Surendar C Jeyadev

US Patent:

7251419, Jul 31, 2007

Filed:

Jun 22, 2005

Appl. No.:

11/158820

Inventors:

Markus R. Silvestri - Fairport NY, US
Surendar Jeyadev - Rochester NY, US
Gary A. Batt - Fairport NY, US
Dale S. Renfer - Webster NY, US

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G03G 15/00
G03G 21/00

US Classification:

399 26, 399 49

Abstract:

A method for determining the approximate surface conductivity of a photoreceptor surface. The method involves forming a latent image of a series of lines of different widths on the surface, developing the image, and then printing the image. Based on which lines print, the surface conductivity can be computed once the developability of isolated lines is established through a calibration procedure.

US Patent:

7271593, Sep 18, 2007

Filed:

Oct 11, 2005

Appl. No.:

11/247576

Inventors:

Johann E. Junginger - Toronto, CA
Zoran D. Popovic - Mississauga, CA
Surendar Jeyadev - Rochester NY, US

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G01N 27/60
G01R 29/12

US Classification:

324456, 324457

Abstract:

A method for detecting charge defect spots (CDSs) on a chargeable surface is provided, including charging the chargeable surface to receive and hold a first voltage charge, spacing a surface of a scanner probe a distance from the chargeable surface, the scanner probe having a diameter, and biasing the scanner probe to a second voltage charge within a predetermined voltage threshold of the first voltage charge, wherein a parallel plate capacitor is established with the chargeable surface and a dielectric substance between the scanner probe and the chargeable surface. The method further includes reading with the scanner probe potentials associated with charges induced from the applied charges and any CDSs on the chargeable surface, including sensing the potentials and generating a signal corresponding to the sensing, applying a reference charge to the chargeable surface, and determining the potential of a CDS on the chargeable surface based on the scanner probe readings and at least one of the applied charges, which includes correcting for non-uniform charge distribution caused by a point-like nature of the CDS on the chargeable surface.

US Patent:

7298983, Nov 20, 2007

Filed:

Dec 7, 2004

Appl. No.:

11/005980

Inventors:

Markus Rudolf Silvestri - Fairport NY, US
Surendar Jeyadev - Rochester NY, US
Satchidanand Mishra - Webster NY, US
M. John Hinckel - Rochester NY, US
Edward Domm - Hilton NY, US
James M. Markovics - Rochester NY, US

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G03G 15/00

US Classification:

399 48, 399159

Abstract:

The amount of lateral charge migration (LCM) on a photoreceptor is quantified by measuring the average potential of a latent image formed on the photoreceptor surface. The surface is first uniformly charged, then exposed a first time to an image. After a waiting period during which LCM may occur, the surface is exposed a second time to the image. After another waiting period, the average potential is measured. The amount of LCM may be quantified by varying the waiting periods.

US Patent:

8611769, Dec 17, 2013

Filed:

Nov 22, 2011

Appl. No.:

13/302332

Inventors:

Aaron Michael Burry - Ontario NY, US
Surendar Jeyadev - Rochester NY, US
Palghat S. Ramesh - Pittsford NY, US
Eric Scott Hamby - Webster NY, US
Vladimir Kozitsky - Rochester NY, US
Gary Walker Skinner - Rochester NY, US

Assignee:

Xerox Corporation - Norwalk CT

International Classification:

G03G 5/00

US Classification:

399 31, 399 48, 399 50, 399128

Abstract:

This disclosure provides methods and systems for troubleshooting charging and photoreceptor failure modes associated with a xerographic process. Specifically, according to an exemplary method the photoreceptor decay behavior, with and without the effects of depletion, are quantified and used to determine a performance state of one or more of the charging stations and the photoreceptor surface.

US Patent:

20060090840, May 4, 2006

Filed:

Mar 21, 2005

Appl. No.:

11/085414

Inventors:

Satchidanand Mishra - Webster NY, US
Robert Yu - Webster NY, US
Surendar Jeyadev - Rochester NY, US

International Classification:

B32B 37/00

US Classification:

156217000, 156256000, 156304500

Abstract:

A method of fabricating an endless flexible belt having a circumference Land a thin seam profile. The method includes (a) cutting a work sheet of flexible belt material from a web of such material so that the work sheet has a first end and a first end region, a second end and a second end region, and a length Lthat is D units greater than L; (b) looping the work sheet and overlapping the first end region and the second end region thereof by D units to form an overlapping dual end region; (c) making a single slice through the overlapping dual end region to produce a first, male side and a second, female side of the slice, and to produce a belt-length sheet, the first, male side of the slice comprising a first, male end of the belt-length sheet, and the second, female side of the slice comprising a second, female end of the belt-length sheet; (d) looping the belt-length sheet, re-aligning and mating the first, male side and the second, female side of the single slice to form a no-discrepancy abutment; and (e) heating and fusing the no-discrepancy abutment to form an endless flexible belt having a thin profile seam including no undesirable thickness variations and no undesirable protrusions.

US Patent:

61839213, Feb 6, 2001

Filed:

Dec 6, 1996

Appl. No.:

8/787057

Inventors:

William W. Limburg - Penfield NY
Merlin E. Scharfe - Penfield NY
David H. Pan - Rochester NY
Dale S. Renfer - Webster NY
Richard L. Schank - Pittsford NY
Surendar Jeyadev - Rochester NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G03G 5047

US Classification:

430 587

Abstract:

A crack resistant, curl-free electrophotographic imaging member includes a charge transport layer comprising an active charge transporting polymeric tetraaryl-substituted biphenyidiamine and a plasticizer.

US Patent:

60759593, Jun 13, 2000

Filed:

Dec 18, 1998

Appl. No.:

9/216053

Inventors:

Surendar Jeyadev - Rochester NY
Merlin E. Scharfe - Penfield NY
James M. Markovics - Rochester NY
Damodar M. Pai - Fairport NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G03G 1500

US Classification:

399127

Abstract:

An electrophotographic printing machine has a photoreceptive member. The photoreceptive member is charged and then exposed with a light image representation to form a latent image. An electric field, less than that required to re-charge the photoreceptive member, is applied to the latent image to increase the rate of discharge of the exposed portions of the latent image. The latent image is then developed.

US Patent:

20150147075, May 28, 2015

Filed:

Nov 26, 2013

Appl. No.:

14/091096

Inventors:

- Norwalk CT, US
Edward A. Domm - Hilton NY, US
Mario Errico - Rochester NY, US
Charles Hubert Henry Howes - Marion NY, US
Martin John Hinckel - Rochester NY, US
Surendar Jeyadev - Rochester NY, US
Nancy L. Belknap - Rochester NY, US

Assignee:

Xerox Corporation - Norwalk CT

International Classification:

G03G 15/00

US Classification:

399 26

Abstract:

Described herein is a device that generates a beam of light with uniform intensity. The device includes an array of light sources. The light generated passes through a beam splitter. One beam is used for feedback to maintain uniform intensity. The other beam passes through a barrel which is used to mold the beam with uniform intensity into the desired shape and to reduce divergence. The device can be used as part of a quality control system for testing a photoreceptor drum.