Patent US4149599A successfully refreshed from Google Patents.
US4149599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fighting fire
Assignee: Kidde Fire Fighting Inc
•
Filing: 1977-06-21
•
Granted: 1979-04-17
•
Expires: 1997-06-21
Abstract
Abstract Fire-fighting foam effecting against burning hydrophilic or polar liquids like lower alcohols, ketones, etc. is made from concentrate containing thixotropic thickener dissolved in large amount, yet has a tolerable viscosity particularly when stirred. Heteropolysaccharide-7 or chain-shortened modifications of it are suitable for this purpose. The concentrate can also be made suitable for fighting fires on hydrophobic liquids by adding surfactants that cause aqueous film formation over such liquids.
Inventors
- 👤 Peter J. Chiesa, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:39
CPC Classifications
A; A62; A62D; A62D1/00; A62D1/0071; A62D1/0085
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
112 words
An aqueous pumpable fire-fighting concentrate for dilution with at least about ten times its volume of water and foaming with air to produce a fire-fighting foam having an expansion of at least about 3, the concentrate consisting essentially of water having dissolved therein a foaming agent that provides the foamability, and a thixotropic polysaccharide thickener that increases the Brookfield spindle 4 viscosity of the concentrate at 20° C. to not over about 3,000 centipoises at 60 rpm spindle speed and causes the fire-fighting foam to form an insoluble gel blanket when placed on a burning hydrophilic liquid, the concentration of the thickener in the concentrate being at least about 1% by weight.
Claim 2
Dependent Claim
112 words
An aqueous pumpable fire-fighting concentrate for dilution with at least about ten times its volume of water and foaming with air to produce a fire-fighting foam having an expansion of at least about 3, the concentrate consisting essentially of water having dissolved therein a foaming agent that provides the foamability, and a thixotropic polysaccharide thickener that increases the Brookfield spindle 4 viscosity of the concentrate at 20° C. to not over about 3,000 centipoises at 60 rpm spindle speed and causes the fire-fighting foam to form an insoluble gel blanket when placed on a burning hydrophilic liquid, the concentration of the thickener in the concentrate being at least about 1% by weight.
Claim 3
Dependent Claim
13 words
The concentrate of claim 1 in which the polysaccharide is a degraded heteropolysaccharide-7.
Claim 4
Dependent Claim
90 words
The process of fighting a fire on a body of hydrophilic liquid, which process comprises applying to the burning surface of that liquid a foam having an expansion of at least about 3 foamed from an aqueous solution of a foaming agent and thixotropic polysaccharide selected from the class consisting of heteropolysaccharide-7 and degraded forms of heteropolysaccharide-7, the polysaccharide being dissolved in that solution in an amount that causes the foam to form a gel blanket when it contacts the hydrophilic liquid, and the solution being essentially in sea water.
Claim 5
Dependent Claim
90 words
The process of fighting a fire on a body of hydrophilic liquid, which process comprises applying to the burning surface of that liquid a foam having an expansion of at least about 3 foamed from an aqueous solution of a foaming agent and thixotropic polysaccharide selected from the class consisting of heteropolysaccharide-7 and degraded forms of heteropolysaccharide-7, the polysaccharide being dissolved in that solution in an amount that causes the foam to form a gel blanket when it contacts the hydrophilic liquid, and the solution being essentially in sea water.
Claim 6
Dependent Claim
17 words
The concentrate of claim 1 in which the concentration of the polysaccharide is over 1.1% by weight.
Claim 7
Dependent Claim
59 words
The concentrate of claim 1 in which the polysaccharide is selectd from the class consisting of heteropolysaccharide-7 and degraded forms of heteropolysaccharide-7, and the concentrate also contains magnesium sulfate dissolved in a proportion at least about 1/6 the weight of the polysaccharide and sufficient to improve the fire-fighting effectiveness of the concentrate when it is diluted with fresh water.
References Cited (Backward Citations)
US3984334A
Cited
US3957657A
Cited
US3957658A
Cited
US4060489A
Cited
US3915800A
Cited
US3849315A
Cited
US4060132A
Cited
US4089804A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-16 | 1982-10-16 | 1983-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-16 | 1986-10-16 | 1987-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-16 | 1990-10-16 | 1991-04-17 | $7700.00 | Window Closed / Lapsed |