Surgery – Respiratory method or device – Face mask covering a breathing passage
Reexamination Certificate
2005-10-25
2005-10-25
Dawson, Glenn K. (Department: 3731)
Surgery
Respiratory method or device
Face mask covering a breathing passage
C128S206240, C128S207110
Reexamination Certificate
active
06957653
ABSTRACT:
Improved full-face, flushed-seal respirators are provided having a primary sealing element adjacent to a breathing space and a secondary sealing element. Exhaled air (i.e., clean air obtained by passage through a filtering element or elements) is passed from the breathing space into a flushing channel formed between the primary and secondary seals. If there is leakage in the primary seal, air from this flushing channel leaks into the breathing space rather than ambient air. Air within the flushing channel will predominately be air that has already passed through the filtering elements. The present invention provides, therefore, an inexpensive respirator which provides significantly more protection than conventional negative-pressure respirators.
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Campbell Donald L.
Coffey Christopher C.
Hoffman William A.
Hudnall Judith B.
Dawson Glenn K.
Erezo Darwin P
Klarquist & Sparkman, LLP
The United States of America as represented by the Secretary of
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