Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
122 words
A high efficiency air filter cartridge characterized by the feature that it is for use in the helmet of a powered air respirator,said cartridge being rigid or semi-rigid and comprising: a lightweight, open-topped, trough-shaped frame having an entrance at one end for attachment to an air discharge port of a fan motor housing assembly, a filter media sealed about its periphery to close said frame, and a contaminated air plenum bounded by the inner surfaces of the bottom and side walls of said frame and the under surface of said filter media, contaminated air from said air discharge port being channeled under pressure through said contaminated air plenum and distributed under pressure to and through said filter media to provide purified air.
Claim 2
Dependent Claim
122 words
A high efficiency air filter cartridge characterized by the feature that it is for use in the helmet of a powered air respirator,said cartridge being rigid or semi-rigid and comprising: a lightweight, open-topped, trough-shaped frame having an entrance at one end for attachment to an air discharge port of a fan motor housing assembly, a filter media sealed about its periphery to close said frame, and a contaminated air plenum bounded by the inner surfaces of the bottom and side walls of said frame and the under surface of said filter media, contaminated air from said air discharge port being channeled under pressure through said contaminated air plenum and distributed under pressure to and through said filter media to provide purified air.
Claim 3
Dependent Claim
189 words
A high efficiency powered air respirator for providing filtered air to a wearer, said respirator characterized by: a hardhat and an overlying shell member secured to said hardhat and spaced therefrom to form a dome-shaped cavity between said hardhat and said shell member, a face shield assembly hingeably attached to and depending from the front of said shell member, air circulating means including a fan motor housing with an air discharge port at one end thereof, said air circulating means located in the rear portion of said dome-shaped cavity, a rigid or semi-rigid, disposable, air filter cartridge according to Claim 1 located in said dome-shaped cavity, a clean air passageway comprising the remaining space in said dome-shaped cavity, said air discharge port of said fan motor housing providing contaminated air under pressure from said air circulating means into and through said contaminated air plenum and into and through said filter media to deliver purified air to said clean air passageway, said clean air passageway having openings at one end for delivering purified air to said face shield assembly thereby providing clean air in a stream over the wearer's face.
Claim 4
Dependent Claim
17 words
The filter cartridge according to Claims 1 or 2 wherein said filter media is pleated fiberglass paper.
Claim 5
Dependent Claim
23 words
The filter cartridge according to Claim 3 wherein said pleats of said filter media are retained in pleated form by glue string spacers.
Claim 6
Dependent Claim
26 words
The filter cartridge according to Claims 3 or 4 wherein said filter media is capable of trapping at least 99.97 percent of 0.3-micrometer diameter dioctylphthalate particles.
Claim 7
Dependent Claim
19 words
The filter cartridge according to Claims 1 or 2 wherein said filter media is a sorbent particle loaded web.
Claim 8
Dependent Claim
25 words
The filter cartridge according to Claim 6 wherein said filter media is capable of providing at least 99.5 percent filtering efficiency toward CC1 4 vapors.
Claim 9
Dependent Claim
21 words
The filter cartridge according to Claims 1 or 2 wherein said filter media contains electrically charged fibers, particles, or labyrinth channels.