Surgery – Respiratory method or device – Means for removing substance from respiratory gas
Reexamination Certificate
2001-11-01
2003-03-04
Lewis, Aaron J. (Department: 3761)
Surgery
Respiratory method or device
Means for removing substance from respiratory gas
C128S201170, C002S206000
Reexamination Certificate
active
06526975
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a disposable gas mask usable for emergency rescue purposes to save human lives from toxic gas, fire-smoke or germ attack.
2. Description of the Related Art
Although conventional gas masks are well developed technically, they still have various limitations to be widely generalized to the public. In particular, conventional masks have an inefficiency in portability and storability and production cost.
Therefore, it has been strongly required to provide a gas mask which has a small size to be easily portable while being disposable, and includes a filter provided with an increased contact length and area and adapted to remove toxic materials from air.
SUMMARY OF THE INVENTION
The present invention has been made in view of the above mentioned requirement, and an object of the invention is to provide a portable, disposable gas mask which can be distributed for individuals or installed for emergency rescue on places where potential danger exists, while being capable of having a special type selected from several types for protecting a user against specific hazardous occasions, instead of bulky multi-purpose type.
In accordance with the present invention, this object is accomplished by providing a disposable gas mask comprising: a rectangular thin body; an eye protection window arranged at an upper portion of the body; a flat type filter unit arranged at a lower portion of the body; a peripheral adhesive band formed at an inner surface of the body along a peripheral edge of the body while surrounding the eye protection window and the filter unit; a vertically-extending folding line centrally provided at the eye protection window; an indicator arranged between the eye protection window and the filter unit and adapted to indicate the application purpose of the gas mask; and a sealing wax band formed at an inner surface of the eye protection window and an inner surface of the filter unit inside the adhesive band along a peripheral edge of the eye protection window and a peripheral edge of the filter unit.
The filter unit may comprises: an outer film having a plurality of uniformly spaced corrugations protruded inwardly from the body; an inner film having a plurality of uniformly spaced corrugations protruded outwardly from the body while alternating with the corrugations of the outer film, the inner film being divided into two portions; and a filter pad interposed between the outer and inner films, the filter pad having a plurality of filters interposed between the corrugations of the outer film and the corrugations of the inner film and arranged along two vertical lines so that they are grouped into two sets respectively covered by the portions of the inner film, each of the filters having a square cross section while being opened to the atmosphere at one end thereof and to the inside of the gas mask at the other end thereof to define a passage for inhaled gas, whereby ambient air is guided from opposite outer ends of the filter pad to inner ends of the filter pad arranged at a central portion of the gas mask.
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Ladas & Parry
Lewis Aaron J.
Mitchell Teena
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