US4612333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foamed gypsum filter containing carbonaceous material
Assignee: Individual
•
Filing: 1985-03-22
•
Granted: 1986-09-16
•
Expires: 2005-03-22
Abstract
Abstract A filter composition is formed from a foamed gypsum combined with fine particulate carbonaceous material such as activated carbon, dried blood and comminuted vegetable matter. The combination of activated carbon with dried blood provides a particularly effective human user filter system. A broad range of filter uses are contemplated such as face masks and cigarette filters.
Inventors
- 👤 Neiko I. Vassileff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:16
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/14; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
11 words
A foamed gypsum filter for filtering oxygenated gases comprising carbonaceous material.
Claim 2
Dependent Claim
11 words
A foamed gypsum filter for filtering oxygenated gases comprising carbonaceous material.
Claim 3
Dependent Claim
23 words
The filter of claim 1, wherein the oxygenated gases are selected from the group consisting of carbon monoxide, sulfur dioxide, and nitrogen oxides.
Claim 4
Dependent Claim
27 words
The filter of claim 1, wherein the carbonaceous material is selected from the group consisting of activated carbon, dried blood, comminuted vegetable matter, chelate and metal chelates.
Claim 5
Dependent Claim
11 words
The filter of claim 3, wherein the vegetable matter comprises chlorophyll.
Claim 6
Dependent Claim
11 words
The filter of claim 3, wherein the dried blood comprises hemoglobin.
Claim 7
Dependent Claim
15 words
The filter of claim 3, wherein the carbonaceous material comprises activated carbon and dried blood.
Claim 8
Dependent Claim
23 words
The filter of claim 1, wherein the foamed gypsum and the carbonaceous material are present at about equal weight on a dry basis.
Claim 9
Dependent Claim
24 words
The filter of claim 1, wherein the carbonaceous material is present from about one-fifth to about five times the weight of the foamed gypsum.
Claim 10
Dependent Claim
25 words
The filter of claim 2, wherein the filter removes from about 58 to about 96% of carbon monoxide flowing through it in a 15-minute period.
Claim 11
Dependent Claim
24 words
The filter of claim 2, wherein the filter removes about 18 to about 86% of sulfur dioxide flowing through it in a 15-minute period.
Claim 12
Dependent Claim
21 words
The filter of claim 2, wherein the filter removes about 77% of nitrogen oxide flowing through it in a 15-minute period.
Claim 13
Dependent Claim
12 words
The filter of claim 3 in the form of a face mask.
Claim 14
Dependent Claim
12 words
The filter of claim 3 in the form of a cigarette filter.
Claim 15
Dependent Claim
29 words
A filter composition for filtering oxygenated gases selected form the group consisting of carbon monoxide, sulfur dioxide, and nitrogen oxide comprising foamed gypsum, carbonaceous material, and a flexibilizing agent.
Claim 16
Dependent Claim
29 words
A filter composition for filtering oxygenated gases selected form the group consisting of carbon monoxide, sulfur dioxide, and nitrogen oxide comprising foamed gypsum, carbonaceous material, and a flexibilizing agent.
Claim 17
Dependent Claim
34 words
The filter composition of claim 14, wherein the carbonaceous material is in the form of fine particles selected from the group consisting of activated carbon, dried blood, comminuted vegetable matter, chelate, and metal chelates.
Claim 18
Dependent Claim
13 words
The filter composition of claim 14, wherein the flexibilizing agent is sodium polyacrylate.
Claim 19
Dependent Claim
10 words
The filter composition of claim 14 further comprising a detergent.
Claim 20
Dependent Claim
22 words
The filter composition of claim 14 further comprising a polymeric foam selected from the group consisting of polyurethane, urea-formaldehyde resin, and polystyrene.
Claim 21
Dependent Claim
19 words
The filter composition of claim 15, wherein said fine particles are from about -50 mesh to about -300 mesh.
Claim 22
Dependent Claim
16 words
The filter composition of claim 15, wherein said carbonaceous material comprises activated carbon and dried blood.
Claim 23
Dependent Claim
15 words
The filter composition of claim 15, wherein said carbonaceous material comprises activated carbon and chlorophyll.
Claim 24
Dependent Claim
14 words
The filter composition of claim 20 in the form of a face mask filter.
Claim 25
Independent Claim
76 words
A method for making a filter composition for filtering oxygenated gases selected from the group consisting of carbon monoxide, sulfur dioxide, and nitrogen oxide, said composition comprising foamed gypsum, a flexibilizing agent, and a carbonaceous material selected from the group consisting of activated carbon, dried blood, comminuted vegetable matter, chelate and metal chelates comprising: mixing gypsum, water, and fine particles of the carbonaceous material to form a slurry; and combining the slurry with a foaming agent.
Claim 26
Independent Claim
76 words
A method for making a filter composition for filtering oxygenated gases selected from the group consisting of carbon monoxide, sulfur dioxide, and nitrogen oxide, said composition comprising foamed gypsum, a flexibilizing agent, and a carbonaceous material selected from the group consisting of activated carbon, dried blood, comminuted vegetable matter, chelate and metal chelates comprising: mixing gypsum, water, and fine particles of the carbonaceous material to form a slurry; and combining the slurry with a foaming agent.
Claim 27
Dependent Claim
18 words
The method of claim 23, wherein the slurry has a a pH from about 7 to about 12.
Claim 28
Dependent Claim
12 words
The method of claim 23, wherein the slurry further comprises a detergent.
Claim 29
Dependent Claim
14 words
The method of claim 23, wherein the slurry further comprises a foam softening agent.
Claim 30
Dependent Claim
19 words
The method of claim 23, wherein the gypsum and carbonaceous material are present in about equal amounts by weight.
Claim 31
Dependent Claim
25 words
The method of claim 23, wherein the foaming agent is selected from the group consisting of urethane, urea-formaldehyde resin, styrene, gaseous halocarbon, and polymeric latex.
Claim 32
Dependent Claim
28 words
The method of claim 26, wherein said foam softening agent is present in an amount of from about 5 to about 10% by weight of the dry gypsum.
Claim 33
Dependent Claim
18 words
The method of claim 23, wherein said fine particles are from about -50 mesh to about -300 mesh.
Claim 34
Dependent Claim
15 words
The method of claim 23, wherein said carbonaceous material comprises activated carbon and dried blood.
Claim 35
Dependent Claim
23 words
The method of claim 31, wherein the filter removes about 58 to about 96% of carbon monoxide gas initially present at 550 ppm.
Claim 36
Dependent Claim
14 words
The method of claim 23, wherein said carbonaceous material comprises activated carbon and chlorophyll.
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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) | 1989-09-15 | 1990-03-17 | 1990-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-15 | 1994-03-17 | 1994-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-15 | 1998-03-17 | 1998-09-16 | $7700.00 | Window Closed / Lapsed |