Hewlett-packard Company

Bruce E Mueller

Todd R Medin

John L Stoffel, Jr

Peter C Morris

William D Meyer

Mark G Wisnosky

Gerold G Firl

Dale R Davis

Stuart D Asakawa

William D Kappele

John Alan Mohr

Albert Such

Rana Raychoudhury

Ramon-Bartolome Pastor Martinez

Carlos Miranda De Larra Carcedo

Michael Klein

A transparent medium for printers and plotters having optical edge and media sensors has one or more reflective strips applied to the non-image side to trip the sensors. The reflective strips can include a narrow strip along one lateral edge to locate the edge, and a wider strip along the other lateral edge to locate the edge and trip the media sensor. The strips are applied by a pressure-sensitive adhesive, and are removed after the printing operations on the medium. The reflective strips can be formed of the same transparent base as the medium, with fillers added to provide sufficient opacity to trip the optical sensors.

Image forming method using transparent printer media with reflective

Transparent printer media with reflective strips for media sensing

Marangoni flow induced print defects are alleviated by underprinting and/or overprinting by a primary ink-jet ink with at least one treating solution that is capable of inducing the precipitation of the colorant in the primary ink-jet ink upon sustained contact. Since the time scale of precipitation is fast compared with the development of print defects due to Marangoni flow, the deleterious effects of Marangoni flow are forestalled. The method of the invention offers an effective and easily-implemented solution to the problem of Marangoni flow induced print defects that supplants the use of specially-treated paper and its associated high cost and inconvenience.

Method for alleviating marangoni flow-induced print defects in ink-jet

A thermal ink jet print device having a phase change material, a solid or fluid, disposed in heat exchange proximity to the thermal ink jet printhead to absorb printhead heat energy by changing physical state at a printhead temperature below that at which unacceptable printing takes place and at a rate commensurate with the rate of heat energy input.

Thermal ink jet print device having phase change cooling

Inks comprising, by weight, from about 4% to about 10% formamide, from about 1% to about 10% dye, and the balance water when printed on paper from an ink-jet printer have improved resistance to bleed, especially when printed at a rate up to about 3.7 kHz.

Inks for bleed-free ink-jet printing on plain paper

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Escondido, CA, United States of America

Bruce E Mueller