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 ...

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 ...

Paul D Gast, James L McCullough, Albert Serra, Xavier Gros, Jose J Doval, Stefano Schiaffino, Ronald A Askeland, Clayton L Holstun, Scott Norum: Alignment of ink dots in an inkjet printer. Hewlett Packard Company, Brian D Ogonowsky, Skjerven Morrill MacPherson, April 9, 2002: US06367903 (97 worldwide citation)

A misalignment compensation technique for a dot printer is disclosed. This technique first supplies printing instructions to a printhead for energizing printing elements in various groups (primitives) to print a pattern on a medium. The printed pattern is then detected by optical sensors in the prin ...

Arun K Agarwal, Jennifer Korngiebel, Kit Christopher Baughman, Matthew D Giere, Ronald A Askeland, Noah C Lassar, Satya Prakash, Neal W Meyer, Harold Lee Van Nice, Salim Khasawinah: High efficiency orifice plate structure and printhead using the same. Hewlett Packard Company, September 18, 2001: US06290331 (37 worldwide citation)

A novel polymeric orifice plate for a printhead. The plate includes a recess in the top surface thereof which terminates at a position between the top and bottom plate surfaces. The recess communicates with a bore which passes through the remainder of the plate and terminates at the bottom surface. ...

Ronald A Askeland, William D Kappele, Norman E Pawlowski, John L Stoffel: Dyes containing tetramethylammonium cation for ink-jet printing inks. Hewlett Packard Company, William J Bethurum, August 2, 1988: US04761180 (37 worldwide citation)

Inks used in ink-jet printing comprise a vehicle and a dye. The dye is typically an anionic dye, associated with undesirable cations such as sodium or potassium cations. Several properties of such inks are improved by replacing at least about one-fourth of such cations on the anionic dye with tetram ...

Matthew D Giere, Ronald A Askeland, Clayton L Holstun: Print mode for improved leading and trailing edges and text print quality. Hewlett Packard Company, Dennis G Stenstrom, June 19, 2001: US06247787 (36 worldwide citation)

Described is a method for incremental printing with an inkjet swath printer by depositing multiple drops of an ink from a printhead in each column of an image, in each scanning pass of the printhead over a print medium by obtaining the image, analyzing the image to determine which drops of ink will ...

Frank Drogo, Ronald A Askeland, Brian P Canfield: Servicing a newly-installed ink pen to eliminate uneven print quality without excessive wasting of ink. Hewlett Packard Company, June 18, 1996: US05528269 (31 worldwide citation)

An inkjet printer has a pen holder for removably holding an ink pen, a detector circuit for detecting whether ink with a degraded quality is likely to be ejected by said ink pen, and a servicing circuit responsive to said detector circuit for causing an initial quantity of ink to be discharged from ...

David Keller, Ronald A Askeland, Steve Steinfield, Wayne Richard: Nozzle distribution. Hewlett Packard Development Company, July 31, 2007: US07249815 (29 worldwide citation)

A fluid ejection device includes a die having a plurality of nozzles variously configured according to a predetermined intended distribution. The fluid ejection device also includes a controller configured to set a mean drop volume of the die by selectively firing selected nozzles of the die.

Steven W Steinfield, Ronald A Askeland, Jason R Arbeiter: Printer having precision ink drying capability and method of assembling the printer. Hewlett Packard Co, Walter S Stevens, January 21, 2003: US06508552 (26 worldwide citation)

A printer having precision ink drying capability and method of assembling the printer. The printer comprises a print head that is adapted to eject a plurality of ink drops through outlet orifices defined by the print head. The ink drops form a plurality of ink marks at a plurality of locations on a ...

Clayton L Holstun, Ronald A Askeland, Frank Drogo, Brian P Canfield: Method for increased print resolution in the carriage scan axis of an inkjet printer. Hewlett Packard Company, July 30, 1996: US05541625 (24 worldwide citation)

An inkjet printer system fires smaller ink droplets in a single-pass print mode to achieve addressible print resolution of 600 dpi in the carriage scan axis along with 300 dpi resolution in the media advance axis, without having to employ any dot-depletion algorithms. In one embodiment, the system p ...