US3854401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal ignition device
Assignee: United States Department of the Army
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Filing: 1967-12-01
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Granted: 1974-12-17
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Expires: 1987-12-01
Abstract
Abstract A thermal ignition device comprising a cylindrical resonating cavity enclosed at one end with a diaphragm and made of a nonconducting material such that, when the air column is stimulated to vibrate by air pressure entering the resonant cavity, an intense heat will be generated at the diaphragm end. A heat sensitive material placed in close proximity to the diaphragm will then be ignited by the heat so generated. This device may be used to detonate a warhead or it may be used to ignite a thermal power supply.
Inventors
- 👤 E Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:20
CPC Classifications
F; F42; F42C; F42C15/00; F42C15/28; F42C15/29; F05; F05D; F05D2260/00; F05D2260/99; Y; Y10; Y10S; Y10S102/00; Y10S102/702
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A self ignition device for initiating thermal power supplies, comprising: a. a hollow cylinder having an open end and a closed end forming a resonant cavity, said closed end being a membrane and said open end being adapted to receive ram air thereby generating a substantial amount of heat in said closed end; b. a low ignition composition bonded to said membrane so that said low ignition material will be ignited by the heat generated in said closed end of said cavity; c. a thermal power supply placed in close proximity to the said closed end of said cavity so that thermal power supply will be initiated upon the ignition of said low ignition composition; d. a pressure recovery chamber having inlet ports adapted to receive ram air; and e. a nozzle connecting said pressure recovery chamber to said open end of said cavity.
Claim 2
Dependent Claim
144 words
A self ignition device for initiating thermal power supplies, comprising: a. a hollow cylinder having an open end and a closed end forming a resonant cavity, said closed end being a membrane and said open end being adapted to receive ram air thereby generating a substantial amount of heat in said closed end; b. a low ignition composition bonded to said membrane so that said low ignition material will be ignited by the heat generated in said closed end of said cavity; c. a thermal power supply placed in close proximity to the said closed end of said cavity so that thermal power supply will be initiated upon the ignition of said low ignition composition; d. a pressure recovery chamber having inlet ports adapted to receive ram air; and e. a nozzle connecting said pressure recovery chamber to said open end of said cavity.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |