Patents by Inventor Robert Guistina
Robert Guistina 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: 8361689Abstract: The present invention provides an electrostatographic toner that has a condensation polymer binder having carboxylic acid end groups and an acid number of 4 or greater. The carboxylic end groups are converted to metal salts having the structure; (—COO?1)nM+n where M is selected from groups IB, IIB, IIIB, IVB, VB, or IA, IIA, IIIA, IVA, VA, VIA, VIIA and VIIIA of the periodic table and n is an integer from 1-4. The present invention also provides a developer of carrier particles and the electrostatographic toner.Type: GrantFiled: November 5, 2007Date of Patent: January 29, 2013Assignee: Eastman Kodak CompanyInventors: Robert A. Guistina, Dinesh Tyagi, Jason Morgan
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Patent number: 7541130Abstract: The present invention is directed to an electrostatographic toner having a sulfone charge control agent having the structure X—SO2—Y wherein X is an alkyl or aromatic group and Y is an alkyl or aromatic group. The present invention is also directed to an electorstatographic developer containing the electrostatographic toner having a sulfone charge control agent having the structure X—SO2—Y wherein X is an alkyl or aromatic group and Y is an alkyl or aromatic group and carrier particles.Type: GrantFiled: November 1, 2005Date of Patent: June 2, 2009Assignee: Eastman Kodak CompanyInventors: Robert A. Guistina, Dinesh Tyagi, Jason Morgan
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Publication number: 20090117484Abstract: The present invention provides an electrostatographic toner that has a condensation polymer binder having carboxylic acid end groups and an acid number of 4 or greater. The carboxylic end groups are converted to metal salts having the structure; (—COO?1)nM+n where M is selected from groups IB, IIB, IIIB, IVB, VB, or IA, IIA, IIIA, IVA, VA, VIA, VIIA and VIIIA of the periodic table and n is an integer from 1-4. The present invention also provides a developer of carrier particles and the electrostatographic toner.Type: ApplicationFiled: November 5, 2007Publication date: May 7, 2009Inventors: Robert A. Guistina, Dinesh Tyagi, Jason Morgan
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Patent number: 7501218Abstract: The present invention is an electrostatographic toner that includes an organometallic complex of dimethyl sulfoxide with a metal salt as a charge control agent having the structure; (M+n)x ((CH3)2SO2)y (A?q)z where n, q, x and z are integers between 1 and 6, and y is an integer between 2 and 12, The present invention also includes a developer having a toner, an organometallic complex of dimethyl sulfoxide with a metal salt as a charge control agent having the structure; (M+n)x ((CH3)2SO2)y (A?q)z where n, q, x and z are integers between 1 and 6, and y is an integer between 2 and 12, and a carrier particle.Type: GrantFiled: February 17, 2006Date of Patent: March 10, 2009Assignee: Eastman Kodak CompanyInventors: Robert A. Guistina, Jason Morgan, Dinesh Tyagi
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Publication number: 20070099103Abstract: The present invention is directed to an electrostatographic toner having a sulfone charge control agent having the structure X—SO2—Y wherein X is an alkyl or aromatic group and Y is an alkyl or aromatic group. The present invention is also directed to an electorstatographic developer containing the electrostatographic toner having a sulfone charge control agent having the structure X—SO2—Y wherein X is an alkyl or aromatic group and Y is an alkyl or aromatic group and carrier particles.Type: ApplicationFiled: November 1, 2005Publication date: May 3, 2007Inventors: Robert Guistina, Dinesh Tyagi, Jason Morgan
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Publication number: 20060188801Abstract: The present invention is an electrostatographic toner that includes an organometallic complex of dimethyl sulfoxide with a metal salt as a charge control agent having the structure; (M+n)x ((CH3)2SO2)y (A?q)z where n, q, x and z are integers between 1 and 6, and y is an integer between 2 and 12. The present invention also includes a developer having a toner, an organometallic complex of dimethyl sulfoxide with a metal salt as a charge control agent having the structure; (M+n)x ((CH3)2SO2)y (A?q)z where n, q, x and z are integers between 1 and 6, and y is an integer between 2 and 12, and a carrier particle.Type: ApplicationFiled: February 17, 2006Publication date: August 24, 2006Inventors: Robert Guistina, Jason Morgan, Dinesh Tyagi
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Patent number: 6692880Abstract: Toner formulations and developers containing the toner formulations are described. The toner contains at least one toner resin, at least one first charge control agent capable of providing a consistent level of charge, at least one second charge control agent capable of providing a sustained level of charge, at least one surface treatment agent, and at least one release agent and optionally at least one colorant. The toners of the present invention preferably provide a consistent level of charge of from about −10 to about −30 micro C/gm and also provide this level of charge for a sustained period of time, such as from about 2 to about 10 minutes. The toners of the present invention also provides excellent ruboff values for an image printed from the toners of the present invention. Methods of improving ruboff are described as well as methods to develop an image using the toner of the present invention.Type: GrantFiled: May 6, 2002Date of Patent: February 17, 2004Assignee: Heidelberger Druckmaschinen AGInventors: Robert D. Fields, Dinesh Tyagi, John C. Wilson, Peter Alexandrovich, Robert Guistina
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Publication number: 20030073017Abstract: Toner formulations and developers containing the toner formulations are described. The toner contains at least one toner resin, at least one first charge control agent capable of providing a consistent level of charge, at least one second charge control agent capable of providing a sustained level of charge, at least one surface treatment agent, and at least one release agent and optionally at least one colorant. The toners of the present invention preferably provide a consistent level of charge of from about −10 to about −30 micro C/gm and also provide this level of charge for a sustained period of time, such as from about 2 to about 10 minutes. The toners of the present invention also provides excellent ruboff values for an image printed from the toners of the present invention. Methods of improving ruboff are described as well as methods to develop an image using the toner of the present invention.Type: ApplicationFiled: May 6, 2002Publication date: April 17, 2003Inventors: Robert D. Fields, Dinesh Tyagi, John C. Wilson, Peter Alexandrovich, Robert Guistina
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Patent number: 6532354Abstract: A photoreceptor cleaning brush for an electrostatographic imaging apparatus contains individual fibers provided with a finishing agent that is a water-miscible aliphatic organic compound containing a plurality of alcoholic hydroxy substituents. The finishing agent is selected from the group of compounds having a molecular weight of up to about 250 and polyethylene glycols having a number-average molecular weight of about 1000 to about 200,000. In an electrostatographic imaging apparatus, the photoconductive imaging element includes the described photoreceptor cleaning brush and a photoconductive surface portion that contains a polycarbonate binder resin. The cleaning brush removes toner from the photoconductive surface portion of the element without damaging it.Type: GrantFiled: July 24, 2001Date of Patent: March 11, 2003Inventors: James C. Maher, Douglas C. Anderson, Theodore H. Morse, Jiann H. Chen, Robert A. Guistina
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Publication number: 20030031489Abstract: A photoreceptor cleaning brush for use in an electrostatographic imaging apparatus comprises individual fibers provided with a finishing agent comprising a water-miscible aliphatic organic compound containing a plurality of alcoholic hydroxy substituents. The finishing agent is selected from the group of compounds having a molecular weight of up to about 250 and polyethylene glycols having a number-average molecular weight of about 1000 to about 200,000. An improved electrostatographic imaging apparatus includes a photoconductive imaging element and a photoreceptor cleaning brush. The improvement comprises: the photoconductive imaging element having a photoconductive surface portion comprising a polycarbonate binder resin, and the cleaning brush comprising individual fibers provided with a finishing agent comprising a water-miscible aliphatic organic compound containing a plurality of alcoholic hydroxy substituents.Type: ApplicationFiled: July 24, 2001Publication date: February 13, 2003Applicant: NexPress Solutions LLCInventors: James C. Maher, Douglas C. Anderson, Theodore C. Morse, Jiann H. Chen, Robert A. Guistina
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Patent number: 6291127Abstract: The invention relates to an imaging member comprising at least one image layer and a base, said base comprising a cellulose paper that has its surfaces impregnated with water dispersible ester-based condensation polymer wherein the surface of said base has a roughness of less than 2.03 &mgr;m Ra and a hydrophobicity as measured by 40/20 Acid Valley test in excess of 500 seconds.Type: GrantFiled: August 23, 2000Date of Patent: September 18, 2001Assignee: Eastman Kodak CompanyInventors: Sandra J. Dagan, Suresh Sunderrajan, Charles E. Romano, Jr., Robert A. Guistina
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Patent number: 6281268Abstract: A process for making an ink jet ink comprising: a) providing a dispersion containing a pigment, an alcohol carrier and an amine-terminated polyether dispersant; b) mixing the pigment dispersion with rigid milling media less than 100 &mgr;m; c) introducing the mixture of step (b) into a mill; d) milling the mixture from step (c) until the pigment particle size is below about 100 nanometers; e) separating the milling media from the mixture milled in step (d); and f) diluting the mixture from step (e) to obtain an ink jet ink having a pigment concentration suitable for ink jet printers.Type: GrantFiled: December 20, 1999Date of Patent: August 28, 2001Assignee: Eastman Kodak CompanyInventors: Charles E. Romano, Jr., Karen E. Maskasky, Robert A. Guistina
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Patent number: 6258155Abstract: An ink jet ink composition comprising from about 30 to about 90% by weight of an alcohol carrier, from about 0.5 to about 30% by weight of a pigment, from about 0.125 to about 7.5% by weight of an amine-terminated polyether dispersant, and from about 10 to about 50% by weight of a humectant.Type: GrantFiled: December 20, 1999Date of Patent: July 10, 2001Assignee: Eastman Kodak CompanyInventors: Robert A. Guistina, Charles E. Romano, Jr., Karen E. Maskasky
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Patent number: 6210474Abstract: A process for making an ink jet ink comprising: a) providing an organic pigment dispersion containing a pigment and a carrier; b) mixing the pigment dispersion with rigid milling media having an average size less than about 100 &mgr;m; c) introducing the mixture from step b) into a high speed mill; d) milling the mixture from step c) until a pigment particle size distribution is obtained wherein about 50% by weight of the pigment particles have a particle size less than about 100 nanometers; e) separating the milling media from the mixture milled in step d); and f) diluting the mixture from step d) to obtain the ink jet ink; wherein the milling media comprises negatively-charged polymeric beads which are crosslinked sufficiently to prevent swelling of the polymeric beads to levels greater than or equal to about 50 volume % within 4 hours at 25° C. in the carrier.Type: GrantFiled: June 4, 1999Date of Patent: April 3, 2001Assignee: Eastman Kodak CompanyInventors: Charles E. Romano, Jr., Douglas E. Bugner, Richard C. VanHanehem, James R. Bennett, Dennis E. Smith, Robert A. Guistina
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Patent number: 6057072Abstract: A process for making toners substantially free from odors originating from components used in the toner formulation is disclosed. The process involves mixing the toner composition with activated carbon. A composition for odor-free toners also disclosed.Type: GrantFiled: March 31, 1997Date of Patent: May 2, 2000Assignee: Eastman Kodak CompanyInventors: Robert A. Guistina, Dinesh Tyagi
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Patent number: 6020032Abstract: A method for making an ink jet recording element comprising simultaneously coating on a support the following layers in order:a) a nonionic, water-dispersible, condensation polymer gloss-enhancing layer; andb) an ink receptive layer for an ink jet image.Type: GrantFiled: November 18, 1998Date of Patent: February 1, 2000Assignee: Eastman Kodak CompanyInventors: Charles E. Romano, Jr., Eric L. Boyle, Robert A. Guistina
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Patent number: 5928990Abstract: A thermal dye transfer assemblage comprising:(I) a dye-donor element comprising a support having thereon sequentially repeating dye layer patches of a dye dispersed in a polymeric binder, at least one of the dye patches containing a deprotonated cationic dye which is capable of being reprotonated to a cationic dye having a N-H group which is part of a conjugated system; and(II) a dye-receiving element comprising a support having thereon a polymeric dye image-receiving layer comprising a polyester polymer which itself does not significantly reprotonate deprotonated cationic dyes which may be transferred from the dye-donor element, to which has been added a hydrated transition metal or metalloid salt of a strong acid;the dye-receiving element being in a superposed relationship with the dye-donor element so that the dye layer is in contact with the polymeric dye image-receiving layer.Type: GrantFiled: December 22, 1997Date of Patent: July 27, 1999Assignee: Eastman Kodak CompanyInventors: Robert A. Guistina, Elizabeth G. Burns, Teh-Ming Kung, Kristine B. Lawrence, Richard C. VanHanehem
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Patent number: 5789342Abstract: A thermal dye transfer assemblage comprising:(I) a dye-donor element comprising a support having thereon sequentially repeating dye layer patches of a dye dispersed in a polymeric binder, at least one of the dye patches containinga) a deprotonated cationic dye which is capable of being reprotonated to a cationic dye having a N--H group which is part of a conjugated system, and at least one other of the dye patches containingb) a pendant basic-substituted dye having the formula:A-(L-B).sub.Type: GrantFiled: June 19, 1997Date of Patent: August 4, 1998Assignee: Eastman Kodak CompanyInventors: Steven Evans, Robert A. Guistina, Kristine B. Lawrence, Helmut Weber
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Patent number: 5789143Abstract: This invention relates to a silver halide color photographic element comprising a support, a silver halide emulsion and poly(thioether)s wherein greater than 50 percent of the poly(thioether)s have acidic functional end groups with an aqueous pKa.ltoreq.10, or end groups which will react to form acidic functional end groups with an aqueous pKa.ltoreq.10 during development, on both termini and wherein the poly(thioether)s have a molecular weight greater than 800.Type: GrantFiled: April 30, 1997Date of Patent: August 4, 1998Assignee: Eastman Kodak CompanyInventors: George J. Burgmaier, David A. Dickinson, Robert A. Guistina
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Patent number: 5789343Abstract: A thermal dye transfer assemblage comprising:(I) a dye-donor element comprising a support having thereon sequentially repeating dye layer patches of a dye dispersed in a polymeric binder, at least one of the dye patches containing a deprotonated cationic dye which is capable of being reprotonated to a cationic dye having a N--H group which is part of a conjugated system; and(II) a dye-receiving element comprising a support having thereon a polymeric dye image-receiving layer comprising a vinyl polymer having no or only slight acidity and a hydrated transition metal or metalloid salt of a strong acid, the dye-receiving element being in a superposed relationship with the dye-donor element so that the dye layer is in contact with the polymeric dye image-receiving layer.Type: GrantFiled: June 19, 1997Date of Patent: August 4, 1998Assignee: Eastman Kodak CompanyInventors: Robert A. Guistina, Wayne A. Bowman, Elizabeth G. Burns, Susan L. Dawson, Kristine B. Lawrence, Richard C. VanHanehem