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).

  • Patent number: 10619067
    Abstract: 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: Grant
    Filed: May 8, 2017
    Date of Patent: April 14, 2020
    Assignee: XEROX CORPORATION
    Inventors: Ping Liu, Mahya Mokhtari, Tila Tahmoures-Zadeh, Roger Gaynor, Yiliang Wu, Nan-Xing Hu
  • Publication number: 20170240758
    Abstract: 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: Application
    Filed: May 8, 2017
    Publication date: August 24, 2017
    Applicant: XEROX CORPORATION
    Inventors: Ping Liu, Mahya Mokhtari, Tila Tahmoures-Zadeh, Roger Gaynor, Yiliang Wu, Nan-Xing Hu
  • Patent number: 9725614
    Abstract: 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: Grant
    Filed: April 19, 2013
    Date of Patent: August 8, 2017
    Assignee: XEROX CORPORATION
    Inventors: Ping Liu, Mahya Mokhtari, Tila Tahmoures-Zadeh, Roger Gaynor, Yiliang Wu, Nan-Xing Hu
  • Patent number: 9529286
    Abstract: 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: Grant
    Filed: October 11, 2013
    Date of Patent: December 27, 2016
    Assignee: XEROX CORPORATION
    Inventors: Mahya Mokhtari, Marko D. Saban
  • Publication number: 20150240102
    Abstract: 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: Application
    Filed: February 24, 2014
    Publication date: August 27, 2015
    Applicant: XEROX CORPORATION
    Inventors: Ping Liu, Yiliang Wu, Mahya Mokhtari, Naveen Chopra, Matthew A. Heuft, Rosa Duque
  • Publication number: 20150240101
    Abstract: 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: Application
    Filed: February 24, 2014
    Publication date: August 27, 2015
    Applicant: XEROX CORPORATION
    Inventors: Naveen Chopra, Ping Liu, Cuong Vong, Sandra Gardner, Yiliang Wu, Mahya Mokhtari
  • Patent number: 9105373
    Abstract: 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: Grant
    Filed: June 19, 2013
    Date of Patent: August 11, 2015
    Assignee: XEROX CORPORATION
    Inventors: Mahya Mokhtari, Tila Tahmoures-Zadeh, Roger E. Gaynor
  • Publication number: 20150102529
    Abstract: 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: Application
    Filed: October 11, 2013
    Publication date: April 16, 2015
    Applicant: XEROX CORPORATION
    Inventors: Mahya Mokhtari, Marko D. Saban
  • Publication number: 20140374670
    Abstract: 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: Application
    Filed: June 19, 2013
    Publication date: December 25, 2014
    Inventors: Mahya Mokhtari, Tila Tahmoures-Zadeh, Roger E. Gaynor
  • Publication number: 20140312284
    Abstract: 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: Application
    Filed: April 19, 2013
    Publication date: October 23, 2014
    Applicant: XEROX CORPORATION
    Inventors: Ping Liu, Mahya Mokhtari, Tila Tahmoures-Zadeh, Roger Gaynor, Yiliang Wu, Nan-Xing Hu
  • Patent number: 8834965
    Abstract: 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: Grant
    Filed: February 12, 2009
    Date of Patent: September 16, 2014
    Assignee: Xerox Corporation
    Inventors: Mahya Mokhtari, Marko D. Saban, Roger Earl Gaynor
  • Patent number: 8460584
    Abstract: 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: Grant
    Filed: October 14, 2008
    Date of Patent: June 11, 2013
    Assignee: Xerox Corporation
    Inventors: Mahya Mokhtari, Marko Saban, Roger Earl Gaynor
  • Patent number: 8147908
    Abstract: 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: Grant
    Filed: June 9, 2010
    Date of Patent: April 3, 2012
    Assignee: Xerox Corporation
    Inventors: Mahya Mokhtari, Roger E. Gaynor, Marko D. Saban
  • Publication number: 20110305826
    Abstract: 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: Application
    Filed: June 9, 2010
    Publication date: December 15, 2011
    Applicant: XEROX CORPORATION
    Inventors: Mahya MOKHTARI, Roger E. Gaynor, Marko D. Saban
  • Patent number: 7935278
    Abstract: 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: Grant
    Filed: March 5, 2009
    Date of Patent: May 3, 2011
    Assignee: Xerox Corporation
    Inventors: Yiliang Wu, Mahya Mokhtari
  • Publication number: 20100224837
    Abstract: 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: Application
    Filed: March 5, 2009
    Publication date: September 9, 2010
    Applicant: Xerox Corporation
    Inventors: Yiliang Wu, Mahya Mokhtari
  • Publication number: 20100226811
    Abstract: 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: Application
    Filed: March 5, 2009
    Publication date: September 9, 2010
    Applicant: XEROX CORPORATION
    Inventors: Yiliang Wu, Mahya Mokhtari
  • Publication number: 20100203333
    Abstract: 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: Application
    Filed: February 12, 2009
    Publication date: August 12, 2010
    Applicant: XEROX CORPORATION
    Inventors: Mahya Mokhtari, Marko D. Saban, Roger Earl Gaynor
  • Publication number: 20100090179
    Abstract: 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: Application
    Filed: October 14, 2008
    Publication date: April 15, 2010
    Applicant: XEROX CORPORATION
    Inventors: Mahya Mokhtari, Marko Saban, Roger Earl Gaynor