Patents by Inventor Markus R. Silvestri

Markus R. Silvestri has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6117967
    Abstract: Disclosed is a polymer of the formula ##STR1## wherein A is ##STR2## or a mixture of ##STR3## wherein R is a hydrogen atom, an alkyl group, an aryl group, or mixtures thereof, B is one of specified groups, such as ##STR4## or mixtures thereof, and n is an integer representing the number of repeating monomer units.
    Type: Grant
    Filed: June 4, 1999
    Date of Patent: September 12, 2000
    Assignee: Xerox Corporation
    Inventors: Timothy J. Fuller, John F. Yanus, Damodar M. Pai, Markus R. Silvestri, Ram S. Narang, William W. Limburg, Dale S. Renfer
  • Patent number: 6107439
    Abstract: A conductive composition including a mixture of a reaction product ofa hole transporting hydroxy functionalized aryl amine,a hydroxy functionalized arylamine that is different from the hole transporting hydroxy functionalized aryl amine,a cross linkable polyamide, andand an acid capable of simultaneously cross linking the polyamide and oxidizing a portion of the hydroxy functionalized arylamine,the mixture of a reaction product includinga hole transporting hydroxy functionalized aryl amine andan oxidized hydroxy functionalized aryl amine in aa crosslinked polyamide matrix.Other embodiments including processes for applying the aforementioned composition and processes for using devices containing the compositions in high speed laser printing and related printing systems are also disclosed.
    Type: Grant
    Filed: December 22, 1998
    Date of Patent: August 22, 2000
    Assignee: Xerox Corporation
    Inventors: John F. Yanus, Damodar M. Pai, Timothy J. Fuller, Paul J. DeFeo, Markus R. Silvestri, Dale S. Renfer, William W. Limburg
  • Patent number: 6103436
    Abstract: An electrophotographic imaging member including a supporting substrate coated with at least photoconductive layer, a charge transport layer and an overcoating layer, the overcoating layer includinga hydroxy functionalized aromatic diamine anda hydroxy functionalized triarylamine dissolved or molecularly dispersed ina crosslinked polyamide matrix, the crosslinked polyamide prior to crosslinking being selected from the group consisting of materials represented by the following Formulae I and II: ##STR1## wherein: n is a positive integer sufficient to achieve a weight average molecular weight between about 5000 and about 100,000,R is an alkylene unit containing from 1 to 10 carbon atoms,between 1 and 99 percent of the R.sub.2 sites are --H, andthe remainder of the R.sub.2 sites are --CH.sub.2 --O--CH.sub.3, and ##STR2## wherein: m is a positive integer sufficient to achieve a weight average molecular weight between about 5000 and about 100000,R.sub.
    Type: Grant
    Filed: October 29, 1998
    Date of Patent: August 15, 2000
    Assignee: Xerox Corporation
    Inventors: John F. Yanus, Damodar M. Pai, Timothy J. Fuller, Paul J. DeFeo, Anthony T. Ward, Dale S. Renfer, William W. Limburg, Markus R. Silvestri, Harold F. Hammond, Robert W. Nolley
  • Patent number: 6068960
    Abstract: A photoreceptor fabrication method including: (a) depositing a charge generating layer; (b) depositing a first charge transport layer having a first charge carrier mobility value; and (c) depositing a second charge transport layer having a second charge carrier mobility value that is different from the first charge carrier mobility value; wherein steps (a), (b), and (c) occur in any order, wherein the difference in the first charge carrier mobility value and the second charge carrier mobility value is accomplished by:(i) wherein the first charge transport layer includes a first binder and a first charge transport material and the second charge transport layer includes a second binder and a second charge transport material, selecting the first binder to have a lesser solubility limit for the first charge transport material than the solubility limit of the second binder for the second charge transport material; or(ii) wherein the first transport layer includes a first polymeric compound composed of a first char
    Type: Grant
    Filed: September 14, 1998
    Date of Patent: May 30, 2000
    Assignee: Xerox Corporation
    Inventors: Damodar M. Pai, Chu-Heng Liu, John F. Yanus, Timothy J. Fuller, Markus R. Silvestri
  • Patent number: 6025102
    Abstract: A flexible electrophotographic imaging member including a supporting substrate coated with at least one imaging layer comprising charge transport material free of long chain alkyl carboxylate groups and a small amount of a different second hole transporting material containing at least two long chain alkyl carboxylate groups dissolved or molecularly dispersed in a film forming binder and coated from a mixture of solvents containing low boiling component and a small concentration of high boiling solvent.
    Type: Grant
    Filed: August 19, 1997
    Date of Patent: February 15, 2000
    Assignee: Xerox Corporation
    Inventors: Damodar M. Pai, John F. Yanus, Timothy J. Fuller, Merlin E. Scharfe, Paul J. DeFeo, Markus R. Silvestri
  • Patent number: 6020096
    Abstract: An electrophotographic imaging member comprising a charge generating layer comprising trigonal selenium particles and a charge transport layer, the charge transport layer includinga protonic acid or Lewis acid,a charge transporting small molecule,a film forming polymer, andpolyalkylene-block-polyethylene oxide.This imaging member may be fabricated using a suitable solvent for applying the charge transport layer.
    Type: Grant
    Filed: October 28, 1998
    Date of Patent: February 1, 2000
    Assignee: Xerox Corporation
    Inventors: Timothy J. Fuller, Markus R. Silvestri, Damodar M. Pai, John F. Yanus, Raymond K. Crandall, Samuel Kaplan, Karen S. Garland
  • Patent number: 5985500
    Abstract: A photoreceptor composed of: (a) a substrate; (b) a blocking layer including a fluoroelastomer; (c) a charge generating layer including a binder material and a phthalocyanine; and (d) a charge transport layer.
    Type: Grant
    Filed: August 13, 1998
    Date of Patent: November 16, 1999
    Assignee: Xerox Corporation
    Inventors: Timothy J. Fuller, Markus R. Silvestri, Damodar M. Pai, John F. Yanus, Huoy-Jen Yuh, John S. Chambers, Ihor W. Tarnawskyj, Kock-Yee Law
  • Patent number: 5976744
    Abstract: An electrophotographic imaging member includinga supporting substrate coated withat least one photoconductive layer, andan overcoating layer, the overcoating layer including aa hydroxy functionalized aromatic diamine anda hydroxy functionalized triarylamine dissolved or molecularly dispersed ina crosslinked acrylated polyamide matrix, the hydroxy functionalized triarylamine being a compound different from the polyhydroxy functionalized aromatic diamine, the crosslinked polyamide prior to crosslinking being selected from the group consisting of materials represented by the following Formulae I and II: ##STR1## wherein: n is a positive integer sufficient to achieve a weight average molecular weight between about 5000 and about 100,000,R is an alkylene group containing from 1 to 10 carbon atoms,between 1 and 99 percent of the R.sub.2 sites are ##STR2## wherein X is selected from the group consisting of --H (acrylate), --CH.sub.3 (methacrylate), alkyl and aryl, andthe remainder of the R.sub.
    Type: Grant
    Filed: October 29, 1998
    Date of Patent: November 2, 1999
    Assignee: Xerox Corporation
    Inventors: Timothy J. Fuller, John F. Yanus, Damodar M. Pai, William W. Limburg, Markus R. Silvestri, Dale S. Renfer, Anthony T. Ward, Paul J. DeFeo, Harold F. Hammond, Robert W. Nolley
  • Patent number: 5976418
    Abstract: A conductive polymer composition selected from the group consisting ofa first composition includinga polymer containing halomethylated aromatic groups, anda charge transporting material selected from the group consisting ofat least one charge transport monomer containing arylamine groups,at least one charge transport polymer containing arylamine units in the main polymer chain,and mixtures thereof, anda second composition includingat least one monomer containing a halomethylated aromatic group,at least one charge transport monomer containing arylamine groups anda polymer binder, anda third composition including:at least one monomer containing a halomethylated aromatic group, andat least one charge transport polymer with arylamine units in the main polymer chain.The aforementioned compositions may be applied as coatings and used in high speed laser printing and related printing processes.
    Type: Grant
    Filed: November 5, 1998
    Date of Patent: November 2, 1999
    Assignee: Xerox Corporation
    Inventors: Timothy J. Fuller, Damodar M. Pai, John F. Yanus, Paul J. DeFeo, Markus R. Silvestri, Ram S. Narang, William W. Limburg, Dale S. Renfer, Milan Stolka, Martin A. Abkowitz, Ralph A. Mosher
  • Patent number: 5882831
    Abstract: An electrophotographic imaging member comprising a charge generating layer comprising trigonal selenium particles and a charge transport layer, the charge transport layer includinga protonic acid or Lewis acida charge transporting small molecule,a film forming polymer, andan additive selected from the group consisting of1-alkylpiperidene,triethylamine,a complex of 1-alkylpiperidene and a protonic acid or Lewis acid,a complex of triethylamine and a protonic acid or Lewis acid and mixtures thereof.This imaging member may be fabricated using a solvent for applying the charge transport layer.
    Type: Grant
    Filed: October 28, 1998
    Date of Patent: March 16, 1999
    Assignee: Xerox Corporation
    Inventors: Timothy J. Fuller, Damodar M. Pai, Markus R. Silvestri, John F. Yanus, Timothy L. Lincoln, David J. Maty, Kathleen M. Carmichael