Inventor
STOFFEL JOHN L
US31 patents
⚠️ This page may combine multiple inventors who share the name “STOFFEL JOHN L”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HEWLETT PACKARD CO
14 patentsUS5946012AAug 31, 1999
Reliable high performance drop generator for an inkjet printhead
HEWLETT PACKARD CO131 citations98
US5198023AMar 30, 1993
Cationic dyes with added multi-valent cations to reduce bleed in thermal ink-jet inks
HEWLETT PACKARD CO122 citations98
US5874974AFeb 23, 1999
Reliable high performance drop generator for an inkjet printhead
HEWLETT PACKARD CO91 citations97
US4862197AAug 29, 1989
Process for manufacturing thermal ink jet printhead and integrated circuit (IC) structures produced thereby
HEWLETT PACKARD CO104 citations96
US6497479B1Dec 24, 2002
Higher organic inks with good reliability and drytime
HEWLETT PACKARD CO54 citations95
US6521030B1Feb 18, 2003
Inkjet ink sets with high ligthfastness dye
HEWLETT PACKARD CO21 citations92
US6139139AOct 31, 2000
Color inkjet printer with pens containing reactive inks
HEWLETT PACKARD CO29 citations92
US5745140AApr 28, 1998
Color ink-jet printer with pigment black and dye-based color inks
HEWLETT PACKARD CO32 citations92
US4994110AFeb 19, 1991
Dyes containing lithium for ink-jet printing inks
HEWLETT PACKARD CO29 citations92
US4761180AAug 2, 1988
Dyes containing tetramethylammonium cation for ink-jet printing inks
HEWLETT PACKARD CO45 citations92
US5272491ADec 21, 1993
Thermal ink jet print device having phase change cooling
HEWLETT PACKARD CO49 citations91
US5091005AFeb 25, 1992
Inks for bleed-free ink-jet printing on plain paper
HEWLETT PACKARD CO31 citations91
US6458195B1Oct 1, 2002
Use of hydrolyzed Reactive Red 23
HEWLETT PACKARD CO14 citations84
US5880758AMar 9, 1999
Printer with pen containing a low dot spread black ink and a high dot spread color ink
HEWLETT PACKARD CO11 citations73
HEWLETT PACKARD DEVELOPMENT CO
8 patentsUS7591889B2Sep 22, 2009
Dissimilar pigments for use in dark and light inkjet inks
HEWLETT PACKARD DEVELOPMENT CO23 citations92
US6824598B2Nov 30, 2004
Inkjet ink sets with combinations of light dye load and dark dye load
HEWLETT PACKARD DEVELOPMENT CO21 citations92
US7582188B2Sep 1, 2009
Composition and ink receiving system incorporating the composition
HEWLETT PACKARD DEVELOPMENT CO42 citations91
US7553395B2Jun 30, 2009
Print media and methods of making print media
HEWLETT PACKARD DEVELOPMENT CO16 citations82
US7111933B2Sep 26, 2006
Ink-jet systems and methods using visible and invisible ink
HEWLETT PACKARD DEVELOPMENT CO8 citations68
US9068292B2Jun 30, 2015
Uncoated recording media
HEWLETT PACKARD DEVELOPMENT CO3 citations61
US8007096B2Aug 30, 2011
Ink compositions for use in highlighter markers and associated methods
HEWLETT PACKARD DEVELOPMENT CO0 citations49
US9127407B2Sep 8, 2015
Sizing composition
HEWLETT PACKARD DEVELOPMENT CO0 citations36