Patents by Inventor Leonard M. Carreira
Leonard M. Carreira 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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Patent number: 6881250Abstract: The present invention relates to an ink composition including water, a solvent, a solvent-soluble dye, and a surfactant, where the ink exhibits a stable liquid microemulsion phase at a first temperature and a second temperature higher than the first temperature and has a conductivity of at most about 200 ?S/cm and a dielectric constant of at least about 60, and methods of making such ink compositions. The present invention also relates to a method of making an ink composition for use in a microelectromechanical system-based fluid ejector. The method involves providing a solution or dispersion including a dye or a pigment and adding to the solution or dispersion an additive which includes a material that enhances dielectric permittivity and/or reduces conductivity under conditions effective to produce an ink composition having a conductivity of at most about 200 ?S/cm and a dielectric constant of at least about 60.Type: GrantFiled: January 15, 2003Date of Patent: April 19, 2005Assignees: Xerox Corporation, Sandia CorporationInventors: Raymond W. Wong, Marcel P. Breton, Christine E. Bedford, Leonard M. Carreira, Arthur M. Gooray, George J. Roller, Kevin Zavadil, Paul Galambos, Joseph Crowley
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Publication number: 20040134379Abstract: The present invention relates to an ink composition including water, a solvent, a solvent-soluble dye, and a surfactant, where the ink exhibits a stable liquid microemulsion phase at a first temperature and a second temperature higher than the first temperature and has a conductivity of at most about 200 &mgr;S/cm and a dielectric constant of at least about 60, and methods of making such ink compositions. The present invention also relates to a method of making an ink composition for use in a microelectromechanical system-based fluid ejector. The method involves providing a solution or dispersion including a dye or a pigment and adding to the solution or dispersion an additive which includes a material that enhances dielectric permittivity and/or reduces conductivity under conditions effective to produce an ink composition having a conductivity of at most about 200 &mgr;S/cm and a dielectric constant of at least about 60.Type: ApplicationFiled: January 15, 2003Publication date: July 15, 2004Inventors: Raymond W. Wong, Marcel P. Breton, Christine E. Bedford, Leonard M. Carreira, Arthur M. Gooray, George J. Roller, Kevin Zavadil, Paul Galambos, Joseph Crowley
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Patent number: 6530644Abstract: An improved method of upgrading an image transfer engine such as, for example, an ink jet fluid printer or plotter using liquid ink, or a xerographic device using a liquid toner is disclosed. A removable ink flush tank/cartridge containing an ink cleaner is substituted for a removable ink tank, permitting complete cleaning of ink from the ink fluid flow paths in the engine. This results in less contamination of new inks with previously used inks in the engine.Type: GrantFiled: May 3, 2001Date of Patent: March 11, 2003Assignee: Xerox CorporationInventors: Karai P. Premnath, Thomas J. Trenchard, Leonard M. Carreira, Donald P. Curran, Jr.
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Publication number: 20020163556Abstract: An improved method of upgrading an image transfer engine such as, for example, an ink jet fluid printer or plotter using liquid ink, or a xerographic device using a liquid toner is disclosed. A removable ink flush tank/cartridge containing an ink cleaner is substituted for a removable ink tank, permitting complete cleaning of ink from the ink fluid flow paths in the engine. This results in less contamination of new inks with previously used inks in the engine.Type: ApplicationFiled: May 3, 2001Publication date: November 7, 2002Applicant: XeroxInventors: Karai P. Premnath, Thomas J. Trenchard, Leonard M. Carreira, Donald P. Curran
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Patent number: 6406130Abstract: A fluid ejection system according to this invention operates on the principle of electrostatic or magnetic attraction. In various exemplary embodiments, the fluid ejection system includes a sealed diaphragm arrangement having at least one diaphragm portion and a diaphragm chamber defined at least partially by the at least one diaphragm portion, a nozzle hole located over the at least one diaphragm portion, an ejection chamber defined between the nozzle hole and the least one diaphragm portion and a secondary dielectric fluid reservoir containing a secondary dielectric fluid. The ejection chamber receives a primary fluid to be ejected. The secondary dielectric fluid reservoir is in fluid communication with the diaphragm chamber to supply the secondary dielectric fluid to the diaphragm chamber. In various exemplary embodiments, the secondary dielectric fluid is a liquid, a substantially incompressible fluid, and/or a high performance dielectric fluid having a dielectric constant greater than 1.Type: GrantFiled: February 20, 2001Date of Patent: June 18, 2002Assignee: Xerox CorporationInventors: Arthur M. Gooray, George J. Roller, Joseph M. Crowley, Paul C. Galambos, Frank J. Peter, Kevin R. Zavadil, Richard C. Givler, Leonard M. Carreira
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Patent number: 6176563Abstract: A method of replenishing fluid used in an marking device maintenance station of an ink marking device includes obtaining condensate from ambient air through a condensation process and channeling the condensate to a reservoir in communication with the marking device maintenance station.Type: GrantFiled: January 19, 1999Date of Patent: January 23, 2001Assignee: Xerox CorporationInventors: David G. Anderson, Frederick A. Donahue, Leonard M. Carreira, Arthur M. Gooray
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Patent number: 5925177Abstract: Disclosed is an ink composition which comprises (a) water; (b) Acid Yellow 23 dye; and (c) urea.Type: GrantFiled: May 1, 1998Date of Patent: July 20, 1999Assignee: Xerox CorporationInventors: Leonard M. Carreira, Kathy-Jo Brodsky, Mary Anne Evans, Anne L. Wickett, Christine C. Lyons, Louis V. Isganitis
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Patent number: 5837041Abstract: Ink cartridges containing ink compositions containing nanometer scale pigment particles are produced by preparing a pigment solution including a solubilized pigment-Lewis acid complex and an aprotic solvent system, separating the pigment from the pigment solution to form pigmented particles either by precipitating pigment nanoparticles or by dyeing colloidal particles with the solubilized pigment-Lewis acid complex, concentrating the pigmented particles, then dispersing the pigmented particles in a formulating solvent to form an ink composition, and finally introducing the ink composition into an ink cartridge. The ink compositions are particularly suitable for use in ink jet ink cartridges.Type: GrantFiled: April 15, 1997Date of Patent: November 17, 1998Assignee: Xerox CorporationInventors: Lloyd F. Bean, Bing R. Hsieh, Leonard M. Carreira
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Patent number: 5579693Abstract: A method and apparatus for controlling curl in a liquid ink printer. The liquid ink printer deposits an anticurl material on the side of a printed sheet opposite the one having printing deposited thereon. The anticurl material is a fluid which counteracts the steady state curl in the direction of the printed image resulting from active drying of the printed sheet. The back side of a printed sheet has deposited thereon an anticurl fluid which can contain water, a penetrant, and a humectant like material such as diethylene glycol, ethylene glycol, sulfolane and glycerin. The anticurl material is deposited with a roller made of a foam material for absorbing the anticurl fluid or a roller having dimples disposed on the surface thereof. In addition, the anticurl fluid can be deposited by a spray device or a thermal ink jet printhead ejecting anticurl fluid.Type: GrantFiled: December 12, 1994Date of Patent: December 3, 1996Assignee: Xerox CorporationInventors: Leonard M. Carreira, Arthur M. Gooray, Kenneth C. Peter
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Patent number: 5563644Abstract: Disclosed is a printing process which comprises applying in imagewise fashion to a substrate an ink composition which comprises an aqueous liquid vehicle, a colorant, and a drying component selected from the group consisting of zwitterionic compounds, and subsequently exposing the substrate to microwave radiation, thereby drying the images on the substrate. In a preferred embodiment, the invention is directed to a thermal ink jet printing process which comprises (1) incorporating into a thermal ink jet printing apparatus an ink composition which comprises an aqueous liquid vehicle, a colorant, and a drying component selected from the group consisting of zwitterionic compounds; (2) heating the ink in an imagewise pattern to cause bubbles to form therein, thereby causing droplets of the ink to be ejected in an imagewise pattern onto a substrate, thereby generating images on the substrate; and (3) exposing the substrate to microwave radiation, thereby drying the images on the substrate.Type: GrantFiled: February 3, 1992Date of Patent: October 8, 1996Assignee: Xerox CorporationInventors: Louis V. Isganitis, Edward J. Radigan, Arthur M. Gooray, Leonard M. Carreira, William M. Schwarz
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Patent number: 5500659Abstract: A cleaning apparatus for removing accumulated waste ink from a service or maintenance station of an ink jet printer includes a housing that defines a fluid storage chamber, and at least one output aperture that is formed in a wall of the housing, and communicates with the storage chamber. The cleaning apparatus further includes a cleaning liquid that is stored in the fluid storage chamber for ejecting through the at least one output aperture. The cleaning liquid advantageously includes ink dissolving compositions for dissolving thickened or dried ink waste and other contaminants that have undesirably accumulated in portions of the service or maintenance station.Type: GrantFiled: November 15, 1993Date of Patent: March 19, 1996Assignee: Xerox CorporationInventors: Donald P. Curran, Jr., Lonnie J. Pollocks, Jr., David P. Breemes, Sr., Leonard M. Carreira, Thomas J. Trenchard
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Patent number: 5220346Abstract: Disclosed is a printing process which comprises applying in imagewise fashion to a substrate an ink composition which comprises an aqueous liquid vehicle, a colorant, and an ionic compound at least partially ionizable in the liquid vehicle, said ink composition having a conductivity of at least about 10 milliSiemens per centimeter, and subsequently exposing the substrate to microwave radiation, thereby drying the images on the substrate.Type: GrantFiled: February 3, 1992Date of Patent: June 15, 1993Assignee: Xerox CorporationInventors: Leonard M. Carreira, Arthur M. Gooray, Kenneth C. Peter, Louis V. Isganitis, Edward J. Radigan
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Patent number: 4982237Abstract: A photoelectrophoretic imaging apparatus in which a disposable, electrically biased blocking web has a portion thereof in contact with a moving heated member. A disposable imaging web, electrically biased to a polarity opposite to the polarity of the blocking web, contacts the heated portion of the blocking web. Photosensitive particles dispersed in a normally solid waxy binder matrix are interposed between the imaging web and the blocking web. A light image is projected onto the heated portion of the imaging web contacting the blocking web causing selective migration of the photosensitive particles in the liquefied waxy binder matrix in image configuration.Type: GrantFiled: February 21, 1989Date of Patent: January 1, 1991Assignee: Xerox CorporationInventors: Leonard M. Carreira, Frank Y. Yang
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Patent number: 4032339Abstract: Photosensitive composition for use in photoelectrophoretic imaging system. The particulate component of this composition includes vanadyl phthalocyanine pigment particles which have been treated with a polymer having structural units of the formula ##STR1## WHEREIN Z is a pendant group of the formula ##STR2## X is a substituent substantially incapable of withdrawing electrons from the electron rich pyridinyl moiety;M is a whole number from 0 to 3; andN is a whole number in excess of 25.The intimate association of at least some of the polymer with at least some of the vanadyl phthalocyanine pigment is believed to effectively attenuate photoinjection of holes from the phthalocyanine pigment into the surrounding materials thereby both reducing the D.sub.min of the phthalocyanine pigment; and, to improve color separation of reproductions prepared by processes employing a subtractive color system.Type: GrantFiled: May 24, 1976Date of Patent: June 28, 1977Assignee: Xerox CorporationInventors: Bernard Grushkin, Edward Forest, Leonard M. Carreira