the respiratory mask 100 of the present invention is represented in fig1 - 5 . the respiratory mask 100 may be constructed of a suitable , flexible , substantially transparent material such as polyvinyl chloride , polyethylene , polypropylene , silicone rubbers , or other moldable materials that are non - allergenic or non - sensitizing and are suitable for the invention described . the respiratory mask 100 may also be substantially colorless in addition to being substantially transparent , or may utilize multiple colors in stylish or appealing patterns or schemes . incorporated into the respiratory mask are one - way inhalation 120 and one - way exhalation 140 valves . the relative positions of the inhalation valves may be reversed from the positions depicted in fig1 and 5 . all valves may be constructed in a similar manner . each valve may include a port 123 incorporated into the body of the respiratory mask 100 with a flexible valve flap 121 that contacts a valve seat 122 , and a way of attaching a filter cartridge such as by a bayonet - style coupling 130 , threading , snap - fitting , or other suitable connections known to those of ordinary skill in the art . the inhalation and exhalation valves may be circular , ovular , or otherwise elongated , such as an elongated oval or crescent shape extending laterally up the respiratory mask over the wearer &# 39 ; s jaw - line toward the earlobe , to conform with the goal of minimizing their relief and maximizing the respiratory mask &# 39 ; s sleek design . the flexible valve flap 121 may be circular , or otherwise elongated to conform to the shape of the valve , and connected to the rest of the valve by a pin through the center of the flexible valve flap 121 as shown in fig2 , the flexible valve flap 121 may be u - shaped such that the top of the u is secured while the rest of the u forms a seal with the valve seat 122 , or the flexible valve flap and the manner of securing the valve flap may be of any other appropriate arrangement that is known to those of ordinary skill in the art . as shown in fig2 , the flexible valve flap 121 may be supported by a spoke arrangement , a grid arrangement , or by any other suitable arrangement , many of which are known to those of ordinary skill in the art . the valve flap ( s ) 121 on the exhalation valve ( s ) 140 are seated during inhalation by the user . conversely , the valve flap ( s ) 121 on the inhalation valve ( s ) 120 are seated during exhalation by the user . the inhalation 120 and exhalation 140 valves may be located in several portions of the respiratory mask 100 . the exhalation valve ( s ) 140 may be located in a portion of the respiratory mask 100 near the user &# 39 ; s mouth to reduce respiratory condensation as depicted in fig1 , and 4 , or the exhalation valve ( s ) 140 may also be located in any portion of the respiratory mask . the exhalation valve ( s ) 140 may be disguised by a vented cover 145 as depicted in fig1 , or by a directional valve cover 220 and vent 230 as depicted in fig3 . the inhalation valve 120 may be one of several such valves incorporated into the respiratory mask . the inhalation valve 120 may be located in several positions , such as in a lateral position with respect to the exhalation valve 140 , in a substantially equidistant arrangement of two inhalation valves 120 around the exhalation valve 140 , as shown in fig1 , as a single valve in either position , as chin inhalation valves 200 located in the chin region of the respiratory mask 100 , as depicted in fig3 , or as an elongated oval or crescent shaped valve or valves 260 extending from the region covering the user &# 39 ; s chin , along the portion of the respiratory mask covering the user &# 39 ; s jaw - line toward the wearer &# 39 ; s earlobe , as shown in fig4 . a lateral position is defined as being in a position generally horizontal with respect to the exhalation valve , when the respiratory mask is in place on the face of a user . a substantially equidistant arrangement is defined as a generally symmetrical arrangement of the inhalation valves 120 about the exhalation valve ( s ) 140 . it is not an object of the present invention that the lateral position be perfectly horizontal , nor the substantially equidistant arrangement be perfectly spaced or perfectly symmetrical . the size and shape of the inhalation 120 and exhalation 140 valves can vary depending upon the overall size of the respiratory mask , user preferences , aesthetic considerations , and other factors . for example , the shape may be circular , oblong , ovular , crescent - shaped , or multi - sided . multi - sided is defined as any shape other than round or oval and includes square , rectangular , triangular , pentagonal , hexagonal , heptagonal , octagonal , or any other shape that will allow the valve to function in its intended manner , and also includes those same shapes with regular , defined corners or rounded corners . in keeping with the inconspicuous and unobtrusive nature of the invention , the respiratory mask and all valves and valve materials may be constructed of materials that are in whole or in part substantially transparent , substantially colorless , or both , or use in whole or in part a color scheme that is stylish or otherwise visually appealing . the inhalation valve ( s ) 120 may be covered by a filter cartridge 180 that locks into place over the valve . the filter cartridge 180 may attach by one of several modes such as threading , pressure - fit snapping , bayonet - style couplings , or other connections known to those of ordinary skill in the art . the filter cartridge 180 forms an airtight seal with the receiver 110 of the respiratory mask so that no inhalants are able to leak around the filter cartridge and into the respiratory system of the user . the connection site for the filter to the respiratory mask body may be located near the valve as depicted by the coupling 130 in fig1 and 2 , or the connection site may be built into the receiver as threads , snap - in - snap - out couplings , or other connections known to those of ordinary skill in the art . the filter cartridge ( s ) 180 may be as minimally sized as possible so that their physical bulk is unobtrusive , discreet , and aesthetically pleasing . the filter cartridges may have some relief from the natural curvature or surface of the respiratory mask , however that relief may be minimal relief and the minimal relief may be limited to less than 30 , 25 , 20 , 15 , 10 , 5 , 2 , or 1 millimeters from the surface of the respiratory mask body . the result is that less attention will be drawn to the user when filter cartridges of a slender or minimal relief are used . the filter medium in the cartridges may cover a wide range of materials that are well known in the art , such as simple pressed fiber filters , including felts , and layered materials including activated carbon or other materials that will sequester harmful inhalants such as particles , dust , vapors , bacteria , mists , aerosols , viruses , and gases . the filter cartridges may be replaced as the cartridges become worn or otherwise ineffective . cartridges of variable - strength filtration levels may be made to fit the valves thereby allowing a wearer to exchange cartridges depending upon the type and toxicity of inhalants intended to be protected from in a given setting or circumstance . the filtration cartridges may be made in a variety of shapes to complement the valve shape or shape of the area surrounding the valves where a sealing contact between the filter and the respiratory mask must be made . as depicted in fig3 , a series of chin inhalation valves 200 may be incorporated into the chin region of the respiratory mask 100 . the chin inhalation valves 200 may include two or more valves of the same style as the inhalation valves 120 . when only a single chin inhalation valve 200 is incorporated into the respiratory mask , the chin inhalation valve 200 may be of any shape other than circular or a disc . the size of the chin inhalation valves 200 can vary depending upon the overall size of the respiratory mask , user preferences , aesthetic considerations , and other factors . the chin inhalation valves may be elongated 260 and may include support structures 250 for the valve flaps as are known in the art and depicted in fig4 . the elongated chin inhalation valves 260 may also be merged into a single elongated valve that extends in a smile - shape or crescent - shape from the rear edge of the respiratory mask on one side , through the chin region of the respiratory mask , to the rear edge of the respiratory mask on the other side . it is also contemplated that the valves or elongated single valve may not extend fully from the chin to the region of the mask near the wearer &# 39 ; s earlobe or rear edge of the respiratory mask , but to a region of the mask in - between the chin and the rear edge . a filter 210 , or filter cartridge is then alternatively put into place over each inhalation valve 200 , or is put into place over the inhalation valve ( s ) 200 . as shown in fig6 , the filter 210 may be a single filter that covers the chin region and extends laterally up the jawline region to a point nearest the earlobe of the user . the filter 210 may be designed to protect the user against harmful inhalants such as biologic agents including viruses , bacteria , and pathogens , chemical agents including gases , mists , vapors , aerosols , and liquids , and foreign objects including particulate matter , dust , smoke , hair , small insects , dander , and pollen . both the sealing of the respiratory mask 100 and the comfort of the user may be greatly increased by the incorporation of a rolled edge 150 into the respiratory mask 100 . the rolled edge 150 is an inwardly turned , fully incorporated portion of the respiratory mask as shown in fig3 . the rolled edge 150 provides a comfortable fit of the respiratory mask on a user &# 39 ; s face , while at the same time allowing more material to form a better seal with the face . the rolled edge 150 also provides an adaptable contact area to conform to the different facial sizes and shapes of users of respiratory masks . as depicted in fig5 and 6 , the respiratory mask 100 may be held in place on the user &# 39 ; s face by a head strap 160 , a neck strap 170 , or both , or the two straps may be combined into one head harness 165 that is worn around the head in a manner that is both comfortable to the user and unobtrusive or otherwise stylish or aesthetically pleasing . the straps or head harness may be made of a comfortable soft , elastomeric material , and may cause the respiratory mask to be snug - fit to the user &# 39 ; s face with a hook and loop attachment ( i . e . velcro ®), a buckle arrangement , an alligator clip design , or other appropriate method known to those of ordinary skill in the art . the respiratory mask may also be secured to the user &# 39 ; s face with prosthetic adhesive materials available from numerous companies , and other adhesive materials known to those of skill in the art . for example , skin - bond ® from smith & amp ; nephew , ben nye prosthetic adhesive , and kryolan ® medical adhesive are but a few of the numerous adhesive materials available that are compatible with attachment of a device such as a respiratory mask to the skin of a user . the invention has been described with reference to various specific and illustrative embodiments . however , it should be understood that many variations and modifications may be made while remaining within the spirit and scope of the invention .
a half - face respiratory mask is disclosed . the respiratory mask has replaceable filters associated with inhalation valves , the filters further having a minimal relief from an outer surface of the respiratory mask . the respiratory mask may be made of a substantially transparent material , a substantially colorless material , or both , or of a aesthetically pleasing color scheme , and may be of a size , weight , and design such that the respiratory mask is physically discreet and unobtrusive to the user for everyday or active use , and is unobtrusive , discreet , or otherwise aesthetically appealing to users and passersby .