Patents by Inventor Neha Mehta
Neha Mehta 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: 20240043452Abstract: The present invention relates to a method of synthesizing copper (I) 5-nitrotetrazolate. The method involves a series of interconnected steps. Initially, a stock solution of sodium 5-nitrotetrazolate is prepared in water from 5-aminotetrazole nitrate, which is then preserved for later use in producing copper (I) 5-nitrotetrazolate thereby eliminating the need for immediate utilization. A nascent Copper (I) chloride is prepared separately. In a single step, the stock solution of sodium 5-nitrotetrazolate is coupled with the nascent copper (I) chloride, resulting in the formation of copper (I) 5-nitrotetrazolate.Type: ApplicationFiled: September 7, 2023Publication date: February 8, 2024Inventors: BRAJA SUNDAR PRADHAN, NEHA MEHTA, KEYUR PATEL
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Patent number: 11312729Abstract: The present invention is directed to a process for continuous production of copper (I) nitrotetrazolate (DBX-1) by reacting aqueous copper salt with aqueous 5-nitrotetrazolate salt in the presence of a reducing agent. All the reactants are introduced into a continuous flow reactor system, which is composed of a temperature controlled tubular reactor and a mixer that allows for radial mixing. An optional stirred tank reactor may also be incorporated into the process to complete the reaction and allow for crystal growth.Type: GrantFiled: October 17, 2019Date of Patent: April 26, 2022Assignee: The United States of America as Represented by the Secretary of the ArmyInventors: Neha Mehta, Jon G. Bragg, Matthew L. Jorgensen, Andrew G. Pearsall, Jerry S. Salan, Daniel W. Ward
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Patent number: 10947204Abstract: The present invention is directed to a method for preparing 5-nitrotetrazolate using a strongly acidic ionic cation exchange resin that has improve yields over prior art methods. The methods disclosed herein can be used either in a batch process or continuous flow reactor. In one exemplary process, starting material sodium 5-aminotetrazolate in solution is added into a reaction vessel containing a strongly acidic ionic cation exchange resin to facilitate production of 5-nitrotetrazolate. Multiple reactors containing resins may be connected in series to improve 5-nitrotetrazolate yields and purity levels.Type: GrantFiled: October 17, 2019Date of Patent: March 16, 2021Assignee: U.S. Government as Represented by the Secretary of the ArmyInventors: R. Hunter Muir, Andrew G. Pearsall, Jerry S. Salan, Matthew L. Jorgensen, Jon G. Bragg, Neha Mehta, John W. Fronabarger, Jason B. Pattison, Lily F. W. Walsh
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Patent number: 9752857Abstract: Lead free microdet electric detonators comprising a bridgewire having milled DBX-1 as a spot charge and unmilled DBX-1 as the intermediate material. Such improved microdet electric detonator is free of lead azide and lead styphnate, but with comparable stability, power and sensitivity to current lead-based M100 electric detonators.Type: GrantFiled: February 4, 2016Date of Patent: September 5, 2017Assignee: The United States of America as Represented by the Secretary of the ArmyInventors: Neha Mehta, Gartung Cheng, Kin Yee, Karl Oyler, Akash Shah, John Marin, John W. Fronabarger, Michael D. Williams, Steven H. Marino, Pamela Tran
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Patent number: 9440934Abstract: A method of manufacture of the primary explosive material copper(I) 5-nitrotetazolate (DBX-1) by a synthesis starting with 5-aminotetrazolate (5-AT); wherein, the synthesis provides intermediates acid copper salt of 5-NT and sodium 5-nitrotetrazolate (NaNT) sodium 5-nitrotetrazolate (NaNT)—that are both, free of any 5-aminotetrazolate (5-AT) starting material—such that the subsequent production of the DBX-1 is not inhibited. Further, this method utilizes an internal filter within the reactor—to minimize handling of explosively dangerous intermediates.Type: GrantFiled: February 23, 2015Date of Patent: September 13, 2016Assignee: The United States of America as Represented by the Secretary of the ArmyInventors: Neha Mehta, Karl Oyler, Gartung Cheng, Jerry Salan, Shannon Lenahan
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Patent number: 9409830Abstract: A non-toxic primer mix in which DBX-1 (copper(I) 5-nitrotetrazole) acts as the primary explosive portion of the primer. Furthermore, in this mix, boron carbide (B4C) replaces the traditional frictionator/fuel, toxic antimony trisulfide. In addition, potassium nitrate replaces the toxic barium nitrate (BaNO3)2) as the oxidizer, providing an ignition flame from the primer in a pyrotechnic reaction. The non-toxic primer therefore embodies a lead-free, barium-free, antimony-free explosive material that can include added fuels, sensitizers, explosives and/or binders.Type: GrantFiled: October 14, 2015Date of Patent: August 9, 2016Assignee: The United States of America as Represented by the Secretary of the ArmyInventors: Christopher M. Csernica, Karl D. Oyler, Jesse J. Sabatini, Neha Mehta
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Patent number: 8636861Abstract: Secondary crystalline high explosives are disclosed which are suitable for filling very small volume loading holes in micro-electric initiators for micro-electro-mechanical mechanisms (MEMS), used as safe and arm (S&A) devices. The explosives are prepared by adding the such a high explosive to an aqueous first volatile mobile phase, adding such a high explosive to a non-aqueous second volatile mobile phase, mixing the first and second volatile mobile phases and then loading the combined phases into the MEMS device and allowing the aqueous and non-aqueous solvents to evaporate depositing the high explosive. Enhanced adhesion between the deposited high explosive and enhanced rheological properties can be obtained by adding a polymeric binder to both mobile phases.Type: GrantFiled: December 29, 2010Date of Patent: January 28, 2014Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Daniel Stec, III, Amy Wilson, Brian E. Fuchs, Neha Mehta, Paula Cook
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Patent number: 8466317Abstract: A method for preparing an insensitive bis(2,2-dinitropropyl)nitramine (BDNPN) as a fine powder which exhibits desirable insensitive munitions (IM) characteristics for use alone or compounded with other energetic materials such as RDX.Type: GrantFiled: July 6, 2011Date of Patent: June 18, 2013Assignee: The United States of America as Represented by the Secretary of the ArmyInventors: Daniel Stec, III, Kathy Yang, Gartung Cheng, Neha Mehta, Paritosh R. Dave
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Patent number: 7981225Abstract: A lead-free primer energetic composition including Cyanuric Triazide (60%), Tetracene (5%), Barium Nitrate (20%) and Antimony Trisulfide (15%) is produced. The lead-free primer energetic composition is used to construct a primary detonator including a transfer charge of Cyanuric Triazide, which produces a further initiation train that may subsequently detonate a secondary explosive, i.e., HDX, RDX, or a pyrotechnic device.Type: GrantFiled: October 19, 2006Date of Patent: July 19, 2011Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Neha Mehta, Gartumg Cheng, Emily A. Cordaro, Neelam Mehta, Carl Hu, Robert Lateer, Daniel Stec, III, Raja G. Duddu, Paritosh R. Dave, Kathy Yang
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Patent number: 7976654Abstract: High explosives suitable for filling very small volume loading holes in micro-electric initiators for micro-electro-mechanical mechanisms, used as safe and arm devices, are prepared from slurries of crystalline energetic materials including organic liquid and applied using various methods. These methods include swipe loading, pressure loading and syringe loading. The organic liquid serves as a volatile mobile phase in the slurry so as to partially dissolve the energetic material so that, upon evaporation of the mobile phase, the energetic material precipitates and adheres to the loading hole.Type: GrantFiled: July 17, 2009Date of Patent: July 12, 2011Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Daniel Stec, III, Gartung Cheng, Brian E. Fuchs, Gerard Gillen, Neha Mehta
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Patent number: 7967929Abstract: Secondary crystalline high explosives are disclosed which are suitable for filling very small volume loading holes in micro-electric initiators for micro-electro-mechanical mechanisms (MEMS), used as safe and arm (S&A) devices. The explosives are prepared by adding the such a high explosive to an aqueous first volatile mobile phase, adding such a high explosive to a non-aqueous second volatile mobile phase, mixing the first and second volatile mobile phases and then loading the combined phases into the MEMS device and allowing the aqueous and non-aqueous solvents to evaporate depositing the high explosive. Enhanced adhesion between the deposited high explosive and enhanced rheological properties can be obtained by adding a polymeric binder to both mobile phases.Type: GrantFiled: December 28, 2009Date of Patent: June 28, 2011Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Daniel Stec, III, Amy Wilson, Brian E. Fuchs, Neha Mehta, Paula Cook
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Patent number: 7964045Abstract: High explosive coatings and inks suitable for use in micro-electronic initiators for micro-electro-mechanical mechanisms used as safe and arm devices, are prepared from coating compositions of crystalline energetic materials and applied using various methods. These methods include wiping and spraying, as well as, pressure applications using a syringe or the like, and application of thick film ink to write specified patterns on a selected surface. A volatile mobile phase may be added to the coating composition to partially dissolve the energetic material so that, upon evaporation of the mobile phase, the energetic material precipitates and adheres to the selected surface.Type: GrantFiled: May 15, 2009Date of Patent: June 21, 2011Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Daniel Stec, III, Gartung Cheng, Brian E. Fuchs, Neha Mehta
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Patent number: 7712419Abstract: A detonator for a hand grenade fuze comprises a detonator case; a slider that is transversely reciprocable in the detonator case from an unarmed position to an armed position, the slider including a longitudinal through-hole filled with a primary explosive; a spring that biases the slider to the unarmed position; an arming mechanism attached to the slider, the arming mechanism comprising a shape memory alloy; an explosive lead disposed below the slider; and a booster charge disposed below the explosive lead.Type: GrantFiled: May 11, 2007Date of Patent: May 11, 2010Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Gartung Cheng, Neha Mehta, Emily A. Cordaro, Gregory Papatrefon, Carl Hu, Brian Fuchs, Neelam Mehta, Kathy Yang
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Publication number: 20100024933Abstract: High explosives suitable for filling very small volume loading holes in micro-electric initiators for micro-electro-mechanical mechanisms, used as safe and arm devices, are prepared from slurries of crystalline energetic materials including organic liquid and applied using various methods. These methods include swipe loading, pressure loading and syringe loading. The organic liquid serves as a volatile mobile phase in the slurry so as to partially dissolve the energetic material so that, upon evaporation of the mobile phase, the energetic material precipitates and adheres to the loading hole.Type: ApplicationFiled: February 15, 2006Publication date: February 4, 2010Inventors: Daniel Stec, III, Gartung Cheng, Brian E. Fuchs, Gerard Gillen, Neha Mehta
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Patent number: 7407638Abstract: The present invention discloses a process for the on-demand production of small quantities of lead azide. First, a metered quantity of sodium azide solution and a metered quantity of a solution of a lead salt sufficient to react with the sodium azide are introduced into a T-mixer or Y-mixer. Then, the sodium azide and lead salt solutions are conveyed into a static mixer and the azide and lead compounds are permitted to react together, forming insoluble crystals of lead azide as a slurry in an aqueous medium. The lead azide crystals are then separated from the aqueous medium. The process is carried out within an explosion-proof chamber.Type: GrantFiled: February 28, 2005Date of Patent: August 5, 2008Assignee: The United States of America as represented by the Secretary of the ArmyInventors: Andrew Perich, Emily A. Cordaro, Gartung Cheng, Neha Mehta, Daniel Stec, III
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Patent number: 7052562Abstract: High explosives suitable for filling very small volume loading holes in micro-electric initiators for micro-electro-mechanical mechanisms, used as safe and arm devices, are prepared from slurries of crystalline energetic materials and applied using various methods. These methods include swipe loading, pressure loading and syringe loading. A volatile mobile phase may be added to the slurry so as to partially dissolve the energetic material so that, upon evaporation of the mobile phase, the energetic material precipitates and adheres to the loading hole.Type: GrantFiled: February 28, 2003Date of Patent: May 30, 2006Assignee: The United State of America as represented by the Secretary of the ArmyInventors: Daniel Stec, III, Gartung Cheng, Brian E. Fuchs, Gerard Gillen, Neha Mehta