Patents by Inventor Paul R. Gefken

Paul R. Gefken 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: 7789982
    Abstract: A flexible dilute explosive device is provided that includes an explosive material, such as pentaerythritol tetranitrate (PETN), combined with a non-reactive matrix material, such as light-weight polymer beads, and the combination is held in flexible packaging. The flexible packaging includes fabric, antistatic, evacuated and plastic housings. The flexible dilute explosive device can be applied to any contoured shape in the field. It has a total density that is typically between 5 to 10% greater than its explosive density and can be reliably detonated at lower explosive densities. By using different packaging methods, the flexible dilute explosive device can be made to have a fixed explosive density, or a field tailored explosive density using a variable volume housing. It can have a reduced explosive density by adding inert foam blocks to the combination, having an overall volumetric explosive density reduced to 2.5 lb/ft3 (0.04 g/cm3).
    Type: Grant
    Filed: February 2, 2007
    Date of Patent: September 7, 2010
    Assignee: SRI International
    Inventors: Paul R. Gefken, Gary R. Greenfield, Robert J. Bell
  • Patent number: 7036418
    Abstract: A container for explosive devices comprising inner and outer containment vessels, each having an access port, is described. The access ports can be rotated in and out of alignment by rotating at least one of the containment vessels. The container serves to enclose, control, and suppress the explosive blast forces, biologically and/or chemically hazardous agents, and fireball resulting from detonation of an explosive device.
    Type: Grant
    Filed: August 23, 2001
    Date of Patent: May 2, 2006
    Assignee: SRI International
    Inventors: Gary Greenfield, Paul R. Gefken, James D. Colton
  • Publication number: 20030209133
    Abstract: A container for explosive devices comprising inner and outer containment vessels, each having an access port, is described. The access ports can be rotated in and out of alignment by rotating at least one of the containment vessels. The container serves to enclose, control, and suppress the explosive blast forces, biologically and/or chemically hazardous agents, and fireball resulting from detonation of an explosive device.
    Type: Application
    Filed: August 23, 2001
    Publication date: November 13, 2003
    Applicant: SRI International
    Inventors: Gary Greenfield, Paul R. Gefken, James D. Colton
  • Patent number: 6298763
    Abstract: An explosive device neutralization system includes a penetrating tip, a reaction stake, and a deployment mechanism. The reaction stake includes a reaction initiation material (R.I.M.) which is configured to burn, thereby dispersing burning R.I.M. beyond the reaction stake. The deployment mechanism and penetrating tip are configured to deliver a portion of the reaction stake adjacent to a bulk charge of the explosive device, such that the burning R.I.M. is dispersed to the bulk charge. The reaction stake includes a stake housing that encloses the R.I.M. proximate an egress hole in the stake housing. The reaction stake also includes an ignition system proximate the deployment mechanism. Upon activation of the deployment mechanism, the ignition system initiates burning of the R.I.M. The deployment mechanism can include a deployment charge that is connected to a detonator.
    Type: Grant
    Filed: January 20, 1999
    Date of Patent: October 9, 2001
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Gary R. Greenfield, Brian D. Peterson, Paul R. Gefken, Terry Henry, Steven Kirkpatrick