Patents by Inventor Paritosh R. Dave

Paritosh R. Dave 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: 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: 7304164
    Abstract: 1-Methyl-2,4,5-Trinitroimidazole is synthesized starting from 4-nitroimidazole using stepwise nitration method and further methylation using Dimethylsulphate. It is relatively insensitive to impact and its thermal stability is excellent. The calculated detonation properties indicate that its performance is about 30% better than TATB. It can be prepared easily, with reasonable yield, starting from commercially available Imidazole. Results from impact sensitivity, friction sensitivity, time-to-explosion temperature and vacuum stability tests indicate that it is less sensitive than both RDX and HMX. The good oxygen balance and measured heat of formation data of this material indicate that its propellant performance should be good.
    Type: Grant
    Filed: October 13, 2006
    Date of Patent: December 4, 2007
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Reddy Damavarapu, C. Rao Surapaneni, Nathaniel Gelber, Raja G. Duddu, MaoXi Zhang, Paritosh R. Dave
  • Patent number: 7109359
    Abstract: The invention relates to a novel polyazido compound: 2,2-dinitro-1,3-diazidopropane.
    Type: Grant
    Filed: August 15, 2003
    Date of Patent: September 19, 2006
    Assignee: The United States of America represented by the Secretary of the Army
    Inventors: Paritosh R. Dave, Raja G. Duddu, Reddy Damavarapu, Nathaniel Gelber, Kathy Yang, C. Rao Surapaneni
  • Patent number: 6998485
    Abstract: The compound 3a,8a-bis-azidomethyl-3a,4,8a,9-tetrahydro-3H,8H-bis-[1,2,3]triazolo[1,5-a;1?,5?-d]pyrazine, whose structure is depicted below, is disclosed:
    Type: Grant
    Filed: August 15, 2003
    Date of Patent: February 14, 2006
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Paritosh R. Dave, Raja G. Duddu, Reddy Damavarapu, Nathaniel Gelber, Kathy Yang, C. Rao Surapaneni
  • Patent number: 6965042
    Abstract: The compound 2,2-bis(azidomethyl)oxirane, whose structure is depicted below, is disclosed:
    Type: Grant
    Filed: August 15, 2003
    Date of Patent: November 15, 2005
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Paritosh R. Dave, Raja G. Duddu, Nathaniel Gelber, Kathy Yang, C. Rao Surapaneni, Reddy Damavarapu
  • Patent number: 6841690
    Abstract: This invention relates to a series of novel compounds having the general structures A and B: including 2-azido-2-azidomethyl-1,3-diazidopropane (1), 2-azidomethyl-2-hydroxy-1,3-diazidopropane (2), 2-azidomethyl-2-nitrato-1,3-diazidopropane (3), 2-azidomethyl-2-nitro-1,3-diazidopropane (4), 2,2-dinitro-1,3-diazidopropane (5), methallyidiazide (6), a dimer of methallyidiazide (6), comprising 3a,8a-Bis-azidomethyl-3a,4,8a,9-tetrahydro-3H,8H-bis[1,2,3]triazolo[1,5-a;1?,5?-d]pyrazine (6-Dimer), 1,3-diazidoacetone (7), and 2-Oximido-1,3-diazidopropane (8). Also shown are reaction intermediates of these compounds, including 2,2-bis(chloromethyl)oxirane (9), and 2,2-bis(azidomethyl)oxirane (10).
    Type: Grant
    Filed: August 15, 2003
    Date of Patent: January 11, 2005
    Assignee: The United States of America, as represented by the Secretary of the Army
    Inventors: Paritosh R. Dave, Raja G. Duddu, Reddy Damavarapu, Nathaniel Gelber, Kathy Yang, C. Rao Surapaneni
  • Patent number: 6417373
    Abstract: New aza azetidinium sulfate compounds are described which can be intermediates in the preparation of azabicyclobutane.
    Type: Grant
    Filed: October 19, 1998
    Date of Patent: July 9, 2002
    Assignee: The United States of America as represented by Secretary of Army
    Inventors: Paritosh R. Dave, Thomas G. Archibald
  • Patent number: 6232479
    Abstract: A novel cyclotetraphosphazene compound, 1,1-diamino-3,3,5,5,7,7-hexaazidocyclotetraphosphazene, is disclosed which has application as an energetic compound and percussion primer. Also disclosed is a method of preparing the compound.
    Type: Grant
    Filed: August 15, 2000
    Date of Patent: May 15, 2001
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Farhad Forohar, Paritosh R. Dave, Sury Iyer
  • Patent number: 6218554
    Abstract: A novel cyclotetraphosphazene compound, 1,5-diamino-1,3,3,5,7,7-hexaazidocyclotetraphosphazene, is disclosed which has application as an energetic compound. Also disclosed is a method of preparing the compound.
    Type: Grant
    Filed: September 15, 2000
    Date of Patent: April 17, 2001
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Farhad Forohar, Paritosh R. Dave, Sury Iyer
  • Patent number: 6160113
    Abstract: Processes and compositions for nitration of N-substituted isowurtzitane compounds with concentrated nitric acid at elevated temperatures to form HNIW and recovery thereof with high yields and purities. Polymorphic conversions to the epsilon HNIW crystal form at quanititative yields are also described.
    Type: Grant
    Filed: April 28, 1999
    Date of Patent: December 12, 2000
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Raja Duddu, Paritosh R. Dave
  • Patent number: 6015898
    Abstract: Processes and compositions for nitration of N-substituted isowurtzitane compounds with concentrated nitric acid at elevated temperatures to form HNIW and recovery of gamma HNIW with high yields and purities. Polymorphic conversion of HNIW crystals to epsilon HNIW crystals is also disclosed.
    Type: Grant
    Filed: May 1, 1998
    Date of Patent: January 18, 2000
    Assignee: The United States of America, as represented by the Secretary of the Army
    Inventors: Raja G. Duddu, Paritosh R. Dave
  • Patent number: 5831099
    Abstract: Overall, the invention provides the chemistry for the compounds and for the processes to prepare compounds derived from 1,5-diazacyclooctanes. This makes available high density, high melting point, thermally stable small and medium ring nitrogen heterocycles that may also contain N-nitro, C-nitro or other functional groups. The compounds include cyclooctanes, bicyclo octanes, propellanes and functionalized derivatives of the above compounds. The preparations can include transannular cyclizations. The materials have several applications; e.g., the polynitro compounds are energetic materials.
    Type: Grant
    Filed: March 31, 1998
    Date of Patent: November 3, 1998
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Paritosh R. Dave, Theodore Axenrod, Farhad Forohar
  • Patent number: 5824807
    Abstract: Azabicylobutane can be produced by reacting azetidines under aqueous conditions to eliminate aza and 3-position substituents to effect cyclization. New azetidinyl compounds are described which can be intermediates in the preparation of the azabicyclobutane.
    Type: Grant
    Filed: May 15, 1995
    Date of Patent: October 20, 1998
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Paritosh R. Dave, Thomas G. Archibald
  • Patent number: 5824806
    Abstract: TNAZ can be prepared directly from N-tertiarybutyl-3,3-dinitroazetidine compounds. The compounds may be in the form of the tertiary amine or the quaternary amine. The reaction is in the presence of acetic anhydride and nitrate ions. It gives high yields and uses mild conditions.
    Type: Grant
    Filed: May 15, 1995
    Date of Patent: October 20, 1998
    Assignee: The United States of America as represented by the The Secretary of the Army
    Inventors: Daniel Stec, III, Ralph L. Perez, Paritosh R. Dave, Thomas G. Archibald
  • Patent number: 5808099
    Abstract: ADNAZ, N-acetyl, 3,3 dinitroazetidine, is a new compound and this invention provides the compound, its compositions, preparation and uses. As a compound, it forms a eutectic with TNAZ. It can be used to prepare other compounds. It can be readily nitrated to remove the acetyl group and form TNAZ.
    Type: Grant
    Filed: May 15, 1995
    Date of Patent: September 15, 1998
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Daniel Stec, III, Paritosh R. Dave
  • Patent number: 5580988
    Abstract: New N-nitro, 3 substituted azetidine compounds are disclosed and these are sed in processes to prepare TNAZ.
    Type: Grant
    Filed: May 15, 1995
    Date of Patent: December 3, 1996
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Paritosh R. Dave
  • Patent number: 5476951
    Abstract: Method of synthesizing a 1,3,3 trinitroazetidine compound (TNAZ) comprising the steps of:selecting a compound of the formula I: ##STR1## wherein R' is one of hydrogen and an organic group and R is selected from the group consisting of electron withdrawing and electron donating groups; and,reacting the selected compound with a nitrolyzing agent such that a TNAZ compound is formed from the reaction.
    Type: Grant
    Filed: May 26, 1993
    Date of Patent: December 19, 1995
    Inventors: Paritosh R. Dave, Theodore Axenrod
  • Patent number: 5352829
    Abstract: Energetic nitramine containing cyclotriphosphazene which include 1,1,3,3,-tris-spiro(N,N'-dinitroethylenediamino)cyclotriphosphazene, 1,1-spiro(ethylenediamino)-3,3,5,5-bis-spiro(N,N'-dinitroethylenediamino)c yclotriphosphazene, 1,1,3,3-bis-spiro(N,N'-dinitroethylenediamino)-5,5-dichlorocyclotriphospha zene, 1,1,3,3-bis-spiro(N,N'-dinitroethylenediamino)-5,5-difluorocyclotriphospha zene, 1,1-spiro(N,N'-dinitroethylenediamino)-3,3,5,5-bis-spiro(ethylenediamino)c yclotriphosphazene, 1,1-spiro(ethylenediamino)-3,3-spiro(N,N'-dinitroethylenediamino)-5,5-dich lorocyclotriphosphazene, 1,1-spiro(ethylenediamino)-3,3-spiro(N,N'-dinitroethylenediamino)-5,5-difl uorocyclotriphosphazene, 1,1-spiro(N,N'-dinitroethylenediamino)-3,3,5,5-tetrachlorocyclotriphosphaz ene, and 1,1-spiro(N,N'-dinitroethylenediamino)-3,3,5,5-tetrafluorocyclotriphosphaz ene, which can be used in explosive compositions.
    Type: Grant
    Filed: April 2, 1993
    Date of Patent: October 4, 1994
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Paritosh R. Dave, Farhad Forohar, Michael Chaykovsky, Clifford D. Bedford
  • Patent number: 5292959
    Abstract: 4,4-Dinitroadamantane-2,6-dione,6, and a method of making the same.
    Type: Grant
    Filed: May 4, 1992
    Date of Patent: March 8, 1994
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Paritosh R. Dave