US5297544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Respirator with inner half mask and pollutant indicator
Assignee: Draegerwerk AG and Co KGaA
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Filing: 1992-09-18
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Granted: 1994-03-29
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Expires: 2012-09-18
Abstract
Abstract A respirator with an eye space (16), through which the air to be inhaled flows, and with an indicator located on a support for indicating the efficiency of the protective device on the respiration connection, which is to retain the pollutant from the environment. The pollutant indication takes place both in the case of leakages at the sealing zones of the mask or the respiration gas-carrying lines (compressed air respirator) and in the case of insufficient filter effect. To achieve this, the support (10) is arranged on an inner half mask (3) of the respirator, and an access surface, which is exposed to the pollutant and contains the indicator (18, 118), is in flow contact with the air being inhaled, which flows through the passage openings (12, 112) between the eye space (16) of the full mask (1) and the inner half mask space (4).
Inventors
- 👤 Wolfgang May
- 👤 Wolfgang Bather
- 👤 Carl-Ernst Van der Smissen
- 👤 Gerhold Muhmel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:33
CPC Classifications
A; A62; A62B; A62B18/00; A62B18/08; A62B18/088
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
164 words
A respirator, comprising: an inner half mask for connection around the nose and mouth of a user; and a full face piece mask having a sealing edge in contact with the face of the user, said full face piece mask cooperating with said inner half mask to define a space between said inner half mask and said full face piece mask, said space being in communication with the eyes of the user; a flow opening in said full face piece mask for flow into said space; a passage opening connecting said space with an interior of said inner half mask; and indicator means located on a support, said indicator means for indicating an amount of pollutant passing into said interior of said inner half mask, said support being positioned on said inner half mask and having an access surface containing said indicator means, said access surface being in flow contact with air being inhaled and said access surface being positioned adjoining said passage opening.
Claim 2
Dependent Claim
164 words
A respirator, comprising: an inner half mask for connection around the nose and mouth of a user; and a full face piece mask having a sealing edge in contact with the face of the user, said full face piece mask cooperating with said inner half mask to define a space between said inner half mask and said full face piece mask, said space being in communication with the eyes of the user; a flow opening in said full face piece mask for flow into said space; a passage opening connecting said space with an interior of said inner half mask; and indicator means located on a support, said indicator means for indicating an amount of pollutant passing into said interior of said inner half mask, said support being positioned on said inner half mask and having an access surface containing said indicator means, said access surface being in flow contact with air being inhaled and said access surface being positioned adjoining said passage opening.
Claim 3
Dependent Claim
191 words
A respirator, comprising: an inner half mask for connection around the nose and mouth of a user; and a full face piece mask having a sealing edge in contact with the face of the user, said full face piece mask cooperating with said inner half mask to define a space between said inner half mask and said full face piece mask, said space being in communication with the eyes of the user; a flow opening in said full face piece mask for flow into said space; a passage opening connecting said space with an interior of said inner half mask for flow of gas from said space to said interior of said inner half mask; and indicator means located on a support, said indicator means for indicating an amount of pollutant passing into said interior of said inner half mask, said support being connected to said inner half mask and having an access surface containing said indicator means, said access surface being in flow contact with said flow of gas from said space to said interior of said inner half mask and said access surface being positioned adjoining said passage opening.
Claim 4
Dependent Claim
191 words
A respirator, comprising: an inner half mask for connection around the nose and mouth of a user; and a full face piece mask having a sealing edge in contact with the face of the user, said full face piece mask cooperating with said inner half mask to define a space between said inner half mask and said full face piece mask, said space being in communication with the eyes of the user; a flow opening in said full face piece mask for flow into said space; a passage opening connecting said space with an interior of said inner half mask for flow of gas from said space to said interior of said inner half mask; and indicator means located on a support, said indicator means for indicating an amount of pollutant passing into said interior of said inner half mask, said support being connected to said inner half mask and having an access surface containing said indicator means, said access surface being in flow contact with said flow of gas from said space to said interior of said inner half mask and said access surface being positioned adjoining said passage opening.
Claim 5
Dependent Claim
164 words
A respirator, comprising: an inner half mask for connection around the nose and mouth of a user; and a full face piece mask having a sealing edge in contact with the face of the user, said full face piece mask cooperating with said inner half mask to define a space between said inner half mask and said full face piece mask, said space being in communication with the eyes of the user; a flow opening in said full face piece mask for flow into said space; a passage opening connecting said space with an interior of said inner half mask; and indicator means located on a support, said indicator means for indicating an amount of pollutant passing into said interior of said inner half mask, said support being positioned on said inner half mask and having an access surface containing said indicator means, said access surface being in flow contact with air being inhaled and said access surface being positioned (adjoining) said passage opening.
Claim 6
Dependent Claim
164 words
A respirator, comprising: an inner half mask for connection around the nose and mouth of a user; and a full face piece mask having a sealing edge in contact with the face of the user, said full face piece mask cooperating with said inner half mask to define a space between said inner half mask and said full face piece mask, said space being in communication with the eyes of the user; a flow opening in said full face piece mask for flow into said space; a passage opening connecting said space with an interior of said inner half mask; and indicator means located on a support, said indicator means for indicating an amount of pollutant passing into said interior of said inner half mask, said support being positioned on said inner half mask and having an access surface containing said indicator means, said access surface being in flow contact with air being inhaled and said access surface being positioned (adjoining) said passage opening.
Claim 7
Dependent Claim
30 words
A respirator according to claim 3, wherein: said support is contained in a cup-shaped insert, said insert being connected gas tightly into said passage opening of said inner half mask.
Claim 8
Dependent Claim
24 words
A respirator according to claim 3, wherein: said support is formed as a detachable disk connected to a surface of said inner half mask.
Claim 9
Dependent Claim
73 words
A respirator according to claim 3, wherein: said indicator means is provided with a plurality of indicating ranges and said support is formed as a chip-like support element with said indicating ranges formed thereon, said indicating ranges comprising colorimetric indicator portions exposed to said air being inhaled via openings providing access surfaces of said indicating ranges; optical evaluation means being provided for scanning said indicating ranges to detect changes in said colorimetric indicator.
Claim 10
Dependent Claim
35 words
A respirator according to claim 6, wherein: said indicating ranges on said chip-like support comprise channels with channel openings forming said access surfaces, at least one channel wall being formed as an optically transparent cover.
Claim 11
Dependent Claim
23 words
A respirator according to claim 6, wherein: said indicating ranges are distributed as indication fields in a matrix-like pattern over said chip-like support.
Claim 12
Dependent Claim
24 words
A respirator according to claim 8, wherein: at least one of said indicating ranges is provided uncovered, directly exposed to said air being inhaled.
Claim 13
Dependent Claim
32 words
A respirator according to claim 8, wherein: at least one of said indicating ranges is sealed with an optically transparent cover that is permeable to pollutant potentially in said air being inhaled.
Claim 14
Dependent Claim
32 words
A respirator according to claim 6, wherein: said optical evaluation means includes a light source illuminating said indicator range, a detector receiving transmitted/reflected light from said indicator range and a measuring unit.
Claim 15
Dependent Claim
25 words
A respirator according to claim 11, wherein: said evaluation means is arranged in an immediate vicinity of said support for continuously monitoring said indicator range.
Claim 16
Dependent Claim
50 words
A respirator according to claim 6, wherein: said evaluation means and said support are accommodated in a removable insert, said removable insert including a first insert passage opening and a second insert passage opening, said removable insert receiving said support in a position for exposure to said air being inhaled.
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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) | 1997-03-28 | 1997-09-27 | 1998-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-28 | 2001-09-27 | 2002-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-03-28 | 2005-09-27 | 2006-03-29 | $7700.00 | Window Closed / Lapsed |