Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
170 words
An escape filter device, for engagement over the head of a wearer, comprising a protective hood made of a transparent foil material engageable on the wearer's head and having an opening in an area adapted to overlie the wearer's mouth, an external strap fixed to said hood and extending around the front of the hood over the mouth area and below the area of the wearer's nose, a respiratory filter arranged outside the hood and having an air passage connecting piece extending through the opening of said protective hood to the inside and terminating in the mouthpiece adapted to engage in the mouth of the wearer, a nose pad carried by said hood on its interior directly adjacent the opening in a position disposed below the nose of the wearer and underlying said strap, said strap having ends external of said hood which may be placed around said hood and tied in the back of the wearer's neck, whereby, to compress said nose pad into engagement with the wearer's nose.
Claim 2
Dependent Claim
170 words
An escape filter device, for engagement over the head of a wearer, comprising a protective hood made of a transparent foil material engageable on the wearer's head and having an opening in an area adapted to overlie the wearer's mouth, an external strap fixed to said hood and extending around the front of the hood over the mouth area and below the area of the wearer's nose, a respiratory filter arranged outside the hood and having an air passage connecting piece extending through the opening of said protective hood to the inside and terminating in the mouthpiece adapted to engage in the mouth of the wearer, a nose pad carried by said hood on its interior directly adjacent the opening in a position disposed below the nose of the wearer and underlying said strap, said strap having ends external of said hood which may be placed around said hood and tied in the back of the wearer's neck, whereby, to compress said nose pad into engagement with the wearer's nose.
Claim 3
Dependent Claim
19 words
An escape filter device, according to claim 1, wherein said protective hood is made of a heat-resistant, non-flammable material.
Claim 4
Dependent Claim
21 words
An escape filter device, according to claim 1, wherein said filter includes an exhaling valve located outside of said protective hood.
Claim 5
Dependent Claim
17 words
An escape filter device, according to claim 1, wherein said air filter comprises a carbon monoxide filter.
Claim 6
Dependent Claim
35 words
An escape filter device, according to claim 1, including a plug secured in the mouthpiece of said filter and means for automatically removing said plug prior to its insertion on the head of a wearer.
Claim 7
Dependent Claim
46 words
An escape filter device, according to claim 5, wherein said hood constitutes a casing for containing said filter when not in use, said hood having a backwall wall connected to said plug, said plug being retained by said back wall when said filter is removed therefrom.