Patent US4577431A successfully refreshed from Google Patents.
US4577431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wear resistant gun barrel and method of forming
Assignee: General Dynamics OTS Inc
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Filing: 1984-05-02
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Granted: 1986-03-25
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Expires: 2004-05-02
Abstract
Abstract A gun barrel is produced by vacuum plasma spray depositing an inner layer of a refractory metal as a gun barrel liner on a mandrel, followed by deposit of successive layers of dense gun barrel jacket material to build up a structure from the inside out. The outermost layer can include attachment means for fixing the barrel into a gun mechanism.
Inventors
- 👤 Paul A. Siemers
- 👤 Robert W. Kopp
- 👤 Melvin R. Jackson
- 👤 Steven R. Duke
- 👤 David P. Perrin
- 👤 Ying H. Liu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:05
CPC Classifications
F; F41; F41A; F41A21/00; F41A21/02; C; C23; C23C; C23C4/00; C23C4/18; C23C4/185
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
53 words
A composite gun barrel comprising, an inner liner of a refractory metal, a transition layer of said refractory metal and a jacket metal, said transition layer being bonded to said liner, an outer jacket of structural metal bonded to said transition layer, said liner, transition layer and jacket being intimately metallurgically bonded together.
Claim 2
Dependent Claim
53 words
A composite gun barrel comprising, an inner liner of a refractory metal, a transition layer of said refractory metal and a jacket metal, said transition layer being bonded to said liner, an outer jacket of structural metal bonded to said transition layer, said liner, transition layer and jacket being intimately metallurgically bonded together.
Claim 3
Dependent Claim
41 words
The barrel of claim 1 wherein the transition layer is graded in composition from a high concentration of refractory at the inner portion of the transition layer to a low concentration of refractory at the outer portion of the transition layer.
Claim 4
Dependent Claim
42 words
The barrel of claim 1 wherein the inner liner refractory metal has an inner rifled surface and a greater thickness of refractory is disposed at the rifled muzzle end of the barrel than along the remainder of the rifling of the barrel.
Claim 5
Dependent Claim
39 words
The barrel of claim 1 wherein the barrel includes a chamber at one end and the inner liner refractory metal has an inner rifled surface and a greater thickness of refractory is disposed in the rifling proximate the chamber.
Claim 6
Dependent Claim
41 words
The barrel of claim 1 wherein the inner inner refractory metal has a variable pitch inner rifled surface and wherein a greater thickness of refractory is disposed at the location of the rifling where the rifling is given an increased pitch.
Claim 7
Dependent Claim
32 words
The barrel of claim 1 wherein the barrel includes a chamber at one end to receive a cartridge and a greater thickness of refractory is disposed where the gases exit the cartridge.
Claim 8
Dependent Claim
29 words
The barrel of claim 1 wherein the barrel includes a chamber at one end thereof and a greater thickness of liner is formed about the chamber of the barrel.
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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) | 1989-03-24 | 1989-09-23 | 1990-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-24 | 1993-09-23 | 1994-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-24 | 1997-09-23 | 1998-03-25 | $7700.00 | Window Closed / Lapsed |