US4193348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projectile for centerfire pistol and revolver cartridges
Assignee: Olin Corp
•
Filing: 1978-02-15
•
Granted: 1980-03-18
•
Expires: 1998-02-15
Abstract
Abstract A projectile for a centerfire cartridge achieves maximum energy transfer with limited target penetration. A hollow point lead bullet is provided with an aluminum jacket which allows the cartridge containing the projectile to feed reliably in auto-loading pistols and yet does not restrict normal expansion of the bullet upon impact with the target. The jacket extends into the nose recess of the bullet and covers the peripheral portion of the bullet base, whereby the jacket is securely fastened to the bullet and separation subsequent to impact is prevented. A method of fabricating the projectile is also disclosed.
Inventors
- 👤 Henry J. Halverson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:46
CPC Classifications
F; F42; F42B; F42B12/00; F42B12/72; F42B12/76; F42B12/78; F42B12/02; F42B12/34
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
57 words
A projectile for small arms consisting of a soft metal bullet and a jacket at least partially enclosing said bullet, said jacket being formed of a metal having a hardness of between about 45 and about 60 as measured by the Rockwell R-15T Hardness Test and a shear strength of between about 12,000 and about 24,000 p.s.i.
Claim 2
Dependent Claim
57 words
A projectile for small arms consisting of a soft metal bullet and a jacket at least partially enclosing said bullet, said jacket being formed of a metal having a hardness of between about 45 and about 60 as measured by the Rockwell R-15T Hardness Test and a shear strength of between about 12,000 and about 24,000 p.s.i.
Claim 3
Dependent Claim
29 words
The projectile of claim 1, wherein said bullet includes a nose portion having a centrally disposed, axially aligned recess, and said jacket includes a reentrant portion within said recess.
Claim 4
Dependent Claim
25 words
The projectile of claim 2, wherein said bullet has a substantially planar base, and a portion of said jacket overlaps the periphery of said base.
Claim 5
Dependent Claim
11 words
The projectile of claim 1, wherein said jacket is substantially aluminum.
Claim 6
Dependent Claim
22 words
The projectile of claim 3, further comprising an annular knurled band formed in said jacket and adapted to receive a lubricating material.
Claim 7
Dependent Claim
90 words
A hollow-point projectile for an auto-loading pistol consisting of a soft metal bullet and a jacket enclosing said bullet; said bullet including a pointed nose portion and a planar base, said nose portion having a centrally disposed, axially aligned recess, said jacket overlapping a peripheral portion of said base and entering into said recess, at least the nose portion of said jacket being perforated whereby at least the base of said recess is exposed, whereby said jacket is securely attached to said bullet and mushrooming of said bullet is controlled.
Claim 8
Dependent Claim
90 words
A hollow-point projectile for an auto-loading pistol consisting of a soft metal bullet and a jacket enclosing said bullet; said bullet including a pointed nose portion and a planar base, said nose portion having a centrally disposed, axially aligned recess, said jacket overlapping a peripheral portion of said base and entering into said recess, at least the nose portion of said jacket being perforated whereby at least the base of said recess is exposed, whereby said jacket is securely attached to said bullet and mushrooming of said bullet is controlled.
Claim 9
Dependent Claim
43 words
The projectile of claim 6, wherein said jacket is formed of a metal having a hardness of between about 45 and about 60 as measured by the Rockwell R-15T Hardness Test and a shear strength of between about 12,000 and about 24,000 p.s.i.
Claim 10
Dependent Claim
102 words
A controlled penetration projectile consisting of a high-density, soft metal bullet having a nose portion including a centrally disposed axially aligned recess, and a jacket enclosing said bullet; said jacket completely covering said nose portion to protect the same from deformation prior to firing and entering into said recess to securely fasten said jacket to said bullet, at least the nose portion of said jacket being perforated whereby at least the base of said recess is exposed, said jacket being adapted to permit ready expansion of said nose portion upon impact with a tissue-like target whereby penetration of the projectile is limited.
Claim 11
Dependent Claim
102 words
A controlled penetration projectile consisting of a high-density, soft metal bullet having a nose portion including a centrally disposed axially aligned recess, and a jacket enclosing said bullet; said jacket completely covering said nose portion to protect the same from deformation prior to firing and entering into said recess to securely fasten said jacket to said bullet, at least the nose portion of said jacket being perforated whereby at least the base of said recess is exposed, said jacket being adapted to permit ready expansion of said nose portion upon impact with a tissue-like target whereby penetration of the projectile is limited.
Claim 12
Independent Claim
87 words
A method of fabricating a fully-jacketed hollow-point projectile for small arms comprising the steps of: (a) providing a metal core disposed within a metal cup; (b) swaging said core and said cup together so as to form a nose in the closed end of said cup and in the underlying portion of said core; and (c) piercing through said nose of said cup and into said core, thereby forming a recess in said core, a portion of said cup being driven into said recess during said piercing.
Claim 13
Independent Claim
87 words
A method of fabricating a fully-jacketed hollow-point projectile for small arms comprising the steps of: (a) providing a metal core disposed within a metal cup; (b) swaging said core and said cup together so as to form a nose in the closed end of said cup and in the underlying portion of said core; and (c) piercing through said nose of said cup and into said core, thereby forming a recess in said core, a portion of said cup being driven into said recess during said piercing.
Claim 14
Dependent Claim
32 words
The method of claim 9 and the additional step of folding the distal end portion of said cup to overlie the peripheral portion of the end of said core opposite said nose.
References Cited (Backward Citations)
US376302A
Cited
US437262A
Cited
US1080974A
Cited
US1502925A
Cited
US1633168A
Cited
US1715788A
Cited
US1730871A
Cited
US1681295A
Cited
US1892759A
Cited
US3349711A
Cited
US3881421A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-03-18 | 1983-09-17 | 1984-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-18 | 1987-09-17 | 1988-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-18 | 1991-09-17 | 1992-03-18 | $7700.00 | Window Closed / Lapsed |