Inventor

DONALDSON PATRICIA J

US49 patents

⚠️ This page may combine multiple inventors who share the name “DONALDSON PATRICIA J”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

DONALDSON PATRICIA J

XEROX CORP

System and method for analysis of low-contrast ink test patterns in inkjet printers

Real-time control of tone reproduction curve by redefinition of lookup tables from fit of in-line enhanced toner area coverage (ETAC) data

Tone reproduction curve systems and methods

Toner concentration control for an imaging system

Toner age calculation in print engine diagnostic

Apparatus and method for controlling development of developer material on a photoreceptive member

System and method for operating a three-dimensional printer to compensate for radial velocity variations

System and method for reducing or eliminating hue shift in three-dimensional printed objects

Coordination of printhead/substrate position with transfer of marking material

System and method for identification of marks in printed test patterns

Feedback toner concentration control for an imaging system

Feed forward and feedback toner concentration control for an imaging system

System and method for test pattern formation during three-dimensional object printing

System for controlling operation of a printer during three-dimensional object printing with reference to a distance from the surface of object

Digital manufacturing system for printing three-dimensional objects on a rotating core

Digital manufacturing system for printing three-dimensional objects on a rotating surface

Method and system for calibrating a reflection infrared densitometer in a digital image reproduction machine

Feedback toner concentration control for an imaging system

Feed forward and feedback toner concentration control for an imaging system

Dark decay control system utilizing two electrostatic voltmeters

System and method for operating a three-dimensional printer to compensate for radial velocity variations

System and method of printhead calibration with reduced number of active inkjets

Chemical delivery devices produced using halftone screening in an additive manufacturing process

Dot clock signal generation for operating ejectors in multiple color stations in a substrate printer

Systems and methods for in situ setting charge voltages in a dual recharge system

Multi-roll developer housing with converging belt to roll spacing

Tone reproduction curve linearization

Magenta toner and imaging processes

Imaging processes using cyan and black toners

Lead edge offset correction for intermediate transfer drum imaging

System and method for protection of printed images formed on surfaces of three-dimensional printed objects

System and method for additive manufacture of chemical delivery devices using halftone screening

System and method for protection of printed images formed on surfaces of three-dimensional printed objects

System and method for analysis of compact printed test patterns

System for detecting inoperative inkjets in printheads ejecting clear ink using thermal substrates

System for detecting inoperative inkjets in printheads ejecting clear ink using thermal substrates

System for detecting inoperative inkjets in printheads ejecting clear ink using thermal substrates

System for detecting inoperative inkjets in printheads ejecting clear ink using thermal substrates

In situ calibration of multiple printheads to reference ink targets

Printed products having machine-readable code for creating secure links

System and method for controlling the lower power bound for a raster output scanner in a color xerographic printer

Dual encoder system to minimize reflex printing variation

Reproduction machine having image deletions reducing control system and method

CALAMITA JAMES P

Method and system for correcting media shift during identification of printhead roll

VITURRO R ENRIQUE

In situ calibration of multiple printheads to reference ink targets

SHIN HELEN HAEKYUNG

System and method for sub-pixel ink drop adjustment for process direction registration

DONALDSON PATRICIA J

Method of printhead calibration between multiple printheads

MO SONG-FENG

System and method for controlling consistent color quality

MESTHA LALIT K

Systems and methods for printing images outside a normal color gamut in image forming devices