Patents by Inventor John J. Ridgeway

John J. Ridgeway 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).

  • Shaped explosive charge device for under water use
    Patent number: 4160413
    Abstract: In the use of a shaped explosive charge device underwater, the stand-off and cavity chamber are filled with compressed gas which is fed into the chamber to expel water through one or more apertures communicating with the surrounding water. Conveniently the apertures remain open and the compressed gas is entrapped and maintained within the device by the ambient hydrostatic pressure.
    Type: Grant
    Filed: September 21, 1977
    Date of Patent: July 10, 1979
    Assignee: Imperial Chemical Industries Limited
    Inventor: John J. Ridgeway
  • Shaped explosive charge device for underwater use
    Patent number: 4151798
    Abstract: A shaped explosive charge device for underwater use wherein a deflated inflatable element is positioned within the stand-off space and, when the device is in position for firing, for example, as an inside cutter, the inflatable element is inflated to exclude water from the cavity and stand-off space between the explosive charge and the target surface.
    Type: Grant
    Filed: September 26, 1977
    Date of Patent: May 1, 1979
    Assignee: Imperial Chemical Industries Limited
    Inventor: John J. Ridgeway