US4969457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Body fluids barrier mask
Assignee: Kimberly Clark Worldwide Inc
•
Filing: 1989-09-29
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Granted: 1990-11-13
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Expires: 2009-09-29
Abstract
Abstract A face mask (10) is provided for covering the mouth and nose of a wearer (14). The mask (10) prevents the passage of liquid from external to the mask to the face of the wearer (14). The mask (10) has four layers including a special low density polyethylene barrier (26). The barrier (26) prevents the passage of liquid in at least one direction while freely allowing the passage of gases in both directions.
Inventors
- 👤 Vance M. Hubbard
- 👤 Welton K. Brunson
- 👤 Darrell S. Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:46
CPC Classifications
A; A62; A62B; A62B23/00; A62B23/02; A62B23/025; A41; A41D; A41D13/00; A41D13/05; A41D13/11; A41D13/1107; A41D13/1115; A41D13/1184; A62B18/00; A62B18/08; B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; B01D2239/00; B01D2239/04; B01D2239/0471; B01D2239/0478; B01D2239/06; B01D2239/0604; B01D2239/0622; B01D2239/065
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
114 words
A method of making a face mask impervious to body liquids, comprising the steps of: dimensioning a mask portion to cover the nose and mouth of a wearer; forming said mask portion of layers of material at least one of which is a barrier layer pervious to gases yet impervious to body liquids said barrier layer formed of perforated low density polyethylene having the perforations sized to permit gas flow and to prevent the flow of body liquids therethrough; placing a layer of chemically coated cover stock over one side of said barrier layer; and connecting attachment means to said mask portion providing removable attachment of the mask to the face of the wearer.
Claim 2
Independent Claim
114 words
A method of making a face mask impervious to body liquids, comprising the steps of: dimensioning a mask portion to cover the nose and mouth of a wearer; forming said mask portion of layers of material at least one of which is a barrier layer pervious to gases yet impervious to body liquids said barrier layer formed of perforated low density polyethylene having the perforations sized to permit gas flow and to prevent the flow of body liquids therethrough; placing a layer of chemically coated cover stock over one side of said barrier layer; and connecting attachment means to said mask portion providing removable attachment of the mask to the face of the wearer.
Claim 3
Dependent Claim
27 words
The method of claim 1 and also including the step of placing an internal face layer of non-wicking material to cover one side of said barrier layer.
Claim 4
Dependent Claim
27 words
The method of claim 2 and also including the step of: placing a layer of filtration media between said layer of cover stock and said barrier layer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-11-12 | 1994-05-14 | 1994-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-12 | 1998-05-14 | 1998-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-12 | 2002-05-14 | 2002-11-13 | $7700.00 | Window Closed / Lapsed |