US3669020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Firebomb igniter devices and components therefor
Assignee: ORDNANCE RESEARCH Inc
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Filing: 1970-05-06
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Granted: 1972-06-13
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Expires: 1990-05-06
Abstract
Abstract Firebomb igniter devices designed to spread hundreds of burning particles over wide areas are constructed from a stack of ringshaped wafers encased in a canister surrounding an explosive fuse unit. The wafers are compression molded powder mixtures of combustible metal and fluoroalkylene polymer, e.g., magnesium metal and polytetrafluoroethylene compacted to about 70 to 95 percent of ultimate density. Upon detonation of the igniter device, the wafers break into hundreds of small particles that disseminate to distances of 100 feet or more and burn for several seconds providing ignition points for areas of fuel concentration within a firebomb pattern.
Inventors
- 👤 Hal R Waite
- 👤 Carl F Lucy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:05
CPC Classifications
F; F42; F42B; F42B12/00; F42B12/02; F42B12/36; F42B12/44
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
21 words
The devIce claimed in claim 1 wherein said wafers are made of a mixture of magnesium metal powder and powdered polytetrafluoroethylene.
Claim 2
Dependent Claim
47 words
The device of claim 2 wherein said stack of wafers extends above the surrounded explosive fuse means and the cylindrical volume within such extension of the stack is filled with substantially uncompacted powder mixture of 50-80 percent magnesium metal powder and 20 to 50 percent powdered polytetrafluoroethylene.
Claim 3
Dependent Claim
23 words
The device of claim 1 wherein said wafers have a hardness of between about 85 and 95 on the Shore hardness C scale.
Claim 4
Dependent Claim
38 words
The device of claim 1 wherein the outer diameter of said wafers is between about 1.5 to 3 times the inner diameter and the thickness of the wafers is between about 0.2 to 0.4 times said inner diameter.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |