Surgery – Respiratory method or device – Means for keeping viewing member clear
Reexamination Certificate
2006-03-21
2006-03-21
Dawson, Glenn K. (Department: 3731)
Surgery
Respiratory method or device
Means for keeping viewing member clear
C128S206120, C128S206220, C128S206230, C128S206240
Reexamination Certificate
active
07013891
ABSTRACT:
A respirator (1) comprises an inner, oronasal, mask (2) enclosed within an outer, face sealing, mask (3) so as to define a cavity (4) therewith, a screw-threaded air inlet (5) for conducting inhaling air to the interior of the inner mask (2), a filter canister (7) for filtering the inhaling air, and an air outlet (8) for conducting exhaled air from the interior (6) of the inner mask (2). In normal operation, air is inhaled and exhaled solely through the inner mask (2) and so substantially no air pressure differential exists between the ambient atmosphere (9) and the cavity (4) which will allow ambient air to enter the cavity.
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Mathers William George
Richardson Grant Stuart
Crall Kristin M.
Dawson Glenn K.
Kilpatrick & Stockton LLP
Russell Dean W.
The Secretary of State for Defense in Her Britannic Majesty's Go
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