Hewlett-packard Development Company, L.p.

Hewlett-packard Company

Gary W Byers

Richard N Anderson

Keshava A Prasad

Shirley Lee

Mark L Choy

Alexey S Kabalnov

David M Schut

Mark H Kowalski

Richard B Anderson

Amiya K Chatterjee

Ronald Albert Askeland

George Sarkisian

Bor-Jiunn Niu

Raymond J Adamic

Hai Quang Tran

Howard Doumaux

Paul Joseph Bruinsma

Larrie A Deardurff

Hiang P Lauw

Yi-Hua Tsao

Kai-Kong Iu

Christian Schmid

Kai Kong Iu

Richard A Sader

Ervin Mubarekyan

Kai K Lu

Briefly described, embodiments of this disclosure include print media and methods of preparing print media.

Inkjet anti-curl compositions for media and systems for processing the media

A fixer fluid for an inkjet ink set includes an aqueous vehicle, and a tri-alkyl-substituted amine-N-oxide. The fixer fluid also includes an acid, a cationic polyelectrolyte, or combinations of the acid and polyelectrolyte(s).

Fixer fluid and inkjet ink sets including the same

An aqueous printing fluid, comprising a cosolvent, the cosolvent or mixture of compounds comprising at least one inner salt compound having a sp-hybridized nitrogen cation and an associated anionic charge either isolated on an N-substituted oxygen anion bound directly to the sp-hybridized nitrogen cation or isolated among the oxygens of a carboxylate group; a method of avoiding paper curl in printed paper by using the above-described aqueous printing fluid; and a printer system for avoiding paper curl in printed paper through using the above-described aqueous printing fluid.

Cosolvents in printing fluids

Combinations of cationic underprinting fluids and anionic ink compositions that together achieve improved color quality and image stability in ink-jet printed images.

Ink and underprinting fluid combinations with improved inkjet print image color and stability

The present method is drawn to the creation of fast-drying, photo-quality images with an ink-jet inks. The method comprises the steps of providing a inorganic porous media substrate, providing an aqueous ink-jet ink comprising an ink vehicle and an effective amount of a metallized dye having at least one heterocyclic nitrogen ring and an azo bond wherein the heterocyclic nitrogen is chelated or complexed to a transition metal, and jetting the aqueous ink-jet ink onto the inorganic porous media substrate.

Fast drying images and methods for printing on inorganic porous media

Cyan ink formulation

A recording sheet is disclosed comprising a substrate, having on at least one side thereon, an ink absorbent layer, said ink absorbent layer comprising alumina sol, at least one gelling agent, at least one cyclodextrin compound, and optionally, at least one binder. The ink absorbent layer may further comprise at least one viscosity, modifying compound and at least one gloss enhancing compound. The recording sheet of the present invention provides enhanced lightfastness properties.

Recording sheet for ink-jet printing

A method and apparatus for a test pattern used in the alignment of an ink-jet pen which deposits fixer fluid, or other clear ink precursor fluid, or even colored ink fluid, on print media incorporates a colorless chemical marker in the fixer that is either infrared- or ultraviolet-sensitive and can either be observed using IR-sensitive detectors or visually, respectively, upon application of IR (or near-IR) radiation or UV radiation, respectively. Thus, data may be obtained with respect to deviations in a carriage-scan x-axis and a paper scan y-axis. Thus, the teachings of the present invention permit a determination of the extent of misdirected or missing nozzles.

Use of an essentially colorless marker to allow evaluation of nozzle health for printing colorless &ldquo;fixer&rdquo; agents in multi-part ink-jet images

A class of magenta dye chromophores generally described as metal complexes with dye ligands of 4-hydroxy-3-(2'-pyridylazo)-1-(sulfo substituted) naphthalene for use in ink-jet inks is disclosed. The dye ligands are coordinated to a polyvalent metal. The dye-metal complexes of the present invention provide excellent ink-jet prints having excellent lightfastness when exposed to direct sun light as well as office light.

Magenta dyes for ink-jet inks

The center-to-center spacing of pens containing a 'problematic' combination of inks is increased to introduce a relatively small additional time-delay in which those particular constituents are applied to the same or adjacent areas during a single pass, thereby providing a substantial improvement in print qualities (such as Halo or Bleed) on plain (untreated) and special purpose (matt, glossy, transparent) print media, without substantially increasing the throughput rate. The center-to-center spacing of a critical combination of pens is substantially greater than the width of a single pen, thereby providing an increased delay that is equal to the increased spacing divided by the traverse speed. Different delays are provided for different combinations of ink by arranging at least three pens in a fixed sequence with different fixed spacings between different combinations of pens, such that a greater spacing and thus a longer delay is associated with one or more combinations of inks which interact adversely on print quality, and a shorter delay with at least one combination of inks which interacts less adversely on print quality. In particular, if a particular pair of two pens is a 'problematic' combination requiring a longer delay and other pairs are 'safe' combinations requiring a shorter delay, the pair requiring the longer delay may be held in two non-adjacent compartments, possibly separated by one or more other pens. In one particular example, the order is KMCY, which provides an effective center-to-center spacing of 2 pen widths for the two 'problematic' combinations of KC and YM, and a center-to-center spacing of at least 1 pen width for the four safe combinations, thereby providing an economic solution to improve print qualities such as Halo and Bleed by increasing the center-to-center spacing of the pens associated with one or more 'problematic' combinations of inks, without any noticeable change in throughput rate.

Ink jet printer with controlled time-delay between application of

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Vista, CA, United States of America

Gary W Byers