1
Ronald A Askeland, Mark S Hickman: Multi-chamber ink supply. Hewlett Packard Company, October 3, 2000: US06126268 (126 worldwide citation)

An ink-jet printing system and ink supply configuration are disclosed that can utilize the advantages of reactive inks while allowing for maximum flexibility in the design and architecture of the ink-jet printing system. The ink-jet printing apparatus comprises a printhead portion having at least th ...


2
Mark S Hickman, Loren E Johnson, John L Stoffel, Ronald A Askeland, Catherine B Hunt, Howard Matrick, Keshava A Prasad, John T Rich, Leonard Slevin, John R Moffatt: Aqueous ink compositions containing anti-curl agents. E I Du Pont de Nemours and Company, October 18, 1994: US05356464 (123 worldwide citation)

Aqueous ink compositions containing anti-curl agents substantially reduce or eliminate paper curl in plain-paper printed elements without adversely effecting storage stability, decap properties or print quality, and thus eliminate the need for expensive and bulky mechanical curl-arresting devices or ...


3
Mark S Hickman: Printing of pixel locations by an ink jet printer using multiple nozzles for each pixel or pixel row. Hewlett Packard Company, October 16, 1990: US04963882 (114 worldwide citation)

An ink jet printer (60) prints dots (30) of colorant at pixel locations using a printing strategy that reduces the visual impact of improperly operating or inoperable nozzles (18), by using multiple nozzles (18) per pixel location or per pixel row. In one approach, used either for single color or mu ...


4
Mark S Hickman: Print quality of dot printers. Hewlett Packard Company, Roland I Griffin, Edward Marker II, October 23, 1990: US04965593 (80 worldwide citation)

The quality of the images of dot printers such as ink jet printers (20) is improved by spacing the ink jet nozzles (52) of the print head (50) by an amount greater than the pixel spacing of the printing medium (22), and operating the sources in a manner such that adjacent pixels are not printed unti ...


5
Steven O Miller, William J Allen, David M Wetchler, Mark S Hickman: Automatic optimization of hardcopy output. Hewlett Packard Company, Flory L Martin, July 10, 2001: US06257693 (71 worldwide citation)

A method of automatically optimizing the controllable parameters related to producing printed material on a hardcopy output device is provided, along with a hardcopy output device configured for implementing this method. Users require different types of printed objects to have different characterist ...


6
Paul David Gast, Mark S Hickman, David H Donovan, Xavier Gros, Antoni Gil Miquel: Inkjet printhead calibration. Hewlett Packard Company, June 20, 2000: US06076915 (57 worldwide citation)

In various methods, image registration variations among test patterns are used to calibrate misalignment among one or more printheads, paper advance distance, different portions of an inkjet printhead, or bidirectional printhead alignment. A set of test patterns are printed. Each pattern includes a ...


7
Brent W Richtsmeier, Alpha N Doan, Mark S Hickman: Staggered pens in color thermal ink-jet printer. Hewlett Packard Company, December 27, 1994: US05376958 (37 worldwide citation)

A color ink jet printer including a print carriage movable along a carriage scan axis and a plurality of color producing ink jet printheads supported by the print carriage and offset relative to each other so that their nozzle arrays are non-overlapping along the media scan axis, such that the nozzl ...


8
Mark S Hickman: Hard copy print media size and position detection. Hewlett Packard Company, November 28, 2000: US06154240 (35 worldwide citation)

A method and apparatus for determining media size and width and position by detection on a vacuum platen. Detection is provided by using electrical signals from vacuum ports arranged in an X-Y array in the platen. The electrical signals are capable of interfacing with digital circuitry. The X-Y arra ...


9
Paul W Martin, Cathy A Rotering, Mark S Hickman, Chris Lesniak: Print medium handling system including cockle ribs to control pen-to-print medium spacing during printing. Hewlett Packard Company, February 28, 1995: US05393151 (34 worldwide citation)

A printer mechanism to control pen-to-print medium spacing during printing is described. The preferred embodiment of the mechanism includes a printhead and an adjacent platen, the printhead and the platen defining a print zone therebetween. The platen includes ribs adapted for contacting a lower sur ...


10
Ronald S Gompertz, Mark S Hickman, Michael D Dobbs: Imaging cartridge system for inkjet printing mechanisms. Hewlett Packard Company, Flory L Martin, April 21, 1998: US05742306 (32 worldwide citation)

An imaging inkjet cartridge system for an inkjet printing mechanism provides near photographic image quality, as well as crisp black text and line art. In a multi-pen carriage, typically for a tri-chamber full color (e.g. cyan, magenta and yellow) cartridge and a monochrome (e.g. black) cartridge, t ...