Filter cartridge with integrated inhalation and exhalation...

Surgery – Respiratory method or device – Including body or head supported means covering user's scalp

Reexamination Certificate

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C128S205290, C128S206170

Reexamination Certificate

active

07114496

ABSTRACT:
The present invention is a filter cartridge with integrated inhalation and exhalation valves. The exhalation valve integrated into the filter cartridge prevents unfiltered air from being inhaled. The inhalation valve(s), also integrated into the filter cartridge, effectively reduces the dead space inside the filter cartridge and thereby limits re-breathing of carbon dioxide.

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patent: 5353789 (1994-10-01), Schlobohm
patent: 6736137 (2004-05-01), Resnick et al.
patent: 6860267 (2005-03-01), Capon et al.
patent: 6966318 (2005-11-01), Tsuug et al.

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