Patent US3885500A successfully refreshed from Google Patents.
US3885500A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Percussion igniter for projectiles and projectile embodying the same
Assignee: Individual
•
Filing: 1973-10-16
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Granted: 1975-05-27
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Expires: 1993-10-16
Abstract
Abstract A percussion igniter for projectiles, having a striker located up-stream of a thin walled primer and having in line with an annular bottom of a primer carrier, an annular and concave lower face, which centrally draws out into a coaxial protruding part.
Inventors
- 👤 Robert M Bornand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:48
CPC Classifications
F; F42; F42C; F42C19/00; F42C19/08; F42C19/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
116 words
In a percussion igniter for projectiles, comprising an igniter body, a primer within said igniter body, a striker disposed in said igniter body for movement toward and away from said primer, said body having an annular internal shoulder thereon that surrounds an opening through the bottom of said primer to provide access to said striker, said body and primer and striker and shoulder being coaxial; the improvement in which said striker has a concave surface confronting said annular shoulder whereby upon combustion of said primer, said striker is forced against said annular shoulder to flatten out said concave surface against said annular shoulder thereby to seal against the escape of gas under pressure through said opening.
Claim 2
Dependent Claim
116 words
In a percussion igniter for projectiles, comprising an igniter body, a primer within said igniter body, a striker disposed in said igniter body for movement toward and away from said primer, said body having an annular internal shoulder thereon that surrounds an opening through the bottom of said primer to provide access to said striker, said body and primer and striker and shoulder being coaxial; the improvement in which said striker has a concave surface confronting said annular shoulder whereby upon combustion of said primer, said striker is forced against said annular shoulder to flatten out said concave surface against said annular shoulder thereby to seal against the escape of gas under pressure through said opening.
Claim 3
Dependent Claim
20 words
An igniter as claimed in claim 1, and a hollow thin-walled protrusion extending axiAlly from said striker into said opening.
Claim 4
Dependent Claim
36 words
An igniter as claimed in claim 1, and a solid projection extending axially from said striker into said opening, said projection being reduced in diameter at its base to promote collapse of said projection upon impact.
Claim 5
Dependent Claim
20 words
An igniter as claimed in claim 1, and a coil compression spring extending axially from said striker into said opeing.
Claim 6
Dependent Claim
17 words
A projectile having an explosive charge therein and a percussion igniter therefor as claimed in claim 1.
References Cited (Backward Citations)
US624145A
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US2421266A
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US2415803A
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US2926607A
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US3114290A
Cited
US3396658A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |