1
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 ...


2
John L Stoffel, David H Donovan, Loren E Johnson, John R Moffatt: Aqueous inks having improved halo characteristics. E I Du Pont de Nemours and Company, March 28, 1995: US05401303 (82 worldwide citation)

Halo effect seen at the interface between a first ink, exhibiting sharp edge acuity, and a second ink, having low surface energy, is addressed by adding certain fluorocarbon compounds to the first ink. Edge acuity of the first ink is maintained.


3
John L Stoffel: Cationic dyes with added multi-valent cations to reduce bleed in thermal ink-jet inks. Hewlett Packard Company, March 30, 1993: US05198023 (80 worldwide citation)

An ink set is provided in which bleed between yellow and black inks is reduced by using a cationic yellow dye in the yellow ink and an anionic dye in the black ink. Bleed is further reduced by adding a multi-valent precipitating agent to the yellow ink. With regard to bleed between yellow and other ...


4
John L Stoffel: Process for manufacturing thermal ink jet printhead and integrated circuit (IC) structures produced thereby. Hewlett Packard Co, William J Bethurum, August 29, 1989: US04862197 (59 worldwide citation)

A new and improved thermal ink jet printhead and fabrication process therefor are described. In one embodiment of this invention, heater resistors are formed on one area of an insulating substrate and relative large area electrical contacts are formed on an adjacent area of the insulating substrate. ...


5
Kenneth J Courian, John L Stoffel, Richard A Sader, Keshava A Prasad, Steven L Webb, David H Donovan, Jules G Moritz III, Brian J Keefe, Steven W Steinfield, Winthrop D Childers: Reliable high performance drop generator for an inkjet printhead. Hewlett Packard Co, August 31, 1999: US05946012 (44 worldwide citation)

An inkjet drop ejection system comprises a combination of printhead components and ink, mutually tuned to maximize operating characteristics of the printhead and print quality and dry time of the ink. Use of a short shelf (distance from ink source to ink firing element), on the order of 55 microns, ...


6
John L Stoffel, Arthur C Shor, Harry J Spinelli, Sheau Hwa Ma, Howard Matrick, Mark L Choy, Loren E Johnson: Process for alleviating bleed in printed elements. E I Du Pont de Nemours and Company, September 10, 1996: US05555008 (43 worldwide citation)

A process for alleviating bleed and improving color in printed elements comprises applying an anionic printing liquid and a cationic printing liquid to a substrate adjacent to one another, wherein at least one of the printing liquids contains a polymer and reacting the anionic and cationic printing ...


7
John L Stoffel, Anne M Kelly Rowley, Keshava A Prasad: Higher organic inks with good reliability and drytime. Hewlett Packard Company, December 24, 2002: US06497479 (41 worldwide citation)

An inkjet ink is provided that has a greater organic content than prior art inks. However, it is not simply enough to increase the organic content; other factors must be considered as well. These include controlling viscosity and surface tension, as well as maintaining acceptable drytime. An inkjet ...


8
Kenneth J Courian, John L Stoffel, Richard A Sader, Keshava A Prasad, Steven L Webb, David H Donovan, Jules G Moritz III, Brian J Keefe, Steven W Steinfield, Winthrop D Childers: Reliable high performance drop generator for an inkjet printhead. Hewlett Packard Company, February 23, 1999: US05874974 (37 worldwide citation)

An inkjet drop ejection system comprises a combination of printhead components and ink, mutually tuned to maximize operating characteristics of the printhead and print quality and dry time of the ink. Use of a short shelf (distance from ink source to ink firing element), on the order of 55 microns, ...


9
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 ...


10
Stuart D Asakawa, John A Mohr, John L Stoffel, William D Kappele, Bruce E Mueller, Gerold G Firl: Thermal ink jet print device having phase change cooling. Hewlett Packard Company, E F Oberheim, December 21, 1993: US05272491 (25 worldwide citation)

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 r ...