公开(公告)号：US10336070B2

公开(公告)日：2019-07-02

申请号：US15747966

申请日：2015-10-30

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： Nicholas Matthew Cooper McGuinness ,  Alexander Govyadinov ,  Chris Bakker ,  Lawrence H. White ,  Paul A. Richards

IPC: B41J2/14

Abstract: According to an example, a fluid ejection device may include a fluid feed slot, a plurality of fluid ejection chambers in fluid communication with the fluid feed slot, a plurality of drop ejecting elements, in which a drop ejecting element of the plurality of drop ejecting elements is positioned within each of the plurality of fluid ejection chambers, a fluid circulation channel in fluid communication at a first end of the fluid circulation channel with the fluid feed slot and in fluid communication at multiple second ends of the fluid circulation channel with the plurality of fluid ejection chambers, and a fluid circulating element within the fluid circulation channel. The fluid ejection device may also include a bubble dissipating structure positioned within the fluid circulation channel outside of the plurality of fluid ejection chambers.

公开(公告)号：US10099484B2

公开(公告)日：2018-10-16

申请号：US15520338

申请日：2014-10-30

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： Alexander Govyadinov ,  Adam L Ghozeil ,  Boon Bing Ng ,  Patrick Leonard ,  Raymond Connolly

IPC: B41J2/175 ,  B41J2/18

Abstract: A print head has an ink slot and a sensing chamber having a first port connected to the fluid slot and a second port. The sensing chamber contains an ink level sensor. A recirculation passage extends from the fluid slot and is fluidly coupled to the second port. A fluid pump circulates fluid through the recirculation passage.

公开(公告)号：US20180290458A1

公开(公告)日：2018-10-11

申请号：US15570634

申请日：2015-07-14

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： Alexander Govyadinov ,  Ron Burns ,  Erik D. Torniainen ,  Galen P. Cook ,  David P. Markel ,  Garrard Hume ,  Chris Bakker

IPC: B41J2/175 ,  B41J2/18 ,  B41J2/14

Abstract: A fluid recirculation channel for dispensing a plurality of fluid drop weights includes a number of sub-channels. The sub-channels include at least one pump channel, and a plurality of drop generator channels fluidically coupled to the at least one pump channel. The fluid recirculation channel further includes a number of pump generators incorporated into the at least one pump channel, a number of drop generators incorporated into drop generator channels, and a plurality of nozzles defined within the drop generator channels, the nozzles being at least as numerous as the number of drop generators.

公开(公告)号：US20180229499A1

公开(公告)日：2018-08-16

申请号：US15516436

申请日：2014-10-29

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： Alexander Govyadinov ,  Paul A Richards

IPC: B41J2/14 ,  B41J2/175

CPC classification number: B41J2/14056 ,  B41J2/1404 ,  B41J2/14088 ,  B41J2/175 ,  B41J2002/14467 ,  B41J2202/12

Abstract: A fluid ejection device includes a fluid slot, a fluid ejection chamber communicated with the fluid slot, a drop ejecting element within the fluid ejection chamber, a fluid circulation channel communicated at one end with the fluid slot and communicated at another end with the fluid ejection chamber, a fluid circulating element within the fluid circulation channel, and a channel wall separating the fluid ejection chamber and the fluid circulation channel. The fluid circulation channel includes a channel loop, and a width of the channel wall is based on a width of the channel loop and a width of the fluid ejection chamber.

公开(公告)号：US09969177B2

公开(公告)日：2018-05-15

申请号：US15433827

申请日：2017-02-15

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： Alexander Govyadinov ,  Craig Olbrich ,  Brian M. Taff

IPC: B41J2/175 ,  B41J2/15 ,  B41J2/14

CPC classification number: B41J2/17596 ,  B41J2/1404 ,  B41J2/14145 ,  B41J2/1433 ,  B41J2/15 ,  B41J2/175 ,  B41J2002/14387 ,  B41J2002/14467 ,  B41J2202/12

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.

公开(公告)号：US20180043687A1

公开(公告)日：2018-02-15

申请号：US15546936

申请日：2015-04-30

Applicant: Hewlett-Packard Development Company, L.P.

Inventor： Alexander Govyadinov ,  Charles M. Santori ,  Anita Rogacs ,  Diane R. Hammerstad ,  Manish Giri

IPC: B41J2/125 ,  G01N21/85

CPC classification number: B41J2/125 ,  B01L3/502707 ,  B01L3/502715 ,  B01L2300/0627 ,  B01L2400/0442 ,  B41J2/175 ,  B41J2/195 ,  G01N15/14 ,  G01N21/27 ,  G01N21/64 ,  G01N21/6454 ,  G01N21/85 ,  G01N2015/1486 ,  G01N2015/149 ,  G01N2015/1493 ,  G01N2021/8557 ,  G01V8/12

Abstract: Provided in one example is an apparatus, including a substrate supporting a microfluidic channel, a bubble jet inertial pump supported by the substrate adjacent the microfluidic channel to pump fluid through the microfluidic channel and an optical sensor on a first side of the microfluidic channel. A light emitter on a second side of the microfluidic channel is to pass light across the microfluidic channel to the optical sensor.

公开(公告)号：US20180023987A1

公开(公告)日：2018-01-25

申请号：US15546327

申请日：2015-04-30

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： Alexander Govyadinov ,  Erik D Torniainen ,  Pavel Kornilovich

IPC: G01F1/684 ,  B01L3/00 ,  G01F1/69 ,  B41J2/125

CPC classification number: G01F1/6845 ,  B01L3/502746 ,  B01L2300/0627 ,  B01L2300/0887 ,  B01L2400/082 ,  B41J2/125 ,  B41J2/175 ,  G01F1/69 ,  G01F1/6986

Abstract: An apparatus includes a microfluidic channel and a flow sensor along the microfluidic channel. The flow sensor includes a heat emitting resistor for connection to an electric current source, analytical parameter sensor and electronics. The heat emitting resistor has a resistance that varies in response to temperature. The electrical parameter sensor is to sense an electrical parameter of the heat emitting resistor that is based on the resistance of the heat emitting resistor. The electronics determine a flow based on the sensed electrical parameter.

公开(公告)号：US20170361505A1

公开(公告)日：2017-12-21

申请号：US15513965

申请日：2014-09-26

Applicant: Hewlett-Packard Development Company, L.P.

Inventor： James Elmer Abbott, JR. ,  Alexander Govyadinov ,  Vladek Kasperchik ,  Krzysztof Nauka ,  Sivapackia Ganapathiappan ,  Lihua Zhao ,  Howard S. Tom, JR. ,  Yan Zhao ,  Hou T. Ng

IPC: B29C35/08 ,  B29C67/00 ,  B29C64/165 ,  B29C64/205 ,  B29C64/386 ,  B33Y10/00

CPC classification number: B29C35/0805 ,  B29C64/165 ,  B29C64/205 ,  B29C64/291 ,  B29C64/386 ,  B29C67/0007 ,  B29C2035/0838 ,  B33Y10/00 ,  B33Y30/00

Abstract: In one example, a lighting device for an additive manufacturing machine includes an array of light sources each to emit monochromatic light within a band of wavelengths that includes a peak light absorption of a liquid coalescing agent to be dispensed on to a build material.

公开(公告)号：US20170313063A1

公开(公告)日：2017-11-02

申请号：US15521284

申请日：2014-10-31

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： Alexander Govyadinov ,  Paula A Richards ,  Chris Bakker

IPC: B41J2/14

CPC classification number: B41J2/1404 ,  B41J2/14056 ,  B41J2/14201 ,  B41J2/175 ,  B41J2002/14306 ,  B41J2002/14467 ,  B41J2202/12

Abstract: A fluid ejection device includes a fluid slot, at least one fluid ejection chamber communicated with the fluid slot, a drop ejecting element within the at least one fluid ejection chamber, a fluid circulation channel communicated with the fluid slot and the at least one fluid ejection chamber, and a fluid circulating element communicated with the fluid circulation channel. The fluid circulating element is to provide on-demand circulation of fluid from the fluid slot through the fluid circulation channel and the at least one fluid ejection chamber.

公开(公告)号：US20170305169A1

公开(公告)日：2017-10-26

申请号：US15521286

申请日：2014-10-31

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： Alexander Govyadinov ,  Tommy D Deskins

IPC: B41J2/18

CPC classification number: B41J2/18 ,  B41J2/1404 ,  B41J2/14056 ,  B41J2/175 ,  B41J2002/14467 ,  B41J2202/12

Abstract: A fluid ejection device includes a fluid slot, a plurality of fluid ejection chambers communicated with the fluid slot, a plurality of drop ejecting elements one of each within one of the fluid ejection chambers, a fluid circulation channel communicated with the fluid slot and one or more of the fluid ejection chambers, and a fluid circulating element communicated with the fluid circulation channel. The fluid circulating element is to provide continuous circulation of fluid from the fluid slot through the fluid circulation channel and the one or more of the fluid ejection chambers.