US4382440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Smoke and pollutant filtering device
Assignee: Individual
•
Filing: 1981-03-18
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Granted: 1983-05-10
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Expires: 2001-03-18
Abstract
Abstract A smoke and pollutant filtering device comprising a mask having a filter composed of a series of contiguous, serial layers of filtering material. The filter consists of front and rear gas permeable covers, a first filter layer of pressed vegetable matter, a second filter layer comprising a layer of activated charcoal adjacent a layer of aqua filter floss, a third filter comprising a gas permeable cloth situated between layers of pressed vegetable matter, and a fourth filter layer comprising an aqua filter floss. The first through fourth filter layers are sandwiched between the front and rear gas permeable covers. The filtering device is stitched together and mounted within a fire-retardant hood shaped to fit over a human head. Elastic bands are included in the hood to maintain the hood snugly about the head when worn.
Inventors
- 👤 Nancy J. Kapp
- 👤 Charles H. Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:41
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/08; B01D39/083; A; A41; A41D; A41D13/00; A41D13/05; A41D13/11; A41D13/1107; A41D13/1138; A41D13/1146; A62; A62B; A62B17/00; A62B17/04; B01D2239/00; B01D2239/04; B01D2239/0407; B01D2239/0457; B01D2239/06; B01D2239/065
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
109 words
A smoke and pollutant filtering device comprising a series of contiguous layers of filtering material, consisting of a. front and rear gas permeable covers, b. a first filter layer of pressed vegetable matter adjacent said front cover, c. a second filter layer comprising a layer of activated charcoal adjacent a layer of aqua filter floss, and including means to maintain said layer of activated charcoal adjacent said layer of aqua filter floss, d. a third filter layer comprising a gas permeable cloth situated between layers of pressed vegetable matter, and e. a fourth filter layer comprising an aqua filter floss, said fourth filter layer being adjacent said rear cover.
Claim 2
Dependent Claim
109 words
A smoke and pollutant filtering device comprising a series of contiguous layers of filtering material, consisting of a. front and rear gas permeable covers, b. a first filter layer of pressed vegetable matter adjacent said front cover, c. a second filter layer comprising a layer of activated charcoal adjacent a layer of aqua filter floss, and including means to maintain said layer of activated charcoal adjacent said layer of aqua filter floss, d. a third filter layer comprising a gas permeable cloth situated between layers of pressed vegetable matter, and e. a fourth filter layer comprising an aqua filter floss, said fourth filter layer being adjacent said rear cover.
Claim 3
Dependent Claim
23 words
The filtering device according to claim 1 in which said first through fourth filter layers are bound between said front and rear covers.
Claim 4
Dependent Claim
47 words
The filtering device according to claim 1 in which said means to maintain comprises a pair of layers of pressed vegetable matter between which said layers of aqua filter floss and activated charcoal are situated, and including means binding together the layers of said second filter layer.
Claim 5
Dependent Claim
23 words
The filtering device according to claim 3 in which said binding means comprises stitching about the outer periphery of said second filter layer.
Claim 6
Dependent Claim
37 words
The filtering device according to claim 1 in which said means to maintain comprises a layer of gas permeable cloth, said activated charcoal being situated between said gas permeable cloth and said layer of aqua filter floss.
Claim 7
Dependent Claim
24 words
The filtering device according to claim 1 including at least two of said second filter layers, said second filter layers being adjacent one another.
Claim 8
Dependent Claim
33 words
The filtering device according to claim 1 including a fire-retardant hood shaped to fit over a human head, said filtering device being mounted within said hood in registration with the nose and mouth.
Claim 9
Dependent Claim
17 words
The filtering device according to claim 7 including means to snuggly maintain said hood about the head.
Claim 10
Dependent Claim
29 words
The filtering device according to claim 8 in which said means to snuggly maintain comprises a series of spaced elastic bands situated circumferentially about and attached to said hood.
Claim 11
Dependent Claim
37 words
The filtering device according to claim 7 in which said aqua filter floss is maintained moist, and including a sealable package for said filtering device and hood to retain the moisture content of said aqua filter floss.
Claim 12
Dependent Claim
153 words
A smoke and pollutant filtering device comprising a. a fire-retardant hood shaped to fit over a human head, b. a filtering device comprising a series of contiguous layers of filtering material and situated within said hood in registration with the nose and mouth, said filtering device consisting of i. front and rear gas permeable covers, and at least three filter layers between said covers, said layers comprising ii. one filter layer of pressed vegetable matter adjacent said front cover, iii. another filter layer comprising a layer of activated charcoal adjacent a layer of aqua filter floss, and including means to maintain said layer of activated charcoal adjacent said layer of awua filter floss, and iv. a third filter layer comprising a gas permeable cloth situated between layers of pressed vegetable matter, and c. means to maintain a predetermined moisture content for said aqua filter floss when said filtering device is not in use.
Claim 13
Dependent Claim
153 words
A smoke and pollutant filtering device comprising a. a fire-retardant hood shaped to fit over a human head, b. a filtering device comprising a series of contiguous layers of filtering material and situated within said hood in registration with the nose and mouth, said filtering device consisting of i. front and rear gas permeable covers, and at least three filter layers between said covers, said layers comprising ii. one filter layer of pressed vegetable matter adjacent said front cover, iii. another filter layer comprising a layer of activated charcoal adjacent a layer of aqua filter floss, and including means to maintain said layer of activated charcoal adjacent said layer of awua filter floss, and iv. a third filter layer comprising a gas permeable cloth situated between layers of pressed vegetable matter, and c. means to maintain a predetermined moisture content for said aqua filter floss when said filtering device is not in use.
Claim 14
Dependent Claim
110 words
A smoke and pollutant filtering device comprising a series of contiguous layers of filtering material, consisting of a. a front gas permeable cover, b. a first filter layer of pressed vegetable matter adjacent said front cover, c. a second filter layer comprising a layer of activated charcoal adjacent a layer of aqua filter floss, and including means to maintain said layer of activated charcoal adjacent said layer of aqua filter floss, d. a third filter layer comprising a gas permeable cloth situated between layers of pressed vegetable matter, and e. a rear gas permeable cover, said first, second and third filter layers being situated between said front and rear covers.
Claim 15
Dependent Claim
110 words
A smoke and pollutant filtering device comprising a series of contiguous layers of filtering material, consisting of a. a front gas permeable cover, b. a first filter layer of pressed vegetable matter adjacent said front cover, c. a second filter layer comprising a layer of activated charcoal adjacent a layer of aqua filter floss, and including means to maintain said layer of activated charcoal adjacent said layer of aqua filter floss, d. a third filter layer comprising a gas permeable cloth situated between layers of pressed vegetable matter, and e. a rear gas permeable cover, said first, second and third filter layers being situated between said front and rear covers.
Claim 16
Dependent Claim
19 words
The filtering device according to claim 12 including a filter layer of aqua filter floss adjacent said rear cover.
Claim 17
Dependent Claim
24 words
The filtering device according to claim 12 including at least two of said second filter layers, said second filter layers being adjacent one another.
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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) | 1986-05-09 | 1986-11-08 | 1987-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-09 | 1990-11-08 | 1991-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-09 | 1994-11-08 | 1995-05-10 | $7700.00 | Window Closed / Lapsed |