Inventor
UNDERWOOD JOHN A
ES38 patents
⚠️ This page may combine multiple inventors who share the name “UNDERWOOD JOHN A”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HEWLETT PACKARD CO
26 patentsUS6203147B1Mar 20, 2001
Electrical and fluidic interface for an ink supply
HEWLETT PACKARD CO135 citations98
US6109722AAug 29, 2000
Ink jet printing system with pen alignment and method
HEWLETT PACKARD CO89 citations98
US5956057ASep 21, 1999
Ink container having electronic and mechanical features enabling plug compatibility between multiple supply sizes
HEWLETT PACKARD CO110 citations98
US6183077B1Feb 6, 2001
Method and apparatus for keying ink supply containers
HEWLETT PACKARD CO114 citations96
US6142617ANov 7, 2000
Ink container configured for use with compact supply station
HEWLETT PACKARD CO67 citations96
US6033064AMar 7, 2000
Inkjet printer with off-axis ink supply
HEWLETT PACKARD CO123 citations96
US5547181AAug 20, 1996
Media sheet pick and feed system
HEWLETT PACKARD CO76 citations96
US4990011AFeb 5, 1991
Sheet alignment using reverse advance roll and stationary pick roll
HEWLETT PACKARD CO60 citations96
US6364472B1Apr 2, 2002
Method and apparatus for keying ink supply containers
HEWLETT PACKARD CO46 citations95
US6234602B1May 22, 2001
Automated ink-jet printhead alignment system
HEWLETT PACKARD CO84 citations95
US6554390B2Apr 29, 2003
Test pattern implementation for ink-jet printhead alignment
HEWLETT PACKARD CO63 citations94
US6487382B2Nov 26, 2002
Techniques for achieving correct order in printer output
HEWLETT PACKARD CO18 citations93
US6397023B1May 28, 2002
Techniques for achieving correct order in printer output
HEWLETT PACKARD CO23 citations93
US6357848B1Mar 19, 2002
Apparatus and method for reducing edge margin tolerances in a printing device with one or more supplies of print media
HEWLETT PACKARD CO34 citations93
US5774154AJun 30, 1998
Apparatus for priming an ink delivery system in an ink-jet printer
HEWLETT PACKARD CO23 citations93
US6386692B1May 14, 2002
Ink container configured for use with compact supply station
HEWLETT PACKARD CO31 citations92
US6322065B1Nov 27, 2001
Hinged-arm pick mechanism
HEWLETT PACKARD CO31 citations92
US5844579ADec 1, 1998
Out-of-ink sensing system for an ink-jet printer
HEWLETT PACKARD CO29 citations92
US5844580ADec 1, 1998
Ink container configured for use with a printing device having an out-of-ink sensing system
HEWLETT PACKARD CO19 citations92
US6347856B1Feb 19, 2002
Test pattern implementation for ink-jet printhead alignment
HEWLETT PACKARD CO32 citations91
US6079807AJun 27, 2000
Print mode mapping for plain paper and transparency
HEWLETT PACKARD CO47 citations89
US6575545B2Jun 10, 2003
Impact reduction of slew decap by multi-dotting
HEWLETT PACKARD CO10 citations74
US6206594B1Mar 27, 2001
Print media level sensor and method for use in printing devices
HEWLETT PACKARD CO10 citations74
US6312116B2Nov 6, 2001
Ink cartridge having an integral pressurization apparatus
HEWLETT PACKARD CO14 citations73
US5326617AJul 5, 1994
Curl prevention using a transverse slit on tray-loaded film for printers
HEWLETT PACKARD CO3 citations61
US6345877B2Feb 12, 2002
Automated ink-jet printhead alignment system
HEWLETT PACKARD CO4 citations60
HEWLETT PACKARD DEVELOPMENT CO
10 patentsUS6866259B2Mar 15, 2005
Hinged-arm pick mechanism
HEWLETT PACKARD DEVELOPMENT CO18 citations92
US6637743B2Oct 28, 2003
Hinged-arm pick mechanism
HEWLETT PACKARD DEVELOPMENT CO16 citations92
US6793329B2Sep 21, 2004
Electrical and fluidic interface for an ink supply
HEWLETT PACKARD DEVELOPMENT CO16 citations84
US6659582B2Dec 9, 2003
Apparatus and method for fortification of black pigment based ink using black dye based ink
HEWLETT PACKARD DEVELOPMENT CO13 citations84
US7054034B2May 30, 2006
Printing apparatus and method for generating direction dependent color map
HEWLETT PACKARD DEVELOPMENT CO14 citations83
US6779864B2Aug 24, 2004
Apparatus and method for fortification of black pigment based ink using black dye based ink
HEWLETT PACKARD DEVELOPMENT CO6 citations74
US7014295B2Mar 21, 2006
System and method for producing efficient ink drop overlap filled with a pseudo hexagonal grid pattern
HEWLETT PACKARD DEVELOPMENT CO6 citations73
US6659589B2Dec 9, 2003
System and method for producing efficient ink drop overlap filled with a pseudo hexagonal grid pattern
HEWLETT PACKARD DEVELOPMENT CO6 citations73
US7225738B2Jun 5, 2007
Eye marks in image processing
HEWLETT PACKARD DEVELOPMENT CO3 citations52
US7543812B2Jun 9, 2009
Media registration devices
HEWLETT PACKARD DEVELOPMENT CO5 citations49