Cold weather breathing mask
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United States of America Patent
Stats
-
Mar 6, 1990
Grant Date -
N/A
app pub date -
Jan 12, 1988
filing date -
Jan 12, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A lightweight face mask for heating surrounding air to be inhaled by a user includes a thin cup-shaped inner shell and an outer shell spaced from and surrounding the inner shell, the inner and outer shells defining a preheating chamber therebetween through which air passes in a counter-current flow pattern before entering a user breathing space inside the inner shell. The mask may include an electric heating element and battery power supply for additionally heating air entering the user breathing space.
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