US3851586A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature compensated pyrotechnic delays
Assignee: United States Department of the Navy
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Filing: 1973-05-15
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Granted: 1974-12-03
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Expires: 1993-05-15
Abstract
Abstract An improved pyrotechnic delay system wherein temperature compensation is utilized to minimize or eliminate ambient temperature effects upon the burning rate and variability of the delay. The pyrotechnic delay column is surrounded with a volume of material which is easily ignited, high-heat producing, and fast burning relative to the burning rate of the delay column. Heat released by this material heats th body of the delay system, creating an elevated temperature environment for the delay column which is desirable to enhance the predictability of the delay time variable and to minimize adverse effects of the actual ambient temperature. Various configurations are possible in surrounding the delay column with the heat producing material.
Inventors
- 👤 W Eller
- 👤 F Valenta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:52
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/10; F42B3/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
55 words
A temperature-compensated pyrotechnic delay system comprising: a containment member; first pyrotechnic means within said member; an easily ignited, faster-burning, exothermic second pyrotechnic means within said member; and ignition means to initiate a reaction in said first and said second pyrotechnic means whereby said second pyrotechnic means produces an elevated temperature condition in said delay system.
Claim 2
Dependent Claim
55 words
A temperature-compensated pyrotechnic delay system comprising: a containment member; first pyrotechnic means within said member; an easily ignited, faster-burning, exothermic second pyrotechnic means within said member; and ignition means to initiate a reaction in said first and said second pyrotechnic means whereby said second pyrotechnic means produces an elevated temperature condition in said delay system.
Claim 3
Dependent Claim
20 words
The delay system of claim 1 wherein said first pyrotechnic means is a delay column having a determinable burn rate.
Claim 4
Dependent Claim
16 words
The delay system of claim 2 wherein said ignition means includes an igniter compound easily ignited.
Claim 5
Dependent Claim
73 words
The delay system of claim 3 further comprising: a bore extending through said containment member; a longitudinal passage in said containment member; and a heat conductive separation means between said bore and said passage whereby said delay column is positioned in said bore and said exothermic compoUnd is positioned in said passage such that during pyrotechnic reaction, heat released by said exothermic compound is conducted to said delay column and said containment member.
Claim 6
Dependent Claim
26 words
The delay system of claim 4 wherein said passage is concentric with said bore and said separation means comprises a tubular portion of said containment member.
Claim 7
Dependent Claim
41 words
The delay system of claim 4 wherein said passage comprises a plurality of longitudinally extending holes in said containment member spaced around said bore and said separation means comprises the portion of said containment member between said holes and said bore.
Claim 8
Dependent Claim
34 words
The delay system of claim 4 wherein said passage is concentric with said bore, said separation means comprises a tubular element of thermally conductive material, and said containment member is of thermally insulative material.
Claim 9
Dependent Claim
22 words
The delay system of claim 4 wherein said passage comprises a tubular element of thermally conductive material positioned within said delay column.
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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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |