Patents by Inventor Alexander S. Tappan

Alexander S. Tappan 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).

  • Explosive device comprising an explosive material having controlled explosive properties
    Patent number: 11673844
    Abstract: An explosive device is described herein, wherein the explosive device includes a substrate that has a surface, wherein surface energy of a portion of the surface of the substrate has been modified in a vacuum chamber from a first surface energy to a second surface energy. The explosive device additionally includes explosive material that has been deposited on the surface of the substrate in the vacuum chamber by way of physical vapor deposition (PVD), wherein the explosive material is deposited on the portion of the surface of the substrate subsequent to the surface energy of the portion of the surface of the substrate being modified from the first surface energy to the second surface energy.
    Type: Grant
    Filed: May 5, 2022
    Date of Patent: June 13, 2023
    Assignee: National Technology & Engineering Solutions of Sandia, LLC
    Inventors: Eric Christopher Forrest, Robert Knepper, Alexander S. Tappan, Michael P. Marquez
  • EXPLOSIVE DEVICE COMPRISING AN EXPLOSIVE MATERIAL HAVING CONTROLLED EXPLOSIVE PROPERTIES
    Publication number: 20220289642
    Abstract: An explosive device is described herein, wherein the explosive device includes a substrate that has a surface, wherein surface energy of a portion of the surface of the substrate has been modified in a vacuum chamber from a first surface energy to a second surface energy. The explosive device additionally includes explosive material that has been deposited on the surface of the substrate in the vacuum chamber by way of physical vapor deposition (PVD), wherein the explosive material is deposited on the portion of the surface of the substrate subsequent to the surface energy of the portion of the surface of the substrate being modified from the first surface energy to the second surface energy.
    Type: Application
    Filed: May 5, 2022
    Publication date: September 15, 2022
    Inventors: Eric Christopher Forrest, Robert Knepper, Alexander S. Tappan, Michael P. Marquez
  • Explosive device comprising an explosive material having controlled explosive properties
    Patent number: 11358910
    Abstract: An explosive device is described herein, wherein the explosive device includes a substrate that has a surface, wherein surface energy of a portion of the surface of the substrate has been modified in a vacuum chamber from a first surface energy to a second surface energy. The explosive device additionally includes explosive material that has been deposited on the surface of the substrate in the vacuum chamber by way of physical vapor deposition (PVD), wherein the explosive material is deposited on the portion of the surface of the substrate subsequent to the surface energy of the portion of the surface of the substrate being modified from the first surface energy to the second surface energy.
    Type: Grant
    Filed: November 12, 2018
    Date of Patent: June 14, 2022
    Assignee: National Technology & Engineering Solutions of Sandia, LLC
    Inventors: Eric Christopher Forrest, Robert Knepper, Alexander S. Tappan, Michael P. Marquez
  • Nanocomposite thermite ink
    Patent number: 8048242
    Abstract: A nanocomposite thermite ink for use in inkjet, screen, and gravure printing. Embodiments of this invention do not require separation of the fuel and oxidizer constituents prior to application of the ink to the printed substrate.
    Type: Grant
    Filed: April 5, 2007
    Date of Patent: November 1, 2011
    Assignee: Sandia Corporation
    Inventors: Alexander S. Tappan, Joseph Cesarano, III, John N. Stuecker
  • Ultrashort-pulse laser generated nanoparticles of energetic materials
    Patent number: 7767931
    Abstract: A process for generating nanoscale particles of energetic materials, such as explosive materials, using ultrashort-pulse laser irradiation. The use of ultrashort laser pulses in embodiments of this invention enables one to generate particles by laser ablation that retain the chemical identity of the starting material while avoiding ignition, deflagration, and detonation of the explosive material.
    Type: Grant
    Filed: June 12, 2007
    Date of Patent: August 3, 2010
    Assignee: Sandia Corporation
    Inventors: Eric J. Welle, Alexander S. Tappan, Jeremy A. Palmer