Breathing apparatus for underwater use

Claim 1

A tank for underwater use of the type adapted to be pressurized with a breathable gas and depressurized underwater to provide the gas to a user, said tank comprising: a container defining a chamber and having a first and second aperture communicating with said chamber; a pressure regulating means removably secured to said container and having a portion extending axially into said first aperture, said pressure regulating means further comprising a filter secured to said portion and extending axially into said chamber whereby said filter is removed from said chamber through said first aperture upon the removal of said pressure regulating means; a liner coated onto the surface of said chamber to protect said tank from corrosion whereby the liner adheres to the surface of the chamber; said chamber being completely filled with a gas and liquid adsorbent material insertable into said container through said second aperture whereby said material both adsorbs corrosive liquids from said chamber and permits the storage of a greater amount of gas within the chamber than without the material, wherein said material is firmly packed into said chamber to prevent floating dust particles of said material whereby said material holds said liner onto the surface of the chamber upon a rapid decompression of the tank, and wherein said material has greater heat transfer properties than the gas so that said material transfers heat to said tank upon rapid compression of said tank; and means for sealing said second aperture.