referring now to the embodiment of the invention shown in fig1 of the drawing , what is there illustrated is what i presently consider to be the best mode of my invention . the mask 10 of fig1 consists of three discrete portions : a central filter portion 11 adapted to be located over the mouth of the victim during mouth - to - mouth resuscitation ; a transparent portion 12 which surrounds the central portion 11 , and an exterior portion 13 , which is joined to the transparent portion and which is adapted to be grasped manually in order to locate central filter portion 11 over the mouth of the victim . as shown , portions 12 and 13 are generally oblong in shape , although they obviously can take other forms . filter portion 11 is substantially round . with respect to the central portion 11 , it is preferred that it be fibrous , and most preferably formed from cellulosic material . as shown , the central portion 11 is a dry air filter made of cellulose paper . in this form it is air - permeable , which is a requisite since the person performing the resuscitation will have to place his mouth over the central portion 11 and blow through it . while cellulose paper is the most preferred material from which the central portion 11 may be formed , it will be apparent that other materials can be used , e . g ., cotton , glass fibers and other synthetic materials . in addition , the air filter can be what is known as a viscous impingement filter , in which at least one surface portion is coated with a liquid , such as an antiseptic solution . the presence of such a liquid , particularly if it has adhesive qualities , can greatly assist in removing unsanitary materials from the breaths of both parties . the transparent portion 12 is , as categorized , one in which the resuscitator can easily view the face of the victim , or at least that much of the face as will enable him to locate the mouth of the victim and place the air - permeable filter portion 11 over the victim &# 39 ; s mouth . transparent portion 12 is normally formed from a synthetic film , and i prefer to use a composition marketed under the trademark saran , which is polyvinylidene chloride . transparent portions can be formed from other films , such as synthetic polyester resins and vinyl resins . stiffening member 13 is , as will be apparent , formed from a material that is relatively stiff yet resilient . i prefer that this material be celluloid , although many other materials , such as organic esters of cellulose , will be suitable . if celluloid is used , the stiffening portion 13 will be translucent or transparent , according to the thickness of the portion . the more transparent it is , the more it will serve as an adjunct to . the transparent portion 12 in locating the mouth of the victim . still another embodiment of my invention is shown in fig2 and 3 . here the mask 15 has a central portion 16 , which is substantially the same as the central portion 11 of the mask 10 of fig1 . yet the embodiment of fig2 and 3 employs a stiffening member 17 which is also transparent . thus , stiffening member 17 in this embodiment performs the function of both the transparent portion 12 and stiffening portion 13 of the fig1 embodiment . it is most advantageously formed from celluloid or like relatively stiff yet flexible and resilient , transparent material . as shown in fig3 the fig2 mask may be of concavo - convex form , in which it may more easily conform to the shape of the victim &# 39 ; s face . this shape is also that preferred for the fig1 embodiment ; so long as the mask is generally flexible in order to conform to a victim &# 39 ; s facial contour , it may be either flat or concavo - convex . in use , the mask of fig1 or 2 is grasped at either stiffening members 13 or 17 and , because portions 12 and 17 are substantially transparent , masks 10 and 15 are located so that central portions 11 and 16 are positioned at the mouth of the victim . then resuscitation is applied in a normal manner , with the fingers of one hand of the resuscitator closing off the nasal passageway of the victim . by the use of the mask of the present invention , however , the transfer of bacteria , viruses and other unsanitary animal or vegetable matter is greatly inhibited from passing between the mouths of the victim and the resuscitator . it will be apparent to those of skill in this art that many modifications and alterations may be made in the preferred embodiments of my invention as described hereinbefore . as to all those such obvious modifications and alterations , it is desired that they be included within the purview of my invention , which is to be limited only by the scope , including equivalents , of the following , appended claims .
a mask adapted to be placed over the mouth of a subject during mouth - to - mouth resuscitation includes a fibrous , central , air - permeable filter portion , a transparent portion surrounding the filter portion , and a stiffening portion surrounding the transparent portion , so that the mask may be grasped by the stiffening portion and visually adjusted through the transparent portion to locate the filter portion over the mouth of the subject .