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Heating apparatus

US-8443793-B2

Abstract

A heating apparatus includes an elongated flexible envelope ( 4 ) comprising two sheets ( 6 ), ( 8 ) that are attached to each other along permanent side seams ( 10 ), ( 12 ) and along a permanent bottom seam ( 14 ) and a moisture-activated chemical heater ( 16 ) disposed inside envelope ( 4 ), wherein envelope ( 4 ) is folded over on itself and secured by temporary side seams ( 18 ), ( 20 ) and a permanent top seam ( 22 ) to form a continuous moisture barrier surrounding the moisture activated chemical heater ( 16 ) and wherein heater ( 2 ) may be opened for use by removing top seam ( 22 ) and unfolding envelope ( 4 ) by unpeeling temporary seals ( 18 ), ( 20 ) to provide unfolded envelope ( 4 ), wherein sheets ( 6 ) and ( 8 ) remain sealed along permanent seams ( 10 ), ( 12 ) and ( 14 ), but wherein envelope ( 4 ) now has an open top end ( 30 ).

Patent figures（8）

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Source status & events

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