Patents Assigned to Richard John Johnson
  • Electro-optical detonator
    Patent number: 5101727
    Abstract: The invention relates to an Optical Detonator including a provision to accept a fiberoptic light guide cable 2 within a terminal socket 12 whereby an electromagnetic radiation signal passed down the fiberoptic light guide cable 2 activates a photo-conductor device 16 located within the hollow body portion 3 of the detonator 1 to allow an adjacent primary battery device 20 as the electrical energizing source to pass an electric current through fusehead 7/8 to fire the detonator.
    Type: Grant
    Filed: December 5, 1990
    Date of Patent: April 7, 1992
    Assignee: Richard John Johnson
    Inventor: Arthur G. Yarrington