Patent US3858392A successfully refreshed from Google Patents.
US3858392A
Expired / Lapsed
US
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Controlled burning squib arrangement
Assignee: Zeneca Inc
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Filing: 1973-10-25
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Granted: 1975-01-07
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Expires: 1993-10-25
Abstract
Abstract A controlled burning squib arrangement is presented wherein a first-stage ignition is used to heat an adjacent second-stage deflagrator such that the explosive components are substantially converted to gas in a first chamber prior to entering an expandable second chamber. Such arrangements are particularly useful in thrusters designed to drive pistons, bellows, or flexible membranes in lateral displacement mechanisms.
Inventors
- 👤 John H Evans
- 👤 Frederick R Mcewen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:34
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/04; F02; F02G; F02G3/00; F02N; F02N13/00; F02N13/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
71 words
A controlled burning squib arrangement comprising: a. a first-stage squib component having an electrically activated pyrogenic explosive; b. a second stage squib component having a pyrogenic, nondetonatable explosive in a separate cavity adjacent to and ignited by said first-stage squib; c. a rigid chamber spacing and communicating with said firststage and said second-stage squib components; and d. means for venting said rigid chamber between said squibs into an expandable second chamber.
Claim 2
Dependent Claim
71 words
A controlled burning squib arrangement comprising: a. a first-stage squib component having an electrically activated pyrogenic explosive; b. a second stage squib component having a pyrogenic, nondetonatable explosive in a separate cavity adjacent to and ignited by said first-stage squib; c. a rigid chamber spacing and communicating with said firststage and said second-stage squib components; and d. means for venting said rigid chamber between said squibs into an expandable second chamber.
Claim 3
Dependent Claim
92 words
A controlled burning squib arrangement comprising: a. a tubular rigid longitudinal casing; b. an electrically activated first-stage squib sealed at one end of said casing; c. a second-stage, non-detonatable squib component at the other end of said casing mounted in a foraminous end-closure in facing alignment with said first-stage; and d. an expandable shell encompassing said rigid casing in gas tight relationship therewith and communicating with the longidutinal casing between said first and second squibs such that gas formed by the ignition of said second-stage can pass into said encompassing expandable shell.
Claim 4
Dependent Claim
92 words
A controlled burning squib arrangement comprising: a. a tubular rigid longitudinal casing; b. an electrically activated first-stage squib sealed at one end of said casing; c. a second-stage, non-detonatable squib component at the other end of said casing mounted in a foraminous end-closure in facing alignment with said first-stage; and d. an expandable shell encompassing said rigid casing in gas tight relationship therewith and communicating with the longidutinal casing between said first and second squibs such that gas formed by the ignition of said second-stage can pass into said encompassing expandable shell.
Claim 5
Dependent Claim
36 words
A controlled burning squib arangement of claim 2 wherein said second-stage is a non-detonatable pyrogenic material contained in a cavity having a cross-sectional opening area no greater than the total opening area in said foraminous end-closure.
Claim 6
Dependent Claim
14 words
A squib arrangement of claim 2 wherein said expandable shell is a metal bellows.
Claim 7
Dependent Claim
14 words
A squib arrangement of claim 2 wherein said expandable shell is a flexible membrane.
Claim 8
Dependent Claim
15 words
A squib arrangement of claim 2 wherein said expandable shell component comprises a movable piston.
Claim 9
Dependent Claim
26 words
A controlled burning squib arrangement of claim 1 wherein said non-detonatable explosive is a deflagratable material having burning rates of 0.5 - 20 inches per second.
Claim 10
Dependent Claim
26 words
A squib arrangement of claim 7 wherein said non-detonatable explosive material is a deflagratable material under uniform compression of 30,000 - 60,000 pounds per square inch.
Claim 11
Dependent Claim
13 words
A squib arrangement of claim 8 wherein said deflagratable material is lead styphnate.
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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) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |