Patents Assigned to Institution pour le Developpement de la Gazeification Souterraine
  • Controlled retracting gasifying agent injection point process for UCG sites
    Patent number: 4754811
    Abstract: New controlled retracting gasifying agent injection point process for UCG sites.The process consists of a retraction of the gasifying agent injection point achieved by gradually plugging the tubing ends either by pneumatic injection of inert granulated material with a thermosetting binder, or by closing valves set at regular intervals inside the tubings.
    Type: Grant
    Filed: August 24, 1987
    Date of Patent: July 5, 1988
    Assignee: Institution pour le Developpement de la Gazeification Souterraine
    Inventors: Pierre Ledent, Claus Sonntag
  • Controlled retracting gasifying agent injection point process for UCG sites
    Patent number: 4705109
    Abstract: The process consists of a retraction of the gasifying agent injection point achieved by gradually plugging the tubing ends either by pneumatic injection of inert granulated material with a thermosetting binder, or by closing valves set at regular intervals inside the tubings.
    Type: Grant
    Filed: February 27, 1986
    Date of Patent: November 10, 1987
    Assignee: Institution pour le Developpement de la Gazeification Souterraine
    Inventors: Pierre Ledent, Claus Sonntag