Inventor
WALKER RAY A
US17 patents
⚠️ This page may combine multiple inventors who share the name “WALKER RAY A”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HEWLETT PACKARD CO
6 patentsUS6312074B1Nov 6, 2001
Method and apparatus for detecting fluid level in a fluid container
HEWLETT PACKARD CO145 citations98
US6312106B1Nov 6, 2001
Method and apparatus for transferring information between a replaceable consumable and a printing device
HEWLETT PACKARD CO200 citations98
US6302527B1Oct 16, 2001
Method and apparatus for transferring information between a printer portion and a replaceable printing component
HEWLETT PACKARD CO153 citations98
US6494562B1Dec 17, 2002
Method and apparatus for identifying a sales channel
HEWLETT PACKARD CO28 citations96
US6345891B1Feb 12, 2002
Method and apparatus for specifying ink volume in a multichamber ink container
HEWLETT PACKARD CO31 citations92
US6431672B1Aug 13, 2002
Ink container having dual capillary members with differing capillary pressures for precise ink level sensing
HEWLETT PACKARD CO14 citations83
HEWLETT PACKARD DEVELOPMENT CO
6 patentsUS6648434B2Nov 18, 2003
Digitally compensated pressure ink level sense system and method
HEWLETT PACKARD DEVELOPMENT CO58 citations96
US6863377B2Mar 8, 2005
Method and apparatus for identifying a sales channel
HEWLETT PACKARD DEVELOPMENT CO17 citations92
US6676240B2Jan 13, 2004
Method and apparatus for transferring information between a replaceable consumable and a printing device
HEWLETT PACKARD DEVELOPMENT CO14 citations84
US6739691B2May 25, 2004
Method and apparatus for preventing theft of replaceable printing components
HEWLETT PACKARD DEVELOPMENT CO7 citations73
US6685298B2Feb 3, 2004
Method and apparatus for preventing theft of replaceable printing components
HEWLETT PACKARD DEVELOPMENT CO5 citations73
US7110127B2Sep 19, 2006
Method and apparatus for product regionalization
HEWLETT PACKARD DEVELOPMENT CO3 citations53