Patents by Inventor Rachael L. McGrath
Rachael L. McGrath 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).
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Publication number: 20130293616Abstract: An image transfer system for use in an indirect printer includes a support roller for a transfix roller. The support roller is configured to apply pressure to a center portion of a nip formed between a transfix roller and an imaging drum while the transfix roller applies pressure to the ends of the nip. This configuration is particularly advantageous for use with imaging drums and transfix rollers having thin walls.Type: ApplicationFiled: May 4, 2012Publication date: November 7, 2013Applicant: Xerox CorporationInventors: Bruce E. Thayer, Bin Zhang, Palghat S. Ramesh, Rachael L. McGrath, Christopher A. DiRubio
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Publication number: 20120039648Abstract: Various embodiments provide low adhesion coatings that can be used for an image-side member in an image fixing system of an electrophotographic printer or an ink jet printer, wherein the low adhesion coatings can exhibit a low sliding angle ranging from about 1° to about 30° with a solid ink, a toner, hexadecane and/or water.Type: ApplicationFiled: August 12, 2010Publication date: February 16, 2012Applicant: XEROX CORPORATIONInventors: Varun Sambhy, Dale R. Mashtare, Kock-Yee Law, Rachael L. McGrath
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Publication number: 20120008996Abstract: A system to combine the transfer and fixing xerographic steps of a xerographic printer into one, as well as to eliminate the need for an electrical field for transfer. The image is transfixed directly from a photoconductor to the paper or other suitable substrate. Appropriate pressure is applied during this step to cold-pressure fix the toner on the paper, taking into account the type of substrate and type of toner. The cold pressure transfix can be done either directly from a photoreceptor, without an intermediate transfer belt (ITB), eliminating all electrostatic transfer subsystems and a fusing operation. Alternatively, for engines with an intermediate transfer belt (ITB), the cold pressure transfix could replace a needed second transfer and fuser system.Type: ApplicationFiled: July 7, 2010Publication date: January 12, 2012Applicant: XEROX CORPORATIONInventors: George C. Cardoso, John F. Knapp, Rachael L. McGrath, Dale R. Mashtare
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Patent number: 7537410Abstract: A driven coupling includes three separate cam lobes projecting therefrom that mate with mating female features in a driver coupling. A central straight or tapered bore accepts a conical alignment pin that projects from the driver coupling. Since the cam lobes are independent and are able to radically deflect, under torque load the central bore is closed down to create a highly precise alignment.Type: GrantFiled: October 31, 2006Date of Patent: May 26, 2009Assignee: Xerox CorporationInventors: Michael A. Parisi, Robert S. Karz, Richard W. Seyfried, Shu Chang, John G. Shaw, Rachael L. McGrath, Jacqueline Y. Tyson
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Patent number: 7532830Abstract: A development station that improves toner halftone dot development over a wide range of environmental conditions includes a developer housing for retaining semi-conductive carrier particles and toner particles, a first magnetic roll having a stationary core with at least one magnet and a sleeve having longitudinal grooves that rotates about the stationary core of the first magnetic roll, a second magnetic roll having a stationary core with at least one magnet and a sleeve having longitudinal grooves that rotates about the stationary core of the second magnetic roll, an environmental sensor for generating an environmental condition signal, a variable voltage supply coupled to the first magnetic roll and the second magnetic roll, and a control circuit for adjusting an output level for the variable voltage supply.Type: GrantFiled: July 31, 2006Date of Patent: May 12, 2009Assignee: Xerox CorporationInventors: Ajay Kumar, Hirotsugu Oba, Keith Allan Nau, David Antwone Reed, Cory Joseph Winters, Michael Donald Thompson, Allen T. Retzlaff, Jennifer Rea Wagner, Paul W. Morehouse, Jr., Rasin Moser, Song Feng Mo, Rachael L. McGrath, John Franklyn Knapp
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Method for charging a photoreceptor to extend the life of a charge receptor in a xerographic printer
Patent number: 7447461Abstract: A method of operating an electrostatographic printing apparatus, the apparatus including a charge-retentive member defining an imaging surface and a charging device for placing a charge on the imaging surface, including the steps of: providing a power supply to apply a bias to the bias charging roll; and applying a bias to the bias charging roll, the applying includes applying a burst modulated waveform to the bias charging roll.Type: GrantFiled: February 21, 2006Date of Patent: November 4, 2008Assignee: Xerox CorporationInventors: John S. Facci, Rachael L. McGrath -
Publication number: 20080101858Abstract: A driven coupling includes three separate cam lobes projecting therefrom that mate with mating female features in a driver coupling. A central straight or tapered bore accepts a conical alignment pin that projects from the driver coupling. Since the cam lobes are independent and are able to radically deflect, under torque load the central bore is closed down to create a highly precise alignment.Type: ApplicationFiled: October 31, 2006Publication date: May 1, 2008Inventors: Michael A. Parisi, Robert S. Karz, Richard W. Seyfried, Shu Chang, John G. Shaw, Rachael L. McGrath, Jacqueline Y. Tyson
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Publication number: 20080025739Abstract: A development station in an electrostatographic imaging machine may be controlled to improve toner halftone dot development over a wide range of environmental conditions.Type: ApplicationFiled: July 31, 2006Publication date: January 31, 2008Applicant: Xerox CorporationInventors: Ajay Kumar, Hirotsugu Oba, Keith Allan Nau, David Antwone Reed, Cory Joseph Winters, Michael Donald Thompson, Allen T. Retzlaff, Jennifer Rea Wagner, Paul W. Morehouse, Rasin Moser, Song Feng Mo, Rachael L. McGrath, John Franklyn Knapp
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Patent number: 7110701Abstract: In a xerographic printing apparatus, a scorotron places a uniform charge on a photoreceptor for forming electrostatic latent images. Two conductive pin arrays are disposed in a housing defined by sidewalls and a grid adjacent the photoreceptor. For each array, the distance to the adjacent sidewall is 1.0 to 1.5 the distance to the grid.Type: GrantFiled: July 14, 2004Date of Patent: September 19, 2006Assignee: Xerox CorporationInventors: John S. Facci, Ajay Kumar, Rachael L. McGrath, Michael E. Zona, Kenneth W. Pietrowski
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Patent number: 7072599Abstract: An electrostatographic printing apparatus comprises a charge receptor, and a transfer station for transferring a toner image from the charge receptor to a sheet by providing an electric field of predetermined magnitude at a transfer zone. The transfer station includes a rotatable transfer member, with a cleaning corotron associated therewith. A control system for maintaining a constant current at the transfer zone takes into account a current supplied by the cleaning corotron. The control system can also take into account current leakages associated with the transfer member.Type: GrantFiled: November 15, 2004Date of Patent: July 4, 2006Assignee: Xerox CorporationInventors: Christopher A. DiRubio, Gerald M. Fletcher, Michael F. Zona, Rachael L. McGrath, Bruce E. Thayer
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Method for charging a photoreceptor to extend the life of a charge receptor in a xerographic printer
Patent number: 7054574Abstract: A method of operating an electrostatographic printing apparatus, the apparatus including a charge-retentive member defining an imaging surface and a charging device for placing a charge on the imaging surface, including the steps of: providing a power supply to apply a bias to the bias charging roll; and applying a bias to the bias charging roll, the applying includes applying a burst modulated waveform to the bias charging roll.Type: GrantFiled: November 25, 2003Date of Patent: May 30, 2006Assignee: Xerox CorporationInventors: John S. Facci, Rachael L. McGrath -
Patent number: 6913721Abstract: Apparatus for charging a substrate, including: an elongated charging member having a crowned surface; an elongated pressure member having the pressure member being supported for pressure engagement with the charging member to form a nip therebetween adapted to receive the substrate. There is also disclosed a method for making the apparatus.Type: GrantFiled: August 27, 2002Date of Patent: July 5, 2005Assignee: Xerox CorporationInventors: Michael F. Zona, John S. Facci, Michael J. Levy, Rachael L. McGrath
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Patent number: 6807389Abstract: An apparatus and process for applying an electrical charge to a photoreceptor wherein a bias charge roll member is situated in contact or in close proximity with a surface of a member to be charged such as a photoreceptor. The bias charge roll member is supplied with an electrical bias having a variable voltage waveform onto which a DC bias is superimposed. The amount of DC bias is selected to set the signal voltage such that a minimally acceptable amount of AC corona is created sufficient for uniform photoreceptor charging while avoiding unnecessary excessive positive corona that causes excessive photoreceptor wear.Type: GrantFiled: December 13, 2002Date of Patent: October 19, 2004Assignee: Xerox CorporationInventors: John S. Facci, Michael J. Levy, Paul W. Morehouse, Jr., Rachael L. McGrath
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Publication number: 20040114956Abstract: An apparatus and process for applying an electrical charge to a photoreceptor wherein a bias charge roll member is situated in contact or in close proximity with a surface of a member to be charged such as a photoreceptor. The bias charge roll member is supplied with an electrical bias having a variable voltage waveform onto which a DC bias is superimposed. The amount of DC bias is selected to set the signal voltage such that a minimally acceptable amount of AC corona is created sufficient for uniform photoreceptor charging while avoiding unnecessary excessive positive corona that causes excessive photoreceptor wear.Type: ApplicationFiled: December 13, 2002Publication date: June 17, 2004Applicant: Xerox CorporationInventors: John S. Facci, Michael J. Levy, Paul W. Morehouse, Rachael L. McGrath
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Publication number: 20040041293Abstract: Apparatus for charging a substrate, comprising: an elongated charging member having a crowned surface; an elongated pressure member having, the pressure member being supported for pressure engagement with the charging member to form a nip therebetween adapted to receive the substrate. There is also disclose a method for making the apparatus.Type: ApplicationFiled: August 27, 2002Publication date: March 4, 2004Applicant: Xerox CorporationInventors: Michael F. Zona, John S. Facci, Michael J. Levy, Rachael L. McGrath
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Patent number: 6684043Abstract: Apparatus for charging a substrate, comprising: an elongated charging member having a crowned surface; an elongated pressure member having, the pressure member being supported for pressure engagement with the charging member to form a nip therebetween adapted to receive the substrate. There is also disclose a method for making the apparatus.Type: GrantFiled: August 27, 2002Date of Patent: January 27, 2004Assignee: Xerox CorporationInventors: Michael F. Zona, John S. Facci, Michael J. Levy, Rachael L. McGrath
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Patent number: 5888285Abstract: Disclosed is an ink composition which comprises water, a colorant, a bisquaternary ammonium compound, and a material of the formula ?(F.sub.3 C(F.sub.2 C).sub.n CH.dbd.CHCH.sub.2 OCH(OH)CH.sub.2).sub.2 NCH.sub.2 COO.sup.- !?X.sup.+ !, wherein X is a cation and n is an integer of from about 3 to about 20. Also disclosed are ink jet printing processes employing the aforementioned ink.Type: GrantFiled: October 30, 1997Date of Patent: March 30, 1999Assignee: Xerox CorporationInventors: Kurt B. Gundlach, Luis A. Sanchez, Rachael L. McGrath, Richard L. Colt
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Patent number: 5855656Abstract: Disclosed is an ink composition which comprises (a) water, (b) a colorant, and (c) a material of the formula ?(F.sub.3 C(F.sub.2 C).sub.n CH.dbd.CHCH.sub.2 OCH(OH)CH.sub.2).sub.2 NCH.sub.2 COO.sup.- !?X.sup.+ !, wherein X is a cation and n is an integer of from about 3 to about 20. Also disclosed are processes for preparing the ink composition and ink jet printing processes with the ink composition.Type: GrantFiled: October 30, 1997Date of Patent: January 5, 1999Assignee: Xerox CorporationInventors: Kurt B. Gundlach, Luis A. Sanchez, Cheryl A. Hanzlik, Kathy-Jo Brodsky, Richard L. Colt, Aileen M. Montes, Rachael L. McGrath, Danielle Avolio