Patent US4029017A successfully refreshed from Google Patents.
US4029017A
Expired / Lapsed
US
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Propellant charge igniter
Assignee: Dynamit Nobel AG
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Filing: 1976-02-06
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Granted: 1977-06-14
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Expires: 1996-02-06
Abstract
Abstract A propellant charge igniter has an outer sleeve open at one end, an inner sleeve positioned within the outer sleeve and provided with a closed-end portion adjacent to the one end of said outer sleeve. A closed-end portion of the inner sleeve has predetermined bursting zones and contains a booster propellant charge. The propellant charge igniter is also provided with an expansion ring of a pressure-resistant material of low tensile strength which is arranged adjacent to the one end of the outer sleeve between the outer sleeve and the inner sleeve.
Inventors
- 👤 Gunter Hubsch
- 👤 Hellmut Bendler
- 👤 Rudolf Stahlmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:07
CPC Classifications
F; F42; F42B; F42B5/00; F42B5/38
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
87 words
A propellant charge igniter which comprises an outer sleeve, open at a front end, an inner sleeve inserted within the outer sleeve and provided adjacent to the front end with a closed bottom portion having predetermined bursting zones, said inner sleeve containing a booster propellant charge, an expansion ring of a pressure-resistant material of low tensile strength arranged adjacent to the front end of the outer sleeve between the outer sleeve and a transition zone between the bottom portion and a wall portion of the inner sleeve.
Claim 2
Dependent Claim
87 words
A propellant charge igniter which comprises an outer sleeve, open at a front end, an inner sleeve inserted within the outer sleeve and provided adjacent to the front end with a closed bottom portion having predetermined bursting zones, said inner sleeve containing a booster propellant charge, an expansion ring of a pressure-resistant material of low tensile strength arranged adjacent to the front end of the outer sleeve between the outer sleeve and a transition zone between the bottom portion and a wall portion of the inner sleeve.
Claim 3
Dependent Claim
16 words
A propellant charge igniter according to claim 1, wherein the expansion ring has a double-wedge-shaped cross-section.
Claim 4
Dependent Claim
65 words
A propellant charge igniter according to claim 1, wherein the expansion ring has an extension filling out a space between the outer sleeve and the inner sleeve subjacent to the front end of said outer sleeve, said inner sleeve having an outer diameter that is reduced adjacent to the front end of said outer sleeve, along part of its length, starting with the end thereof.
Claim 5
Dependent Claim
18 words
A propellant charge igniter according to claim 3, wherein the expansion ring comprises a cured flowable synthetic resin.
Claim 6
Dependent Claim
19 words
A propellant charge igniter according to claim 4, wherein a pulverulent, hard filler is admixed with the synthetic resin.
Claim 7
Dependent Claim
24 words
A propellant charge igniter according to claim 4, wherein the synthetic resin is selected from the group consisting of epoxy resins and polyester resins.
Claim 8
Dependent Claim
21 words
A propellant charge igniter according to claim 5, wherein filler comprises from 40 to 80% by volume of the synthetic resin.
Claim 9
Dependent Claim
35 words
A propellant charge igniter according to claim 7, wherein the filler is selected from the group consisting of: 1. metal oxides 2. metal carbides 3. carbonates 4. steel powder 5. glass powder 6. glass fiber
References Cited (Backward Citations)
DE315186C
Cited
SE113415C1
Cited
US2868128A
Cited
FR1056737A
Cited
US3351019A
Cited
US3688702A
Cited
US3789764A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |