US3874861A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing foamed glass
Assignee: Individual
•
Filing: 1973-08-20
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Granted: 1975-04-01
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Expires: 1993-08-20
Abstract
Abstract A method is described for producing foamed glass characterized by (1) blending mineral powders, which are amorphous, or capable of being rendered amorphous by heating to a few hundred degrees centigrade, and which have a high SiO2 content and large specific area, with gas forming agents and alkali silicate, and (2) heating this mixture in the range 750 to 950*C, whereby the mixture expands due to formation of gas therein and becomes set in the thus-expanded condition.
Inventors
- 👤 Fredrik Wilhelm Anton Kurz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:59
CPC Classifications
C; C03; C03C; C03C11/00; C03C11/007; C03B; C03B19/00; C03B19/08
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
132 words
A METHOD OF PRODUCING INORGANIC FOAMED GLASS OF A DENSITY BELOW 3.2 WHICH COMPRISES MIXING IN GLASS FORMING PROPORTIONS MINERAL POWDERS WHICH ARE AMORPHOUS AND WHICH CONTAIN METAL OXIDES COMPRISING NOT MORE THAN 3% CAO AND CAPABLE OF MAKING GLASS CHEMICALLY AND MECHANICALLY RESISTANT AND HAVE A SPECIFIC SURFACE AREA OF AT LEAST 3000 CM2/G WITH GAS FORMING AGENTS AND ALKALI METAL SILICATE AND HEATING THE MIXTURE AT 750*-950*C. TO FORM A GLASS BY RACTION OF SAID MINERAL POWDERS WITH ALKALI METAL SILICATE AND TO EXPAND AND FOAM THE RESULTING GLASS, THE PROPORTION OF MINERAL POWDER TO ALKALI SILICATE IN SAID MIXTURE BEING FROM 2/1 TO 1/3, WHEREIN THE ALKALI METAL SILICATE IN THE FOAMED GALSS IS INSOLUBLE AND THE ALKALI CONTENT OF FOAMED GLASS BEING NOT MORE THAN 15% BY WEIGHT.
Claim 2
Independent Claim
132 words
A METHOD OF PRODUCING INORGANIC FOAMED GLASS OF A DENSITY BELOW 3.2 WHICH COMPRISES MIXING IN GLASS FORMING PROPORTIONS MINERAL POWDERS WHICH ARE AMORPHOUS AND WHICH CONTAIN METAL OXIDES COMPRISING NOT MORE THAN 3% CAO AND CAPABLE OF MAKING GLASS CHEMICALLY AND MECHANICALLY RESISTANT AND HAVE A SPECIFIC SURFACE AREA OF AT LEAST 3000 CM2/G WITH GAS FORMING AGENTS AND ALKALI METAL SILICATE AND HEATING THE MIXTURE AT 750*-950*C. TO FORM A GLASS BY RACTION OF SAID MINERAL POWDERS WITH ALKALI METAL SILICATE AND TO EXPAND AND FOAM THE RESULTING GLASS, THE PROPORTION OF MINERAL POWDER TO ALKALI SILICATE IN SAID MIXTURE BEING FROM 2/1 TO 1/3, WHEREIN THE ALKALI METAL SILICATE IN THE FOAMED GALSS IS INSOLUBLE AND THE ALKALI CONTENT OF FOAMED GLASS BEING NOT MORE THAN 15% BY WEIGHT.
Claim 3
Dependent Claim
19 words
The method of claim 1 including mixing crystalline powders which contain resistant metal oxides with said amorphous mineral powder.
Claim 4
Dependent Claim
27 words
The method of claim 1 in which the alkali silicate is selected from the group consisting of sodium water glass, potassium water glass and solid alkali silicate.
Claim 5
Dependent Claim
21 words
The method of claim 1 wherein the metal oxides are selected from the group consisting of Al, Mg, Ca and Fe.
Claim 6
Dependent Claim
25 words
The method of claim 2 wherein the amorphous mineral powder constitutes 25 to 60% by weight of the total mineral powder component of the mixture.
Claim 7
Dependent Claim
17 words
The method of claim 1 wherein the mixture is heated for 1 1/2 to 3 1/2 hours.
Claim 8
Dependent Claim
13 words
The method of claim 1 in which the mixture includes an alkali hydroxide.
Claim 9
Dependent Claim
13 words
The method of claim 1 in which the mixture includes an alkali carbonate.
Claim 10
Dependent Claim
13 words
The method of claim 1 in which the mixture includes a hydrogen-evolving substance.
Claim 11
Dependent Claim
13 words
The method of claim 1 in which the mixture includes a reinforcing material.
Claim 12
Dependent Claim
12 words
The method of claim 1 in which the mixture includes phosphoric acid.
Claim 13
Dependent Claim
11 words
The method of claim 1 in which the mixture includes hexametaphosphate.
Claim 14
Dependent Claim
11 words
The method of claim 1 in which the mixture includes dicyandiamide.
Claim 15
Dependent Claim
11 words
The method of claim 1 in which the mixture includes triethanolamine.
Claim 16
Dependent Claim
26 words
The method of claim 1 wherein the gas forming agents are selected from the group consisting of carbon, sulfur, carbon containing compounds and sulfur containing compounds.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |