Coin cell protection against reverse insertion in cell holder

Details Coin cell protection against reverse insertion in cell holder Coin cell protection against reverse insertion in cell holder

2006-10-10

2006-10-10

Maples, John S. (Department: 1745)

Chemistry: electrical current producing apparatus, product, and

Having polarity safety feature

C429S096000, C429S100000, C429S164000, C429S174000

Reexamination Certificate

active

07118817

ABSTRACT:
A method and associated apparatus for preventing applying a reverse polarity voltage to an electronic circuit from a coin cell used to power such circuit by providing a first insulating wafer over the top conductive surface of a coin cell and a second insulating wafer over the bottom conductive surface of the cell. The first wafer has a central opening and the second wafer is designed to cover the portion of the bottom conductive surface corresponding to the opening of the first wafer so that when the two wafers of the protection system are placed over the coin cell with the first wafer and the insulating area positioned on the top and bottom conductive surfaces respectively, the insulating area extends fully under the first opening.

REFERENCES:
patent: 4053688 (1977-10-01), Perkins et al.
patent: 4087595 (1978-05-01), P. R. Mallory and Co. Inc.
patent: 4487820 (1984-12-01), Engelstein et al.
patent: 4535036 (1985-08-01), Kelm et al.
patent: 5922489 (1999-07-01), Adachi
patent: 5931693 (1999-08-01), Yamazaki
patent: 6062901 (2000-05-01), Liu et al.
patent: 6205034 (2001-03-01), Zayatz
patent: 6527584 (2003-03-01), Ninomiya
patent: 2004/0038585 (2004-02-01), Sugimoto et al.

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