Patents by Inventor Andrew G. Pearsall

Andrew G. Pearsall 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