Patent US3655554A successfully refreshed from Google Patents.
US3655554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire extinguishing foams containing finely dispersed silica
Assignee: Evonik Operations GmbH
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Filing: 1970-09-29
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Granted: 1972-04-11
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Expires: 1990-09-29
Abstract
Abstract The fire extinguishing characteristics of fire extinguishing agents, such as foam forming liquids, containing surface active substances, are enhanced by incorporating into the agent about 1 to 10% by weight of finely dispersed silica. Particularly advantageous results are obtained if the silica is present in fire extinguishing liquids in colloidally dissolved form.
Inventors
- 👤 Hans-Ferdi Fink
- 👤 Gotz Koerner
- 👤 Gerd Rossmy
- 👤 Gunter Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:20
CPC Classifications
A; A62; A62D; A62D1/00; A62D1/0071; Y; Y10; Y10S; Y10S516/00; Y10S516/01
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
41 words
In an aqueous fire extinguishing composition, wherein the composition comprises a surface active substance, capable of being foamed into a fire fighting foam, the improvement which comprises that the aqueous composition contains between about 1 to 10% of finely dispersed silica.
Claim 2
Dependent Claim
16 words
The improvement as claimed in claim 2, wherein said silica is colloidally dissolved in the water.
Claim 3
Dependent Claim
12 words
The improvement as claimed in claim 3, wherein said silica contains OH-groups.
Claim 4
Dependent Claim
49 words
In a method of combatting fire, wherein a liquid containing surface active substance is foamed and the foam is applied to the fire, the improvement which comprises that about 1 - 10 percent by weight of silica in fine particle form is added to the liquid or the foam.
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) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |