Patent 8011643 was granted and assigned to Environmental Dynamics International on September, 2011 by the United States Patent and Trademark Office.
A diffuser assembly with a buoyancy vessel and a chamber for buoyantly raising the diffuser assembly for maintenance work. The diffuser assembly has a support structure, diffusers connected to the frame, and a buoyancy vessel positioned on the frame, capable of alternating between a state of buoyancy or ballast.