Gas emitting device

A gas emitting device comprising:

• a tubular vessel for storage of a substance to be emitted as a gas, said tubular vessel having an integral wall between its ends, dividing said vessel into first and second chambers;
• means for sealing said first chamber after introduction, in liquefied form, of the substance to be emitted;
• means defining an exit from said second chamber;
• an axial passage through said integral wall;
• a first quantity of permeable material located in said passage to provide for permeation of the substance into said second chamber, for intermediate storage in gaseous form;
• and
• a second quantity of permeable material located in said passage to provide for permeation of the substance into said second chamber, for intermediate storage in gaseous form;
• whereby the emission rate from said device is relatively insensitive to temperature variations, but may be maintained at high levels over long periods of operation because of the high storage capacity of said first chamber.

A gas emitting device, comprising:

• a tubular vessel having an integral internal wall intermediate its ends, said wall dividing said vessel into first and second chambers;
• a threaded removable seal for sealing said first chamber after the introduction, in liquefied form, of a substance to be emitted as a gas from the device;
• a threaded exit assembly forming a closure for said second chamber, and having an exit passage;
• a first quantity of permeable material positioned at said exit passage to provide emission of the substance at a predetermined rate;
• an axial passage through said integral wall between said first and second chambers;
• a second quantity of permeable material positioned in said axial passage, to allow for permeation of the substance from said first chamber to said second chamber, to replenish the supply of gaseous substance for emission;
• a first porous filter located at said exit passage, adjacent said first quantity of permeable material;
• and
• second and third porous filters located at the ends of said axial passage;
• whereby the emission rate from said device is relatively insensitive to temperature variations, but may be maintained at high levels over long periods of operation because of the high voltage capacity of said first chamber.