Loren E Johnson, Hiang P Lauw, Norman E Pawlowski, James P Shields, John M Skene: Thermal ink-jet inks having reduced black to color and color to color bleed. Hewlett Packard Company, July 16, 1996: US05536306 (57 worldwide citation)

A set of thermal ink-jet inks and method for formulating the same are provided in which the cyan, magenta, and yellow inks contain a combination of surfactants and inorganic salts designed to reduce both color to color bleed as well as black to color bleed. In general, the present cyan, magenta, and ...

Norman E Pawlowski, Loren E Johnson, Hiang P Lauw, James P Shields, Zia Rehman: Use of co-surfactants to adjust properties of ink-jet inks. Hewlett Packard Company, May 6, 1997: US05626655 (54 worldwide citation)

An ink-jet ink composition is provided which includes at least one primary surfactant and at least one co-surfactant, with the co-surfactant having an HLB at least about 1.5 units higher than that of the primary surfactant. The co-surfactant imparts good wetting and cloud point characteristics to th ...

Hiang P Lauw: Specific dye set for thermal ink-jet printing. Hewlett Packard Company, July 9, 1996: US05534051 (44 worldwide citation)

A specific dye set is provided for use with thermal ink-jet color printers, such as Hewlett-Packard Company's DeskJet.RTM. printer. The dye set comprises Direct Blue 199 and Acid Blue 9 (cyan), Reactive Red 180 and Acid Red 52 (magenta), and Acid Yellow 23 (yellow), of which Direct Blue 199 is treat ...

John R Moffatt, Hiang P Lauw: Formulation for control of paper cockle in thermal ink-jet printing. Hewlett Packard Company, May 4, 1993: US05207824 (42 worldwide citation)

Paper cockle, which results from printing inks having a high water content, is reduced in thermal ink-jet inks by adding abut 15 to 50 wt % of an anti-cockle agent comprising a compound selected from the group consisting of hexaethylene glycol and an organic compound having from four to eight carbon ...

Donald E Wenzel, Loren E Johnson, Hiang P Lauw: Dye preparation for thermal ink-jet printheads using ion exchange. Hewlett Packard Company, William J Bethurum, November 22, 1988: US04786327 (33 worldwide citation)

A process is provided for reducing the crusting propensity of dyes, complexed with sodium or other cations, used in ink-jet print heads and for improving other properties of such dyes. The process comprises replacing at least a portion of the cations on such dyes with preselected cations, such as th ...

Hiang P Lauw: Bleed resistance of dyes by counter-ion substitution. Hewlett Packard Corporation, August 30, 1994: US05342439 (31 worldwide citation)

Color bleed on paper media printed by ink-jet is alleviated by altering the dyes such that they become more bleed resistant. To this end, an organic compound with surfactant properties is substituted as the dye counter-ion. Specifically, a dye having one or more sulfonate or carboxylate groups is pr ...

Larrie A Deardurff, Hiang P Lauw, Mary E Austin: Dye set for improved ink-jet image quality. Hewlett Packard Company, January 12, 1999: US05858075 (28 worldwide citation)

In accordance with the invention a set of dyes suitable for use in ink-jet inks and method for formulating the same are provided. The yellow ink of the present invention contains a yellow colorant having a CIELAB hue angle, h.degree., less than 90.degree. to provide a true representation of colors, ...

John R Moffatt, Edward T Bedford, Hiang P Lauw: Ink-jet inks for improved print quality. Hewlett Packard Company, August 10, 1999: US05935309 (22 worldwide citation)

An ink-jet ink composition for ink-jet printing and a method using the same is disclosed, the ink composition comprising an aqueous liquid vehicle, at least one zwitterionic surfactant; and at least one amphiphilic dye, said at least one amphiphilic dye comprising a plurality of amphiphilic dye mole ...

Larrie A Deardurff, Mary E Austin, Hiang P Lauw: Ink-jet inks for improved image quality. Hewlett Packard Company, Soodabeh Tronson, August 4, 1998: US05788754 (18 worldwide citation)

Thermal ink-jet inks are provided containing a colorant and a vehicle, the vehicle comprising from about 8 to about 20 wt % of a 1,2-diol, from about 0.1 to about 5 wt % of at least one non-ionic surfactant, and optionally 0 to about 5 wt. % of a aliphatic alcohol; 0 to about 1.5 wt % of at least on ...

Raymond J Adamic, Richard A Sader, Gary W Byers, Paul J Bruinsma, Howard A Doumaux, Kai Kong Iu, Richard Anderson, Hiang P Lauw: Cyan ink formulation. Hewlett Packard Development Company, W Bradley Haymond, August 19, 2003: US06607589 (17 worldwide citation)

An aqueous inkjet ink and an ink set using such ink, the ink comprising as colorant, a Copper Phthalocyanine (CuPc) dye compound having formula II: