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 Title: |
US3736928:
COLLAPSIBLE FACE MASK
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| Country: |
US United States of America
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| Inventor: |
Andersson, Erik Arne; 111 57 Stockholm, Sweden
Andersson, Bror Axwl Erling; 111 57 Stockholm, Sweden
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| Assignee: |
None
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| Published / Filed: |
1973-06-05
/ 1971-03-15
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| Application Number: |
US1971000124259
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| IPC Code: |
Advanced:
A41D 13/11;
Core:
A41D 13/05;
IPC-7:
A62B 23/02;
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| ECLA Code: |
A41D13/11B6;
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| U.S. Class: |
Current:
128/206.19;
128/863;
Original:
128/146.2;
128/139;
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| Field of Search: |
128/146.2,146.6,139,141
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| Priority Number: |
| 1971-03-15 |
US1971000124259 |
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| Abstract: |
The invention is concerned with a hygienic face mask formed from a single sheet of air-filtering fibrous sheet material so folded as to provide a free space between outer and inner walls of the mask. Air flow openings are or may be provided at the rear end portion of the outer walls. The mask is held snugly against the nose and adjacent portion of the face of the wearer by means of a stiff but deformable clip member inserted in slits in the top of the mask.
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| Attorney, Agent or Firm: |
Pierce, Scheffler & Parker ;
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| Primary / Asst. Examiners: |
Kamm, William E.; Dunne, G. F.
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| Family: |
None
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| Claim |
We claim:
1. A collapsible hygienic face mask cut from a W-folded web of an air-filtering fibrous sheet material, comprising two identical double-walled halves which in their superimposed position before use have a common forward convexly curved edge (5) and two coinciding rearward straight edges (16, 17) corresponding to the folded side edges of the W-folded web, the inner (3, 4) wall portions and outer (1, 2) wall portions of the two halves of the mask being joined together along the common forward curved edge (5) from its ends to the ends (9, 10) of a middle portion thereof located in front of the mouth region of the mask, where the forward edge of the outer wall, constituted by the joined outer wall portions, in said middle portion is spaced from a straight middle portion (13) of the forward edges of the inner wall portions which are joined together by a fold (13) corresponding to the middle fold of the W-folded web, whereby a free space (15) at the mouth region will be formed between the outer and inner walls when the mask is adjusted to the face of a wearer, the inner wall of the mask being unbroken, the two outer wall portions being provided at their rear end portions with openings (20, 21) for exhaled air having passed through the inner walls to said free space between said inner and outer walls.
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| Background / Summary: |
Show background / summary
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| Drawing Descriptions: |
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| Description: |
Show description
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| Forward References: |
Show 12 U.S. patent(s) that reference this one
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