Inventor
HIRST B MARK
US32 patents
⚠️ This page may combine multiple inventors who share the name “HIRST B MARK”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HEWLETT PACKARD CO
21 patentsUS5491540AFeb 13, 1996
Replacement part with integral memory for usage and calibration data
HEWLETT PACKARD CO196 citations99
US5930553AJul 27, 1999
Image forming and office automation device consumable with memory
HEWLETT PACKARD CO232 citations98
US5835817ANov 10, 1998
Replaceable part with integral memory for usage, calibration and other data
HEWLETT PACKARD CO425 citations98
US5789723AAug 4, 1998
Reduced flicker fusing system for use in electrophotographic printers and copiers
HEWLETT PACKARD CO108 citations98
US5699091ADec 16, 1997
Replaceable part with integral memory for usage, calibration and other data
HEWLETT PACKARD CO433 citations98
US6563726B1May 13, 2003
Synchronous bridge rectifier
HEWLETT PACKARD CO41 citations92
US6445902B1Sep 3, 2002
Simplified fusing system
HEWLETT PACKARD CO44 citations92
US6396724B1May 28, 2002
Charge-pumped DC bias supply
HEWLETT PACKARD CO20 citations92
US6339211B1Jan 15, 2002
Reducing a temperature differential in a fixing device
HEWLETT PACKARD CO32 citations92
US6294904B1Sep 25, 2001
Multiple frequency switching power supply and methods to operate a switching power supply
HEWLETT PACKARD CO43 citations92
US6127816AOct 3, 2000
Multiple frequency switching power supply and methods to operate a switching power supply
HEWLETT PACKARD CO36 citations92
US6018151AJan 25, 2000
Predictive fusing system for use in electrophotographic printers and copiers
HEWLETT PACKARD CO21 citations92
US6014161AJan 11, 2000
Closed loop compensation for gray scale printing devices
HEWLETT PACKARD CO28 citations92
US5925278AJul 20, 1999
Universal power supply for multiple loads
HEWLETT PACKARD CO40 citations92
US5811764ASep 22, 1998
Method for reducing flicker in electrophotographic printers and copiers
HEWLETT PACKARD CO24 citations92
US5627722AMay 6, 1997
Single high voltage supply for use in a multiple developer electrophotographic printer
HEWLETT PACKARD CO24 citations92
US6181895B1Jan 30, 2001
Image forming devices, image forming methods, and methods of supplying power to an image forming device
HEWLETT PACKARD CO16 citations84
US6122478ASep 19, 2000
Reduction of thermally induced mechanical stress in a fixing device
HEWLETT PACKARD CO16 citations84
US5541458AJul 30, 1996
Power supply for timed residual power after turn off
HEWLETT PACKARD CO11 citations74
US6512913B2Jan 28, 2003
Fusing system including a heat storage mechanism
HEWLETT PACKARD CO9 citations73
US6307584B1Oct 23, 2001
Single polygon scanner for multiple laser printer
HEWLETT PACKARD CO10 citations73
HEWLETT PACKARD DEVELOPMENT CO
9 patentsUS6580895B2Jun 17, 2003
Fusing system including a heat distribution mechanism
HEWLETT PACKARD DEVELOPMENT CO28 citations92
US7541692B2Jun 2, 2009
Peripheral device having a power supply
HEWLETT PACKARD DEVELOPMENT CO18 citations82
US6847016B2Jan 25, 2005
System and method for controlling power in an imaging device
HEWLETT PACKARD DEVELOPMENT CO7 citations74
US6710309B1Mar 23, 2004
Use of the temperature gradient to determine the source voltage
HEWLETT PACKARD DEVELOPMENT CO9 citations74
US6635864B2Oct 21, 2003
Measurement and correction of a scan line length error
HEWLETT PACKARD DEVELOPMENT CO7 citations74
US7187398B2Mar 6, 2007
Characterization of a scan line produced from a facet of a scanning device
HEWLETT PACKARD DEVELOPMENT CO7 citations73
US6853831B2Feb 8, 2005
Fusing system including an external heater
HEWLETT PACKARD DEVELOPMENT CO9 citations73
US6721530B2Apr 13, 2004
Fusing system having electromagnetic heating
HEWLETT PACKARD DEVELOPMENT CO10 citations73
US7180534B2Feb 20, 2007
Scanning assemblies, printing devices, and related methods
HEWLETT PACKARD DEVELOPMENT CO0 citations52