US4435455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compliant composite tubular liners of fiber reinforced glass/glass-ceramic having utility as gun barrel liners
Assignee: RTX Corp
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Filing: 1983-01-10
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Granted: 1984-03-06
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Expires: 2003-01-10
Abstract
Abstract A compliant tubular liner particularly adapted to withstand brisant forces is disclosed. These liners comprising graphite or silicon carbide fiber reinforced glass or glass-ceramic have a high fracture toughness, a relatively low elastic modulus and a high temperature resistance. These articles are particularly useful as gun barrel liners.
Inventors
- 👤 Karl M. Prewo
- 👤 John J. Brennan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:44
CPC Classifications
F; F41; F41A; F41A21/00; F41A21/02; C; C03; C03C; C03C14/00; C03C14/002; C03C2214/00; C03C2214/02; C03C2214/20; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1314; Y10T428/1317; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/2973; Y10T428/2978
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
46 words
A compliant tubular liner particularly adapted to withstand brisant forces comprising a fiber reinforced glass or glass-ceramic matrix having an elastic modulus less than 15×10 6 psi and high fracture toughness exemplified by a critical stress intensity factor greater than 5×10 3 psi (inch) 1/2 .
Claim 2
Dependent Claim
46 words
A compliant tubular liner particularly adapted to withstand brisant forces comprising a fiber reinforced glass or glass-ceramic matrix having an elastic modulus less than 15×10 6 psi and high fracture toughness exemplified by a critical stress intensity factor greater than 5×10 3 psi (inch) 1/2 .
Claim 3
Dependent Claim
55 words
A composite gun barrel comprising a fiber reinforced glass or glass/ceramic matrix liner surrounded by a metal outer sleeve, the liner having an elastic modulus less than 15×10 6 psi, a fracture toughness exemplified by a critical stress intensity factor greater than 5×10 3 psi (inch) 1/2 , and being capable of withstanding brisant forces.
Claim 4
Dependent Claim
55 words
A composite gun barrel comprising a fiber reinforced glass or glass/ceramic matrix liner surrounded by a metal outer sleeve, the liner having an elastic modulus less than 15×10 6 psi, a fracture toughness exemplified by a critical stress intensity factor greater than 5×10 3 psi (inch) 1/2 , and being capable of withstanding brisant forces.
Claim 5
Dependent Claim
15 words
An article of claims 1 or 2 wherein the fibers are silicon carbide or graphite.
Claim 6
Dependent Claim
16 words
An article of claims 1 or 2 wherein the fibers range in length from 0.25-0.75 inch.
Claim 7
Dependent Claim
29 words
An article of claims 1 or 2 wherein the matrix is comprised of a glass-ceramic selected from the group consisting of lithium aluminosilicate, magnesium aluminosilicate, or a combination thereof.
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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) | 1987-03-06 | 1987-09-05 | 1988-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-06 | 1991-09-05 | 1992-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-06 | 1995-09-05 | 1996-03-06 | $7700.00 | Window Closed / Lapsed |