Patent US4804688A successfully refreshed from Google Patents.
US4804688A
Expired / Lapsed
US
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Open-cell foamed gypsum insulation
Assignee: Individual
•
Filing: 1987-09-04
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Granted: 1989-02-14
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Expires: 2007-09-04
Abstract
Abstract An aqueous slurry of gypsum plaster is stabilized by an organic, polymeric, hydrophilic stabilizer for more than 30 days without setting. Upon activation with a Lewis acid the slurry becomes hydrated. The plaster form or the hydrated form may be employed to impregnate a substrate to form insulating sheeting. The substrate may be fabric, felt, paper, nonwoven, or sponge. Open-cell, foamed gypsum may be used alone or molded to shaped articles such as bricks for a firewall.
Inventors
- 👤 Neiko I. Vassileff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:15
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/14; C04B2111/00; C04B2111/20; C04B2111/28; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
22 words
A composition for insulation comprising a plaster gypsum aqueous slurry and a polymeric stabilizer having a setting time greater than 30 days.
Claim 2
Dependent Claim
22 words
A composition for insulation comprising a plaster gypsum aqueous slurry and a polymeric stabilizer having a setting time greater than 30 days.
Claim 3
Dependent Claim
17 words
A composition for insulation as in claim 1, wherein the polymeric stabilizer is an organic, hydrophilic compound.
Claim 4
Dependent Claim
13 words
A composition for insulation as in claim 1, further comprising a surface-active agent.
Claim 5
Dependent Claim
48 words
A composition for insulation as in claim 3, wherein the weight percent composition is plaster gypsum from about 40 to about 85, water from about 15 to about 60, hydrophilic organic polymeric stabilizer from about 0.1 to about 10, and surface-active agent from about zero to about 5.
Claim 6
Dependent Claim
14 words
A composition for insulation comprising an open-cell foamed, hydrated gypsum, containing a polymeric stabilizer.
Claim 7
Dependent Claim
14 words
A composition for insulation comprising an open-cell foamed, hydrated gypsum, containing a polymeric stabilizer.
Claim 8
Dependent Claim
29 words
A composition for insulation as in claim 5 further comprising a composite material selected from the group consisting of chopped fiber, woven textile, nonwoven felt, paper, and foam sheeting.
Claim 9
Dependent Claim
48 words
A composition for insulation as in claim 6, wherein the composite material is selected from the group consisting of wool, silk, cotton, linen, flax, ramie, cellulose, cellulose derivatives, regenerated cellulose, polyester, polyamide, polyamideimide, acrylic, acrylonitrile, polyvinyl chloride, polyurethane, hydrocarbon polymer, graphite, nitride, asbestos, and mixtures and copolymers thereof.
Claim 10
Dependent Claim
26 words
A composition for insulation as in claim 3, wherein the surface-active agent is chosen from the group consisting of cationic, nonionic, and anionic and mixtures thereof.
Claim 11
Dependent Claim
32 words
A composition for insulation as in claim 1 further comprising at least one member of the group consisting of active-hydrogen adhesive promoters, antioxidants, chelating agents, colorants, lubricants, fibers, inorganic filters, and thickeners.
Claim 12
Dependent Claim
35 words
A composition as in claim 2, wherein the polymeric stabilizer has carboxylic groups and is selected from the group consisting of polyacrylic acid, hydrolyzed polyacrylonitrile, styrene-maleic copolymer, carboxymethylcellulose, and polymethacrylic acid, their salts and copolymers.
Claim 13
Dependent Claim
48 words
A process for making insulating material comprising the steps of: (a) stabilizing an aqueous slurry of gypsum plaster with a polymeric, organic, hydrophilic compound; (b) activating the stabilized slurry with a solution comprising a Lewis acid, and (c) drying the hydrated gypsum product to yield an open-cell foam.
Claim 14
Dependent Claim
48 words
A process for making insulating material comprising the steps of: (a) stabilizing an aqueous slurry of gypsum plaster with a polymeric, organic, hydrophilic compound; (b) activating the stabilized slurry with a solution comprising a Lewis acid, and (c) drying the hydrated gypsum product to yield an open-cell foam.
Claim 15
Dependent Claim
37 words
The process of claim 11 further comprising the step of employing the stabilized slurry to impregnate a substrate selected from the group consisting of a woven textile, a nonwoven sheet, a paper, a felt, or a sponge.
Claim 16
Dependent Claim
46 words
The process of claim 12, wherein the substrate comprises a material selected from the group consisting of wool, silk, cotton, linen, flax, ramie, cellulose, cellulose derivatives, regenerated cellulose, polyester, polyamide, polyamideimide, acrylic, acrylonitrile, polyvinyl chloride, polyurethane, hydrocarbon, polymer, graphite, nitride, asbestos, and mixtures and copolymers thereof.
Claim 17
Dependent Claim
21 words
The process of claim 12 further comprising the step of activating the impregnated substrate to cause the hydration of the gypsum.
Claim 18
Dependent Claim
14 words
The process of claim 12 further comprising the step of drying the impregnated substrate.
Claim 19
Dependent Claim
20 words
The process of claim 14 further comprising the step of drying the activated, impregnated substrate to produce an insulating sheet.
Claim 20
Dependent Claim
42 words
The process for producing open-cell, foamed gypsum comprising the step of mixing three streams comprising: (a) a stabilized slurry of gypsum plaster, water, and polymeric stabilizer; (b) an activator comprising Lewis acid, water, and a surface-active agent; and (c) a foaming gas.
Claim 21
Dependent Claim
42 words
The process for producing open-cell, foamed gypsum comprising the step of mixing three streams comprising: (a) a stabilized slurry of gypsum plaster, water, and polymeric stabilizer; (b) an activator comprising Lewis acid, water, and a surface-active agent; and (c) a foaming gas.
Claim 22
Dependent Claim
15 words
The process of claim 17 further comprising the step of drying the open-cell foamed gypsum.
Claim 23
Dependent Claim
31 words
The process of claim 17 further comprising the step of injecting the open-cell, foamed gypsum into an insulating cavity in building construction, whereby a concealed insulating layer is created upon drying.
Claim 24
Dependent Claim
26 words
The process of claim 17 further comprising the step of introducing the open-cell, foamed gypsum into a mold, whereby a shaped article is produced upon drying.
Claim 25
Dependent Claim
12 words
The process of claim 20, wherein the shaped article is a brick.
References Cited (Backward Citations)
US2902998A
Cited
US3563777A
Cited
US3525685A
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) | 1992-02-14 | 1992-08-15 | 1993-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-14 | 1996-08-15 | 1997-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-14 | 2000-08-15 | 2001-02-14 | $7700.00 | Window Closed / Lapsed |