Chemistry: electrical current producing apparatus – product – and – Having specified venting – feeding or circulation structure – Venting structure
Reexamination Certificate
2006-08-22
2006-08-22
Ryan, Patrick Joseph (Department: 1745)
Chemistry: electrical current producing apparatus, product, and
Having specified venting, feeding or circulation structure
Venting structure
C429S078000, C429S179000, C429S163000
Reexamination Certificate
active
07094495
ABSTRACT:
An alkaline cell having a flat housing, preferably of cuboid shape. The cell can have an anode comprising zinc and a cathode comprising MnO2. The housing can have a relatively small overall thickness, typically between about 5 and 10 mm. Cell contents can be supplied through an open end in the housing and an end cap assembly inserted therein to seal the cell. The end cap assembly includes a vent mechanism which can activate, when gas pressure within the cell reaches a threshold level typically between about 100 and 300 psig (6.89×105and 20.69×105pascal gage). The cell can have primary and supplemental vent mechanisms such as welded or thinned regions on the surface of the housing which may activate at different pressure levels. The cathode can be formed of a plurality of stacked slabs having aligned hollow centers with an elongated opening for anode material to be inserted therein.
REFERENCES:
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patent: 5586993 (1996-12-01), Saito
patent: 5665483 (1997-09-01), Saito
patent: 6081992 (2000-07-01), Kelemen et al.
patent: 6248472 (2001-06-01), Kelemen
patent: 6521372 (2003-02-01), Urry
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patent: WO 00/02278 (2000-01-01), None
Anglin David
Ashbolt Mark
Malgioglio Anthony
Shelekhin Alexander
Specht Steven J.
Josephs Barry D.
Krivulka Thomas G.
Lewis Ben
Ryan Patrick Joseph
The Gillette Company
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