Drug – bio-affecting and body treating compositions – Dentifrices – Phosphate compound containing
Patent
1989-01-19
1990-08-28
Kalafut, Stephen J.
Drug, bio-affecting and body treating compositions
Dentifrices
Phosphate compound containing
429104, H01M 1034, H01M 436
Patent
active
049524640
ABSTRACT:
A sodium sulfur electrical storage cell includes means for avoiding bubbles in the sulfur cathode during operation in a weightless environment. Formation of bubbles of sulfur or other gas in the cathode is prevented by pressurizing the sulfur cathode to a pressure greater than the vapor pressure of the sulfur at the operating temperature, typically about 350 C. The applied pressure is preferably supplied by a chemical compound, such as sodium azide, that is placed into the chamber holding the sulfur. At the operating temperature of the cell, the compound decomposes to produce a gas, nitrogen in the case of the sodium azide, that is substantially insoluble in the sulfur yet produces a sufficiently high pressure over the liquid sulfur that bubbles of gaseous sulfur or other gases cannot form in the sulfur. If bubbles were permitted to form in a weightless environment, they would migrate to a location where they would interfere with the operation of the cell.
REFERENCES:
patent: 4006281 (1977-02-01), Markin et al.
patent: 4167807 (1979-09-01), Verity
Rogers Howard H.
Sernka Richard P.
Stadnick Steven J.
Denson-Low W. K.
Hughes Aircraft Company
Kalafut Stephen J.
Mitchell Steven M.
Westerlund Robert A.
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