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).

  • Patent number: 11312729
    Abstract: 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: Grant
    Filed: October 17, 2019
    Date of Patent: April 26, 2022
    Assignee: The United States of America as Represented by the Secretary of the Army
    Inventors: Neha Mehta, Jon G. Bragg, Matthew L. Jorgensen, Andrew G. Pearsall, Jerry S. Salan, Daniel W. Ward
  • Patent number: 10947204
    Abstract: 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: Grant
    Filed: October 17, 2019
    Date of Patent: March 16, 2021
    Assignee: U.S. Government as Represented by the Secretary of the Army
    Inventors: 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
  • Patent number: 9752857
    Abstract: 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: Grant
    Filed: February 4, 2016
    Date of Patent: September 5, 2017
    Assignee: The United States of America as Represented by the Secretary of the Army
    Inventors: Neha Mehta, Gartung Cheng, Kin Yee, Karl Oyler, Akash Shah, John Marin, John W. Fronabarger, Michael D. Williams, Steven H. Marino, Pamela Tran
  • Patent number: 9440934
    Abstract: 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: Grant
    Filed: February 23, 2015
    Date of Patent: September 13, 2016
    Assignee: The United States of America as Represented by the Secretary of the Army
    Inventors: Neha Mehta, Karl Oyler, Gartung Cheng, Jerry Salan, Shannon Lenahan
  • Patent number: 9409830
    Abstract: 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: Grant
    Filed: October 14, 2015
    Date of Patent: August 9, 2016
    Assignee: The United States of America as Represented by the Secretary of the Army
    Inventors: Christopher M. Csernica, Karl D. Oyler, Jesse J. Sabatini, Neha Mehta
  • Patent number: 8636861
    Abstract: 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: Grant
    Filed: December 29, 2010
    Date of Patent: January 28, 2014
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Daniel Stec, III, Amy Wilson, Brian E. Fuchs, Neha Mehta, Paula Cook
  • Patent number: 8466317
    Abstract: 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: Grant
    Filed: July 6, 2011
    Date of Patent: June 18, 2013
    Assignee: The United States of America as Represented by the Secretary of the Army
    Inventors: Daniel Stec, III, Kathy Yang, Gartung Cheng, Neha Mehta, Paritosh R. Dave
  • Patent number: 7981225
    Abstract: 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: Grant
    Filed: October 19, 2006
    Date of Patent: July 19, 2011
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Neha Mehta, Gartumg Cheng, Emily A. Cordaro, Neelam Mehta, Carl Hu, Robert Lateer, Daniel Stec, III, Raja G. Duddu, Paritosh R. Dave, Kathy Yang
  • Patent number: 7976654
    Abstract: 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: Grant
    Filed: July 17, 2009
    Date of Patent: July 12, 2011
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Daniel Stec, III, Gartung Cheng, Brian E. Fuchs, Gerard Gillen, Neha Mehta
  • Patent number: 7967929
    Abstract: 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: Grant
    Filed: December 28, 2009
    Date of Patent: June 28, 2011
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Daniel Stec, III, Amy Wilson, Brian E. Fuchs, Neha Mehta, Paula Cook
  • Patent number: 7964045
    Abstract: 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: Grant
    Filed: May 15, 2009
    Date of Patent: June 21, 2011
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Daniel Stec, III, Gartung Cheng, Brian E. Fuchs, Neha Mehta
  • Patent number: 7712419
    Abstract: 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: Grant
    Filed: May 11, 2007
    Date of Patent: May 11, 2010
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Gartung Cheng, Neha Mehta, Emily A. Cordaro, Gregory Papatrefon, Carl Hu, Brian Fuchs, Neelam Mehta, Kathy Yang
  • Publication number: 20100024933
    Abstract: 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: Application
    Filed: February 15, 2006
    Publication date: February 4, 2010
    Inventors: Daniel Stec, III, Gartung Cheng, Brian E. Fuchs, Gerard Gillen, Neha Mehta
  • Patent number: 7407638
    Abstract: 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: Grant
    Filed: February 28, 2005
    Date of Patent: August 5, 2008
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Andrew Perich, Emily A. Cordaro, Gartung Cheng, Neha Mehta, Daniel Stec, III
  • Patent number: 7052562
    Abstract: 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: Grant
    Filed: February 28, 2003
    Date of Patent: May 30, 2006
    Assignee: The United State of America as represented by the Secretary of the Army
    Inventors: Daniel Stec, III, Gartung Cheng, Brian E. Fuchs, Gerard Gillen, Neha Mehta