Patents by Inventor David Olaf Johnson

David Olaf Johnson 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: 12104887
    Abstract: An explosive device configured for outputting a quasi-planar shock wave includes: a body structure having a proximal end and an opposing distal end, and within which (a) an initiation device chamber; (b) a donor charge having a geometric shape correlated with first cone having an internal void exhibiting a geometric shape correlated with a second cone, wherein a first base of the first cone and a second base of the second cone reside in a common plane and have a common center point; (c) a non-explosive wave shaper filling the void; and (d) an acceptor charge are sequentially disposed adjacent to each other in a direction toward the distal end. Perpendicular to the central axis, a maximum lateral span of each of the wave shaper, the donor charge, and the acceptor charge coincide. The acceptor explosive charge mass does not laterally extend to a set of body structure outer walls.
    Type: Grant
    Filed: July 31, 2019
    Date of Patent: October 1, 2024
    Assignee: Orica International Pte Ltd
    Inventors: David Olaf Johnson, Dale S. Preece, Matthew Tolliver Rawls, Chad D. Chaffin, Ayman Tawadrous
  • Publication number: 20230417520
    Abstract: In an embodiment, a photoinitiation apparatus includes: a set of illumination sources or elements configured for outputting optical energy; a body structure having a proximal body structure portion confining a proximal volume of explosive medium, an intermediate body structure portion confining an intermediate volume of explosive medium, and a distal body structure portion confining a distal volume of explosive medium, wherein the proximal volume of explosive medium is optically coupled to portions of the first volume of explosive medium, at least one of the proximal volume of explosive medium and the distal volume of explosive medium is a tertiary explosive medium, and (a) the body structure does not carry a primary explosive composition and does not carry a secondary explosive composition, and/or (b) each of the proximal, intermediate, and distal volumes of explosive media has an initiation sensitivity that is less than cyclotrimethylenetrinitramine (RDX) based explosive compositions.
    Type: Application
    Filed: February 20, 2023
    Publication date: December 28, 2023
    Inventors: David Olaf JOHNSON, Rodney Wayne APPLEBY, Richard John GOODRIDGE, Ming Chung LEE, Francisco SANCHEZ, Matthew Tolliver RAWLS
  • Patent number: 11585643
    Abstract: In an embodiment, a photoinitiation apparatus includes: a set of illumination sources or elements configured for outputting optical energy; a body structure having a proximal body structure portion confining a proximal volume of explosive medium, an intermediate body structure portion confining an intermediate volume of explosive medium, and a distal body structure portion confining a distal volume of explosive medium, wherein the proximal volume of explosive medium is optically coupled to portions of the first volume of explosive medium, at least one of the proximal volume of explosive medium and the distal volume of explosive medium is a tertiary explosive medium, and (a) the body structure does not carry a primary explosive composition and does not carry a secondary explosive composition, and/or (b) each of the proximal, intermediate, and distal volumes of explosive media has an initiation sensitivity that is less than cyclotrimethylenetrinitramine (RDX) based explosive compositions.
    Type: Grant
    Filed: March 8, 2019
    Date of Patent: February 21, 2023
    Assignee: ORICA INTERNATIONAL PTE LTD
    Inventors: David Olaf Johnson, Rodney Wayne Appleby, Richard John Goodridge, Ming Chung Lee, Francisco Sanchez, Matthew Tolliver Rawls
  • Publication number: 20210310773
    Abstract: An explosive device configured for outputting a quasi-planar shock wave includes: a body structure having a proximal end and an opposing distal end, and within which (a) an initiation device chamber; (b) a donor charge having a geometric shape correlated with first cone having an internal void exhibiting a geometric shape correlated with a second cone, wherein a first base of the first cone and a second base of the second cone reside in a common plane and have a common center point; (c) a non-explosive wave shaper filling the void; and (d) an acceptor charge are sequentially disposed adjacent to each other in a direction toward the distal end. Perpendicular to the central axis, a maximum lateral span of each of the wave shaper, the donor charge, and the acceptor charge coincide. The acceptor explosive charge mass does not laterally extend to a set of body structure outer walls.
    Type: Application
    Filed: July 31, 2019
    Publication date: October 7, 2021
    Inventors: David Olaf Johnson, Dale S. Preece, Matthew Tolliver Rawls, Chad D. Chaffin, Ayman Tawadrous
  • Publication number: 20210003371
    Abstract: In an embodiment, a photoinitiation apparatus includes: a set of illumination sources or elements configured for outputting optical energy; a body structure having a proximal body structure portion confining a proximal volume of explosive medium, an intermediate body structure portion confining an intermediate volume of explosive medium, and a distal body structure portion confining a distal volume of explosive medium, wherein the proximal volume of explosive medium is optically coupled to portions of the first volume of explosive medium, at least one of the proximal volume of explosive medium and the distal volume of explosive medium is a tertiary explosive medium, and (a) the body structure does not carry a primary explosive composition and does not carry a secondary explosive composition, and/or (b) each of the proximal, intermediate, and distal volumes of explosive media has an initiation sensitivity that is less than cyclotrimethylenetrinitramine (RDX) based explosive compositions.
    Type: Application
    Filed: March 8, 2019
    Publication date: January 7, 2021
    Inventors: David Olaf JOHNSON, Rodney Wayne APPLEBY, Richard John GOODRIDGE, Ming Chung LEE, Francisco SANCHEZ
  • Publication number: 20200049476
    Abstract: An initiation device for initiation of an explosives charge, which comprises: a transceiver for receipt of wireless command signals; a control circuit for processing of wireless command signals received by the transceiver; and a light source that is suitable for initiation of the explosives charge and that is activated by the control circuit.
    Type: Application
    Filed: October 17, 2019
    Publication date: February 13, 2020
    Applicant: ORICA INTERNATIONAL PTE LTD.
    Inventors: Richard John GOODRIDGE, Rodney Wayne APPLEBY, David Olaf JOHNSON, Thomas M MILLER
  • Publication number: 20130098257
    Abstract: An initiation device for initiation of an explosives charge, which comprises: a transceiver for receipt of wireless command signals; a control circuit for processing of wireless command signals received by the transceiver; and a light source that is suitable for initiation of the explosives charge and that is activated by the control circuit.
    Type: Application
    Filed: May 9, 2011
    Publication date: April 25, 2013
    Applicant: ORICA INTERNATIONAL PTE LTD
    Inventors: Richard John Goodridge, Rodney Wayne Appleby, David Olaf Johnson, Thomas M. Miller
  • Patent number: 8272325
    Abstract: A detonator free blasting system, which comprises: a bulk explosive; a confined explosive; a fiber optic adapted to deliver laser light to the confined explosive, wherein the confined explosive is provided relative to the bulk explosive such that detonation of the confined explosive causes initiation of the bulk explosive.
    Type: Grant
    Filed: March 14, 2008
    Date of Patent: September 25, 2012
    Assignee: Orica Explosives Technology Pty., Ltd.
    Inventors: Richard John Goodridge, Rodney Wayne Appleby, David Olaf Johnson, Thomas Miller
  • Publication number: 20100180786
    Abstract: A detonator free blasting system, which comprises: a bulk explosive; a confined explosive; a fiber optic adapted to deliver laser light to the confined explosive, wherein the confined explosive is provided relative to the bulk explosive such that detonation of the confined explosive causes initiation of the bulk explosive.
    Type: Application
    Filed: March 14, 2008
    Publication date: July 22, 2010
    Applicant: ORICA EXPLOSIVES TECHNOLOGY PTY LTD
    Inventors: Richard John Goodridge, Rodney Wayne Appleby, David Olaf Johnson, Thomas Miller