Patent US3861314A successfully refreshed from Google Patents.
US3861314A
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Concave-compound pointed finned projectile
Assignee: Textron Systems Corp
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Filing: 1966-12-30
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Granted: 1975-01-21
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Expires: 1986-12-30
Abstract
Abstract A projectile adapted to curl and tumble on impact with a target, and having a long cylindrical shank section with a concave tapered blunt nose and rear stabilizing fins.
Inventors
- 👤 Irwin R Barr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:16
CPC Classifications
F; F42; F42B; F42B6/00; F42B6/02; F42B6/04; Y; Y10; Y10S; Y10S102/00; Y10S102/703
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
53 words
A one piece projectile adapted to curl and tumble on impact with a target, comprising: a long cylindrical shank section, a blunt nosed concave tapered forward end section integral with and materially shorter than said shank section, and a rear section integral with said shank section and having integral stabilizing fins formed thereon.
Claim 2
Dependent Claim
53 words
A one piece projectile adapted to curl and tumble on impact with a target, comprising: a long cylindrical shank section, a blunt nosed concave tapered forward end section integral with and materially shorter than said shank section, and a rear section integral with said shank section and having integral stabilizing fins formed thereon.
Claim 3
Dependent Claim
75 words
A projectile according to claim 1, said concave tapered forward end section having a substantially flat tip end and being formed with two distinct adjoining tapered frusto-conical surfaces having an annular junction line between said cylindrical shank section and said flat tip end, the forwardmost of said frusto-conical surfaces forming a smaller longitudinally extending included angle between its diametral surfaces than the other said frusto-conical surface and being substantially shorter than the other frusto-conical surface.
Claim 4
Dependent Claim
96 words
A projectile according to claim 2, said smaller longitudinally included angle formed by said forwardmost frusto-conical surface being in the range of approximately 5-7*, said other adjoining rearward frusto-conical surface longitudinally included angle being in the range of approximately 10-12 *, the ratio of said forwardmost frusto-conical surface length to the other adjoining frusto-conical surface length being about 1-3, and the ratio of the length of said shank and tail sections to the length of said forward end concave section being at least 3-1, with a total length to shank diameter ratio of at least 15-1.
Claim 5
Dependent Claim
80 words
A flechette projectile according to claim 3, said projectile length being approximately 1.65 inches, said forwardmost included angle of taper being approximately 10*, the included angle of the other said tapered surface being approximately 6*, the tip end being flat and of a diameter of approximately 0.005 inches, the cylindrical shank diameter being approximately 0.070 inches, the axial length of the forwardmost frusto-conical surface section being approximately 0.11 inches, and the projectile hardness being between Rc 40 and Rc 50.
References Cited (Backward Citations)
US213083A
Cited
US2288562A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |