Patents by Inventor Mahya Mokhtari
Mahya Mokhtari 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: 10619067Abstract: Processes for preparing stabilized metal-containing nanoparticles comprising silver and/or a silver alloy composite by reacting a silver compound with a reducing agent comprising a hydrazine compound at a temperature between about 20° C. and about 60° C. The reaction being carried out by incrementally adding the silver compound or a mixture of the silver compound and a stabilizer to a solution comprising the reducing agent, a stabilizer, and a solvent. Conductive ink compositions containing stabilized metal-containing nanoparticles prepared by such processes.Type: GrantFiled: May 8, 2017Date of Patent: April 14, 2020Assignee: XEROX CORPORATIONInventors: Ping Liu, Mahya Mokhtari, Tila Tahmoures-Zadeh, Roger Gaynor, Yiliang Wu, Nan-Xing Hu
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Publication number: 20170240758Abstract: Processes for preparing stabilized metal-containing nanoparticles comprising silver and/or a silver alloy composite by reacting a silver compound with a reducing agent comprising a hydrazine compound at a temperature between about 20° C. and about 60° C. The reaction being carried out by incrementally adding the silver compound or a mixture of the silver compound and a stabilizer to a solution comprising the reducing agent, a stabilizer, and a solvent. Conductive ink compositions containing stabilized metal-containing nanoparticles prepared by such processes.Type: ApplicationFiled: May 8, 2017Publication date: August 24, 2017Applicant: XEROX CORPORATIONInventors: Ping Liu, Mahya Mokhtari, Tila Tahmoures-Zadeh, Roger Gaynor, Yiliang Wu, Nan-Xing Hu
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Conductive ink compositions and methods for preparation of stabilized metal-containing nanoparticles
Patent number: 9725614Abstract: Processes for preparing stabilized metal-containing nanoparticles comprising silver and/or a silver alloy composite by reacting a silver compound with a reducing agent comprising a hydrazine compound at a temperature between about 20° C. and about 60° C. The reaction being carried out by incrementally adding the silver compound or a mixture of the silver compound and a stabilizer to a solution comprising the reducing agent, a stabilizer, and a solvent. Conductive ink compositions containing stabilized metal-containing nanoparticles prepared by such processes.Type: GrantFiled: April 19, 2013Date of Patent: August 8, 2017Assignee: XEROX CORPORATIONInventors: Ping Liu, Mahya Mokhtari, Tila Tahmoures-Zadeh, Roger Gaynor, Yiliang Wu, Nan-Xing Hu -
Patent number: 9529286Abstract: Antioxidants used for overcoat layers and processes for making the same. The present process for making the antioxidant has proven to be repeatable, cheaper, faster and safer than conventional processes. In particular, the present process uses a different solvent system where crude bis(4-diethylamino-2-methylphenyl)-(4-diethylaminophenylmethane) is dissolved in methylethyl ketone at room temperature, followed by product precipitation in a warm mixture of ethanol and water.Type: GrantFiled: October 11, 2013Date of Patent: December 27, 2016Assignee: XEROX CORPORATIONInventors: Mahya Mokhtari, Marko D. Saban
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Publication number: 20150240102Abstract: A low viscosity and a high loading silver nanoparticle conductive ink having at least about 50% weight of silver nanoparticles, a solvent having a viscosity equal to or less than about 1 cps, and a stabilizer. The conductive ink has a viscosity of less than about 5 cps and is suitable for an ultrasonic sprayer printing ink.Type: ApplicationFiled: February 24, 2014Publication date: August 27, 2015Applicant: XEROX CORPORATIONInventors: Ping Liu, Yiliang Wu, Mahya Mokhtari, Naveen Chopra, Matthew A. Heuft, Rosa Duque
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Publication number: 20150240101Abstract: A high silver content nanosilver conductive ink includes at least about 65% weight of silver nanoparticles, a non-polar organic solvent and, a polymer binder. The conductive ink has a has a conductivity of from about 1.0×104 (S/cm) to about 4.0×105 (S/cm). and a viscosity of from about 20 cps to about 1,000 cps.Type: ApplicationFiled: February 24, 2014Publication date: August 27, 2015Applicant: XEROX CORPORATIONInventors: Naveen Chopra, Ping Liu, Cuong Vong, Sandra Gardner, Yiliang Wu, Mahya Mokhtari
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Patent number: 9105373Abstract: In an embodiment, there is a method of preparing a conductive ink formulation. The method can include dissolving a stabilizer in a first solvent, adding a reducing agent to the first solvent, adding a metal salt to the first solvent and forming a slurry by precipitating stabilized metal nanoparticles in the first solvent. The method can also include forming a wet cake of the stabilized metal nanoparticles and adding the wet cake to a second solvent. The second solvent can include at least one of a polyvinyl alcohol derivative. The wet cake may not be actively dried prior to being added to the second solvent.Type: GrantFiled: June 19, 2013Date of Patent: August 11, 2015Assignee: XEROX CORPORATIONInventors: Mahya Mokhtari, Tila Tahmoures-Zadeh, Roger E. Gaynor
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Publication number: 20150102529Abstract: Antioxidants used for overcoat layers and processes for making the same. The present process for making the antioxidant has proven to be repeatable, cheaper, faster and safer than conventional processes. In particular, the present process uses a different solvent system where crude bis(4-diethylamino-2-methylphenyl)-(4-diethylaminophenylmethane) is dissolved in methylethyl ketone at room temperature, followed by product precipitation in a warm mixture of ethanol and water.Type: ApplicationFiled: October 11, 2013Publication date: April 16, 2015Applicant: XEROX CORPORATIONInventors: Mahya Mokhtari, Marko D. Saban
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Publication number: 20140374670Abstract: In an embodiment, there is a method of preparing a conductive ink formulation. The method can include dissolving a stabilizer in a first solvent, adding a reducing agent to the first solvent, adding a metal salt to the first solvent and forming a slurry by precipitating stabilized metal nanoparticles in the first solvent. The method can also include forming a wet cake of the stabilized metal nanoparticles and adding the wet cake to a second solvent. The second solvent can include at least one of a polyvinyl alcohol derivative. The wet cake may not be actively dried prior to being added to the second solvent.Type: ApplicationFiled: June 19, 2013Publication date: December 25, 2014Inventors: Mahya Mokhtari, Tila Tahmoures-Zadeh, Roger E. Gaynor
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CONDUCTIVE INK COMPOSITIONS AND METHODS FOR PREPARATION OF STABILIZED METAL-CONTAINING NANOPARTICLES
Publication number: 20140312284Abstract: Processes for preparing stabilized metal-containing nanoparticles comprising silver and/or a silver alloy composite by reacting a silver compound with a reducing agent comprising a hydrazine compound at a temperature between about 20° C. and about 60° C. The reaction being carried out by incrementally adding the silver compound or a mixture of the silver compound and a stabilizer to a solution comprising the reducing agent, a stabilizer, and a solvent. Conductive ink compositions containing stabilized metal-containing nanoparticles prepared by such processes.Type: ApplicationFiled: April 19, 2013Publication date: October 23, 2014Applicant: XEROX CORPORATIONInventors: Ping Liu, Mahya Mokhtari, Tila Tahmoures-Zadeh, Roger Gaynor, Yiliang Wu, Nan-Xing Hu -
Patent number: 8834965Abstract: Processes for producing organoamine-stabilized silver nanoparticles are disclosed. The processes comprise: (a) forming a solution comprising an organic solvent and a first amount of organoamine; (b) adding silver salt particles to the solution; (c) adding a second amount of organoamine to the solution; (d) adding an organohydrazine to the solution; and (e) reacting the solution to form organoamine-stabilized silver nanoparticles.Type: GrantFiled: February 12, 2009Date of Patent: September 16, 2014Assignee: Xerox CorporationInventors: Mahya Mokhtari, Marko D. Saban, Roger Earl Gaynor
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Patent number: 8460584Abstract: Processes for producing carboxylic acid-stabilized silver nanoparticles are disclosed. The processes comprise (a) forming a suspension of silver salt particles in a carboxylic acid; (b) forming a solution of an organohydrazine and a first organic solvent; (c) heating the suspension; (d) adding the solution to the suspension to form a mixture; and (e) reacting the mixture to form carboxylic acid-stabilized silver nanoparticles.Type: GrantFiled: October 14, 2008Date of Patent: June 11, 2013Assignee: Xerox CorporationInventors: Mahya Mokhtari, Marko Saban, Roger Earl Gaynor
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Patent number: 8147908Abstract: Process for producing organoamine-stabilized silver nanoparticles with a molar ratio of silver salt to organoamine of about 1:4 to about 1:10 are disclosed. The process includes: forming a solution including an organic solvent and a first amount of organoamine; adding silver salt particles to the solution; adding a second amount of organoamine to the solution; adding a hydrazine to the solution; and reacting the solution to form an organoamine-stabilized silver nanoparticles.Type: GrantFiled: June 9, 2010Date of Patent: April 3, 2012Assignee: Xerox CorporationInventors: Mahya Mokhtari, Roger E. Gaynor, Marko D. Saban
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Publication number: 20110305826Abstract: Process for producing organoamine-stabilized silver nanoparticles with a molar ratio of silver salt to organoamine of about 1:4 to about 1:10 are disclosed. The process includes: forming a solution including an organic solvent and a first amount of organoamine; adding silver salt particles to the solution; adding a second amount of organoamine to the solution; adding a hydrazine to the solution; and reacting the solution to form an organoamine-stabilized silver nanoparticles.Type: ApplicationFiled: June 9, 2010Publication date: December 15, 2011Applicant: XEROX CORPORATIONInventors: Mahya MOKHTARI, Roger E. Gaynor, Marko D. Saban
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Patent number: 7935278Abstract: A process including: (a) forming a feature comprising uncoalesced silver-containing nanoparticles; (b) heating the uncoalesced silver-containing nanoparticles to form coalesced silver-containing nanoparticles wherein the feature comprising the coalesced silver-containing nanoparticles exhibits a low electrical conductivity; and (c) subjecting the coalesced silver-containing nanoparticles to an acid-containing composition to increase the electrical conductivity of the feature by at least about 100 times.Type: GrantFiled: March 5, 2009Date of Patent: May 3, 2011Assignee: Xerox CorporationInventors: Yiliang Wu, Mahya Mokhtari
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Publication number: 20100224837Abstract: A process including: (a) forming a feature comprising uncoalesced silver-containing nanoparticles; (b) heating the uncoalesced silver-containing nanoparticles to form coalesced silver-containing nanoparticles wherein the feature comprising the coalesced silver-containing nanoparticles exhibits a low electrical conductivity; and (c) subjecting the coalesced silver-containing nanoparticles to an acid-containing composition to increase the electrical conductivity of the feature by at least about 100 times.Type: ApplicationFiled: March 5, 2009Publication date: September 9, 2010Applicant: Xerox CorporationInventors: Yiliang Wu, Mahya Mokhtari
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Publication number: 20100226811Abstract: A process comprising: (a) forming a feature comprising uncoalesced silver-containing nanoparticles; (b) heating the uncoalesced silver-containing nanoparticles to form coalesced silver-containing nanoparticles; and (c) subjecting to a plasma treatment the uncoalesced silver-containing nanoparticles or the coalesced silver-containing nanoparticles, or both the uncoalesced silver-containing nanoparticles and the coalesced silver-containing nanoparticles, wherein the feature prior to the action (c) exhibits a low electrical conductivity but the electrical conductivity of the feature subsequent to the actions (b) and (c) is increased by at least about 100 times, wherein the action (c) is undertaken during one or more of prior to the heating, or during the heating, or after the heating.Type: ApplicationFiled: March 5, 2009Publication date: September 9, 2010Applicant: XEROX CORPORATIONInventors: Yiliang Wu, Mahya Mokhtari
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Publication number: 20100203333Abstract: Processes for producing organoamine-stabilized silver nanoparticles are disclosed. The processes comprise: (a) forming a solution comprising an organic solvent and a first amount of organoamine; (b) adding silver salt particles to the solution; (c) adding a second amount of organoamine to the solution; (d) adding an organohydrazine to the solution; and (e) reacting the solution to form organoamine-stabilized silver nanoparticles.Type: ApplicationFiled: February 12, 2009Publication date: August 12, 2010Applicant: XEROX CORPORATIONInventors: Mahya Mokhtari, Marko D. Saban, Roger Earl Gaynor
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Publication number: 20100090179Abstract: Processes for producing carboxylic acid-stabilized silver nanoparticles are disclosed. The processes comprise (a) forming a suspension of silver salt particles in a carboxylic acid; (b) forming a solution of an organohydrazine and a first organic solvent; (c) heating the suspension; (d) adding the solution to the suspension to form a mixture; and (e) reacting the mixture to form carboxylic acid-stabilized silver nanoparticles.Type: ApplicationFiled: October 14, 2008Publication date: April 15, 2010Applicant: XEROX CORPORATIONInventors: Mahya Mokhtari, Marko Saban, Roger Earl Gaynor