Chemistry: electrical current producing apparatus – product – and – Means externally releasing internal gas pressure from closed... – Blowout type
Reexamination Certificate
2006-01-31
2006-01-31
Ryan, Patrick Joseph (Department: 1745)
Chemistry: electrical current producing apparatus, product, and
Means externally releasing internal gas pressure from closed...
Blowout type
C429S174000, C429S206000
Reexamination Certificate
active
06991872
ABSTRACT:
An end cap seal assembly for an electrochemical cell such as an alkaline cell is disclosed. The end cap assembly comprises a convoluted end cap which may also function as a cell terminal and an underlying insulating sealing disk. The insulating sealing disk comprises a central boss and radially extending arm terminating in a downwardly sloped elbow and upwardly sloped peripheral edge. The end cap disk has at least one vent aperture therethrough which faces the ambient environment. The insulating disk has an annular groove in its top or bottom surface, which preferably circumvents the central boss. The base of the groove defines an a rupturable membrane portion of the insulating sealing disk. The rupturable membrane is designed to rupture, preferably when the cell internal gas pressure reaches a level between about 150 and 900 psig (1034×103and 6206×103pascal gage) advantageously, between about 150 and 700 psig (1034×103and 4827×103pascal gage).
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Duprey Kevin
Lindsay Thomas L.
Podoprigora Oleg
Yoppolo Robert A.
Josephs Barry D.
Krivulka Thomas G.
Parsons Thomas H.
Ryan Patrick Joseph
The Gillette Company
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