US4724242A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Open cell foamed gypsum absorbents
Assignee: Individual
•
Filing: 1986-09-12
•
Granted: 1988-02-09
•
Expires: 2006-09-12
Abstract
Abstract An open-cell, foamed gypsum absorbent for fluids is prepared by foaming a slurry containing plaster, carbonaceous material, and a weak acid. Some of the preferred carbonaceous material include activated carbon, dried blood, comminuted vegetable matter containing chlorophyll, hemoglobin containing heme, and organometallic chelates. Aluminum sulfate is the preferred weak acid. Some of the gases absorbed are carbon monoxide, carbon dioxide, sulfur dioxide, ammonia, formaldehyde, nitrogen oxides, and tobacco smoke. Some of the liquids absorbed are water, salt water, urine, blood, sperm, catemenial exudate, and perspiration. This invention has applications in cigarette filters, gas masks, diapers, wound dressings, hospital or surgical sheeting, and undergarments for incontinent adults.
Inventors
- 👤 Neiko Vassileff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:59
CPC Classifications
B; B01; B01J; B01J20/00; C; C04; C04B; C04B28/00; C04B28/14; C04B2111/00; C04B2111/00474; C04B2111/00793; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91; Y10; Y10S; Y10S55/00; Y10S55/12
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
11 words
An open-cell, foamed gypsum absorbent for fluids comprising a carbonaceous material.
Claim 2
Dependent Claim
11 words
An open-cell, foamed gypsum absorbent for fluids comprising a carbonaceous material.
Claim 3
Dependent Claim
33 words
The absorbent of claim 1, wherein the carbonaceous material is selected from the group consisting of activated carbon, dried blood containing heme, sugar, organic or organometallic chelates, and comminuted vegetable matter containing chlorophyll.
Claim 4
Dependent Claim
21 words
The absorbent of claim 1, wherein the carbonaceous material comprises from about 10 percent to about 90 percent of the absorbent.
Claim 5
Dependent Claim
35 words
The absorbent of claim 1, wherein the fluid is a gas or vapor selected from the group consisting of carbon monoxide, sulfur dioxide, nitrogen oxide (NO x ), ammonia, formaldehyde, carbon dioxide, and tobacco smoke.
Claim 6
Dependent Claim
30 words
The absorbent of claim 1, wherein the fluid is a liquid selected from the group consisting of water, salt water, urine, blood, sperm, catemenial fluid, vaginal exudate, pus, and perspiration.
Claim 7
Dependent Claim
9 words
The absorbent of claim 1, further comprising aluminum sulfate.
Claim 8
Dependent Claim
18 words
The absorbent of claim 6, wherein the aluminum sulfate is from about 0.5 to about 70 weight percent.
Claim 9
Dependent Claim
8 words
A diaper comprising the absorbent of claim 1.
Claim 10
Dependent Claim
8 words
A diaper comprising the absorbent of claim 6.
Claim 11
Dependent Claim
11 words
A hospital or surgical textile comprising an absorbent of claim 1.
Claim 12
Dependent Claim
11 words
A hospital or surgical textile comprising an absorbent of claim 6.
Claim 13
Dependent Claim
11 words
A sanitary napkin or tampon comprising an absorbent of claim 1.
Claim 14
Dependent Claim
11 words
A sanitary napkin or tampon comprising an absorbent of claim 6.
Claim 15
Dependent Claim
10 words
A garment for incontinents comprising an absorbent of claim 1.
Claim 16
Dependent Claim
10 words
A garment for incontinents comprising an absorbent of claim 6.
Claim 17
Dependent Claim
9 words
A face mask comprising the absorbent of claim 1.
Claim 18
Dependent Claim
9 words
A face mask comprising the absorbent of claim 6.
Claim 19
Dependent Claim
9 words
A cigarette filter comprising the absorbent of claim 1.
Claim 20
Dependent Claim
9 words
A cigarette filter comprising the absorbent of claim 6.
Claim 21
Dependent Claim
11 words
The absorbent of claim 1, further comprising a polymeric flexibilizing agent.
Claim 22
Dependent Claim
15 words
The absorbent of claim 20, wherein the polymeric flexibilizing agent is a water-soluble addition polymer.
Claim 23
Dependent Claim
12 words
The absorbent of claim 21, wherein the water-soluble polymer is sodium polyacrylate.
Claim 24
Dependent Claim
10 words
The absorbent of claim 1, further comprising a surface-active agent.
Claim 25
Dependent Claim
11 words
The absorbent of claim 1, further comprising a polymeric foam hardener.
Claim 26
Dependent Claim
31 words
The absorbent of claim 24, wherein the polymeric foam hardener is selected from the group consisting of polyurethane, polystyrene latex, synthetic rubber latex, latices of vinyl addition polymers, polyesters, and polyamides.
Claim 27
Dependent Claim
23 words
The absorbent of claim 25, wherein the polymeric foam hardener comprises from about 10 to about 60 weight percent of the foam produced.
Claim 28
Dependent Claim
21 words
The absorbent of claim 24, wherein the polymeric foam material is foamed by air, nitrogen, carbon dioxide, or a halocarbon gas.
References Cited (Backward Citations)
US2902998A
Cited
US3526685A
Cited
US3563777A
Cited
US3758319A
Cited
US3926650A
Cited
US3719513A
Cited
US3839059A
Cited
US3974024A
Cited
US4133638A
Cited
US4084980A
Cited
US4229223A
Cited
US4240839A
Cited
US4265964A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-08 | 1991-08-10 | 1992-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-08 | 1995-08-10 | 1996-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-08 | 1999-08-10 | 2000-02-09 | $7700.00 | Window Closed / Lapsed |