David M Wilcox

US Patent:

6671479, Dec 30, 2003

Filed:

May 28, 2002

Appl. No.:

10/063940

Inventors:

Heidi M. Grenek - Fairport NY
Naveen G. Sharma - Perinton NY
David G. Wilcox - Dundee NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G03G 1500

US Classification:

399223, 399231

Abstract:

The selective depopulation and/or repopulation of a full color image-next-to-image or image-on-image print engine for generating monochrome and/or highlight color images, utilizing a multiplicity of functionally-equivalent substations in tandem to compensate for the increase in printing speed.

US Patent:

43266460, Apr 27, 1982

Filed:

May 11, 1979

Appl. No.:

6/038371

Inventors:

Lawrence P. Lavery - Fairport NY
David G. Wilcox - Macedon NY
Dale C. Thomas - Ontario NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

B67D 508

US Classification:

222 56

Abstract:

An automatic development control system having a sensor providing a signal representative of developed toner mass on a patch sample on the photoreceptor. The signal is conveyed to a comparator through signal processing circuits for comparing with a reference signal. The signal processing circuits include digital to analog circuitry also capable of providing analog to digital conversion. The reference signal represents an undeveloped photoreceptor signal normalized to accommodate changing photoreceptor, sensor and operating environment characteristics. A dispenser solenoid activates a toner dispenser through an interrupt mechanism in given increments of time depending upon the error signals generated by the comparator.

US Patent:

50919717, Feb 25, 1992

Filed:

Feb 28, 1990

Appl. No.:

7/590126

Inventors:

Joseph W. Ward - Pittsford NY
Kenneth Wang - La Palma CA
Joel Lissade - Henrietta NY
Paula Siviy - Webster NY
David G. Wilcox - Macedon NY
Agatha Yang - Hawthorne CA

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G06K 940

US Classification:

382 54

Abstract:

A method and apparatus for modifying an image data signal has a serial channel for obtaining a desired number of current M-bit patterns from the image data. Unique bit patterns are recognized in the current bit patterns, and new bit patterns are generated, each being specific to the detected unique bit pattern. The current and new bit patterns are combined in a predetermined manner to modify the image data as desired. For example, if the unique bit patterns are recognized as dark images on a leading edge of an image, the new bit patterns are generated and combined with the current bit patterns to lighten the image, particularly at the leading edge to improve stripping of the print media on which the image is printed from a fuser roll of the printer.

US Patent:

52367959, Aug 17, 1993

Filed:

Sep 5, 1991

Appl. No.:

7/755197

Inventors:

Robin E. Berman - Rochester NY
Mark A. Scheuer - Williamson NY
Daniel W. MacDonald - Farmington NY
Carl B. Hurwitch - Rochester NY
David G. Wilcox - Macedon NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

B03G 2100

US Classification:

430 30

Abstract:

Infra-Red Densitometer (IRD) readings are utilized to check the efficiency of two-pass cleaning of the black toner patch in a tri-level imaging apparatus. The IRD examines the background patch of the tri-level image and declares a machine fault if excessive toner is detected.

US Patent:

51327309, Jul 21, 1992

Filed:

Sep 5, 1991

Appl. No.:

7/755206

Inventors:

Carl B. Hurwitch - Rochester NY
Mark A. Scheuer - Williamson NY
Robin E. Berman - Rochester NY
Daniel W. MacDonald - Farmington NY
David G. Wilcox - Macedon NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G03G 2100

US Classification:

355206

Abstract:

In a single pass, tri-level imaging apparatus, machine cycle down is initiated when the color developer housing is functioning improperly. The voltage level of the color image prior to its development is read using an electrostatic voltmeter (ESV). The voltage level thereof is also read after development. The difference between these two readings is compared to an arbitrary target value and a machine cycle down is initiated if the difference is greater than the target.