US3581826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for extinguishing fires by dispensing polymer foam forming mixtures
Assignee: Pharmacia and Upjohn Co
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Filing: 1968-12-10
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Granted: 1971-06-01
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Expires: 1988-12-10
Abstract
Abstract A process for extinguishing fires burning on the surface of combustible liquids is disclosed. A thermally resistant rigid polymer foam forming reaction mixture is dispensed directly on to the burning liquid surface so as to form a continuous solid layer over the entire surface of the combustible liquid. At the time at which it reaches the foam surface the foam reaction mixture is in a state of reaction beyond the start of foam rise but prior to gelation. In addition to extinguishing the fire the polymer foam layer serves as a floating protective blanket over the combustible liquid, preventing contamination and/or reignition.
Inventors
- 👤 Thomas P Dougan
- 👤 Samuel Chess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:49
CPC Classifications
A; A62; A62C; A62C5/00; A62C5/002; A62D; A62D1/00; A62D1/0071; Y; Y10; Y10S; Y10S521/00; Y10S521/902
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
47 words
The process of claim 1 wherein said polymer foam forming reaction mixture has a rise time within the range of about 2 seconds to about 30 seconds and on interval between rise time and gel time within the range of about 1 second to about 90 seconds.
Claim 2
Dependent Claim
28 words
The process of claim 1 wherein the time interval between the moment of contacting the burning surface and the point of foam gelation is less than 15 seconds.
Claim 3
Dependent Claim
65 words
A process according to claim 1 wherein the rigid cellular polymer forming reaction mixture is discharged from a foam mix delivery means on to the surface of the burning liquid initially at a point on the periphery of the burning area and the foam mix delivery means is subsequently advanced over the burning area so as to completely blanket the burning surface with cellular polymer.
Claim 4
Dependent Claim
16 words
A process according to claim 4 wherein a plurality of foam mix delivery means is employed.
Claim 5
Dependent Claim
141 words
A process for extinguishing a fire burning on the surface of a combustible liquid which process comprises: dispensing from a foam mixing and dispensing head on to the surface of the burning liquid a rigid cellular polymer forming reaction mixture wherein the polymer foam forming reaction mixture of ingredients is one necessary to produce a rigid, thermally resistant cellular polymer selected from the class consisting of cellular polyisocyanurates, polyurethanes, polyureas, polyoxazolidinones and polyimides; said mixture being in a stage of reaction beyond the start of foam rise and prior to the point of foam gelation at the time at which it contacts said burning surface; said foam mixing and dispensing head being made to traverse the burning surface of said combustible liquid in a series of parallel paths so as to dispense a continuous layer of polymer foam on said surface.
Claim 6
Dependent Claim
45 words
The process of claim 6 wherein the initial traverse of said foam mixing and dispensing head is made across a perimeter of said burning surface and subsequent traverses each advance said foam mixing and dispensing head incrementally across said surface towards the opposite perimeter thereof.
References Cited (Backward Citations)
US2907627A
Cited
US3158667A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |