract: A drop detector assembly is provided including an ejection element to eject a fluid drop, a light guide to selectively receive light scattered off of the fluid drop, and a light detector formed in the light guide to detect light received by the light guide.
    Type: Grant
    Filed: March 20, 2011
    Date of Patent: October 21, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Alexander Govyadinov, Chien-Hua Chen
  • Drop detector assembly and method
    Patent number: 8770707
    Abstract: A drop detector assembly includes an ejection element formed on a substrate to eject a fluid drop, and a light detector formed on the substrate to detect light scattered off of the fluid drop. A fluid drop ejected from a nozzle formed in a transparent nozzle plate scatters light that is detected through the transparent nozzle plate.
    Type: Grant
    Filed: September 2, 2010
    Date of Patent: July 8, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Alexander Govyadinov, Andrew L. Van Brocklin, Donald W. Schulte, Terry McMahon
  • Fluid ejection assembly with circulation pump
    Patent number: 8757783
    Abstract: A fluid ejection assembly includes a fluid slot formed in a first substrate and a channel formed in a chamber layer disposed on top of a second substrate. The bottom surface of the second substrate is adhered to the top surface of the first substrate and fluid feed holes are formed between the fluid slot and the channel. A fluid ejection element is at a first end of the channel and a pump element is at a second end of the channel to circulate fluid horizontally through the channel and vertically through the fluid feed holes.
    Type: Grant
    Filed: July 28, 2010
    Date of Patent: June 24, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Alexander Govyadinov, Erik D. Torniainen, Robert Messenger
  • Microcalorimeter systems
    Patent number: 8740453
    Abstract: In one embodiment, a microcalorimeter system includes a first microfluidic channel coupling a calorimeter with a sample chamber. A second microfluidic channel couples the calorimeter with a waste chamber. An inertial pump includes a fluid actuator integrated asymmetrically within the first microfluidic channel, and the fluid actuator is capable of selective activation to pump fluid from the sample chamber to the calorimeter and from the calorimeter to the waste chamber through the first and second microfluidic channels, respectively.
    Type: Grant
    Filed: March 31, 2011
    Date of Patent: June 3, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Erik D. Torniainen, Pavel Kornilovich, Alexander Govyadinov, David P. Markel
  • Fluid ejection device with circulation pump
    Patent number: 8721061
    Abstract: A fluid ejection device includes a fluid recirculation channel, and a drop generator disposed within the channel. A fluid slot is in fluid communication with each end of the channel, and a piezoelectric fluid actuator is located asymmetrically within the recirculation channel to cause fluid flow from the fluid slot, through the recirculation channel and drop generator, and back to the fluid slot.
    Type: Grant
    Filed: January 31, 2011
    Date of Patent: May 13, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Alexander Govyadinov, Paul J Benning
  • FLUID EJECTION DEVICE WITH FLUID DISPLACEMENT ACTUATOR AND RELATED METHODS
    Publication number: 20140118431
    Abstract: In an embodiment, a method of circulating fluid in a fluid ejection device includes generating compressive and expansive fluid displacements of different durations from a first actuator located asymmetrically within a fluidic channel between a first fluid feedhole and a nozzle while generating no fluid displacements from a second actuator located asymmetrically within the channel between the nozzle and a second fluid feedhole.
    Type: Application
    Filed: August 31, 2011
    Publication date: May 1, 2014
    Inventors: Alexander Govyadinov, Kianoush Naeli, Tony S. Cruz-Uribe