Hewlett-packard Development Company, L.p.

Bradley D Chung

Anthony M Fuller

Jeremy Harlan Donaldson

Galen P Cook

Garrett E Clark

Ozgur E Yildirim

Bhavin Shah

Manish Giri

Alexander N Govyadinov

Matthew Allen Shepherd

Adam L Ghozeil

Rio Rivas

Mark H MacKenzie

Jason M Quintana

Sterling Chaffins

Qin Liu

Mohammed Saad Shaarawi

Eric Lee Nikkel

Matthew David Giere

Alan R Arthur

Chantelle Domingue

Arun K Agarwal

John Christopher Rudin

Colin C Davis

Benjamin L Clark

Andrew F Phillips

Sean P McClelland

Thomas R Strand

Hsue-Yang Liu

Michael B Hager

Jeffrey K Pew

Siddhartha Bhowmik

Joe E Stout

Daniel Fradl

Samson Berhane

Jon A Crabtree

Valerie J Marty

Huy Le

Thomas P Abadilla

Adrian Kriz

R William Grobman

Michael H Hayes

Daniel B Brown

Alan T Davis

Emmet Whittaker

Frank E Glass

Thomasp Abadilla

Chantelle Elizabeth Domingue

A sample-reagent mixture is thermal cycled through a plurality of cycles. Each thermal cycle includes actuating a heater to heat the sample-reagent mixtures; and dispensing a fluid onto the sample-reagent mixture to cool the sample reagent mixture.

Sample-reagent mixture thermal cycling

In some examples, printing device temperature management may include ascertaining a print speed associated with a print job, and comparing the print speed to a print speed threshold. Printing device temperature management may further include actuating a power supply associated with a print bar at a start position of physical medium to be utilized for printing for the print job, or at or beyond a specified location along a path associated with traversal of the physical medium from the start position to a print zone to reduce an operational temperature associated with the print bar.

Printing device temperature management

A heating device along a slot of a print head is selectively actuated to form temperature gradients within fluid along the slot to facilitate convective fluid flow within and along the slot.

Addressing pigment settling defects in TIJ by using natural convection to stir the ink

A fluid ejection structure can include thermal resistors, a substrate, layers on the substrate, wherein said layers can include a region proximate to the resistor that has reduced field oxide.

Fluid ejection structure

A printer includes a printbar having plural dice partially overlap in the direction of rows and a halftoner. The dice receive nozzle firing data which determines when and where the individual print nozzles are to be operated in order to emit the colorant onto the media so as to form the desired printed image on a media. The halftoner is a bidirectional error diffusion halftoner that is structured to generate halftoned data. The halftoned data is mappable into the firing data. The halftoner includes a serpentine direction reverser which is structured to halftone print data image pixels in a first serpentine direction to form halftoned data and then to halftone print data image pixels in an opposite serpentine direction to form the halftoned data.

Serpentine direction reversal in bidirectional error diffusion halftoning

A method and apparatus provide a resistor electrically connected to an electrically conductive trace.

Resistor

Various methods and apparatus relating to a multi-level layer () are disclosed.

Liquid crystal display with polymer layer of varying thickness and method of producing such a layer

An exemplary embodiment of the present invention provides for a fluid ejection device. The fluid ejection device includes a substrate, a conductive layer, a resistive layer, and at least one upper layer. The conductive layer is disposed on the substrate and an outer perimeter and an inner region thinner than the outer perimeter. The outer perimeter includes conductive elements spaced apart from one another. The resistive layer includes an outer resistive portion overlying the conductive elements and a central resistive portion lying on top of a raised bridge of the substrate, wherein the width of the raised bridge is substantially greater than the width of the central resistive portion. The at least one upper layer defines a boundary of a fluid chamber, and the boundary is aligned vertically above a border of the central resistive portion.

Heating element for a printhead

A printhead comprises a first member and a second member, formed separately from the first member. The second member is nested within a first space defined by the first member. A plurality of fluidic transmission channels is formed between the first and second members to convey ink to an outer surface of the first and second members.

Multi-member, nested printhead

A print head () includes a layer () which at least partially forms firing chambers () and ribs () in contact with opposing side walls of a fluid feed slot () while extending from a first side wall to a second opposite side wall within the fluid feed slot ().

Printhead feed slot ribs

A thermal resistor fluid ejection assembly includes an insulating substrate and first and second electrodes formed on the substrate. A plurality of individual resistor elements of varying widths are arranged in parallel on the substrate and electrically coupled at a first end to the first electrode and at a second end to the second electrode.

Thermal resistor fluid ejection assembly

Various methods and apparatus relating to a multi-level layer are disclosed.

Multi-level layer

A printing device () including a substrate () having an aperture () extending therethrough, wherein the aperture includes a side wall and defines a liquid ink flow path, an ink firing chamber () fluidically connected to the aperture, and a coating positioned on the side wall of the aperture, the coating being impervious to etching by liquid ink, and wherein the coating is chosen from one of silicon dioxide, aluminum oxide, hafnium oxide and silicon nitride.

Printing device

A heating element of a fluid ejection device includes an insulative layer, a resistor portion interposed between and spaced apart from a pair of conductive portions, and an upper structure defining a fluid chamber above the resistor portion. The insulative layer defines a shoulder portion adjacent a side edge of the resistor portion, the shoulder portion vertically spaced below a top surface of the resistor portion by a distance of no more than twice a thickness of the resistor portion.

Heating element

The present disclosure is drawn to dice with polymer ribs. In one example, a die structure can comprise a die having a plurality of die slots, the die having polymer ribs attached to one side thereof, wherein the polymer ribs are attached using a polymer film on one side of the die, said polymer film having portions removed along the die slots to form the polymer ribs which bridge the die slots, thereby forming a plurality of polymer bridged die slots.

Dice with polymer ribs

Growing community of inventors

Corvallis, OR, United States of America

Bradley D Chung