Self-sealing protection filter port

Details Self-sealing protection filter port Self-sealing protection filter port

2006-09-05

2006-09-05

Greene, Jason M. (Department: 1724)

Gas separation

With means securing or retaining separating media

Unit or cohesive sheet-like media in flow line or frame

C055S385100, C055S417000, C055S418000, C055S420000, C055SDIG035, C210S234000, C210S235000

Reexamination Certificate

active

07101412

ABSTRACT:
A self-sealing protection filter port for gas masks prevents contamination of the inner-environment of the mask during exchange of filters and therefore increases safety. A biased valve closes the air inlet to the port when the protection filter is not installed. As a new filter is inserted, the valve is forced open, allowing filtered air to flow through the air inlet to the user. The protection filter engages the filter port using a retaining element. The self-sealing protection filter in a protection mask having an internal close-biased valve is installed in the standard protection filter port of the mask.

REFERENCES:
patent: 3715032 (1973-02-01), Nicko
patent: 3852196 (1974-12-01), Szpur
patent: 4529514 (1985-07-01), Gruett
patent: 4682993 (1987-07-01), Todd et al.
patent: 5914037 (1999-06-01), Yen
patent: 42 41 033 (1994-06-01), None

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