Patent US3742640A successfully refreshed from Google Patents.
US3742640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite firearm barrel
Assignee: United States Department of the Army
•
Filing: 1971-05-14
•
Granted: 1973-07-03
•
Expires: 1991-05-14
Abstract
Abstract A composite barrel incorporates means for resisting the radial distribution of heat originating in the barrel bore.
Inventors
- 👤 D Thomsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:04
CPC Classifications
F; F41; F41A; F41A21/00; F41A21/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
48 words
In a barrel comprising a plurality of cylindrical members in coaxial nested relationship forming interface surfaces therebetween, the addition of induced means for resisting the radial distribution of heat through said barrel, said means comprising a rough surface texture formed on at least one of such interface surfaces.
Claim 2
Dependent Claim
48 words
In a barrel comprising a plurality of cylindrical members in coaxial nested relationship forming interface surfaces therebetween, the addition of induced means for resisting the radial distribution of heat through said barrel, said means comprising a rough surface texture formed on at least one of such interface surfaces.
Claim 3
Dependent Claim
29 words
The invention as defined in claim 1 wherein said one of said surfaces comprises the outside surface of that member disposed adjacent to the longitudinal axis of said barrel.
Claim 4
Dependent Claim
34 words
The invention as defined in claim 1 wherein said one of said surfaces comprises the inside surface of that member having contact with the member disposed adjacent to the longitudinal axis of said barrel.
Claim 5
Dependent Claim
20 words
The invention as defined in claim 1 wherein said rough surface texture is formed on both of said interface surfaces.
Claim 6
Dependent Claim
64 words
In a barrel comprising a plurality of cylindrical members in coaxial nested relationship forming interface surfaces therebetween, the addition of induced means for resisting the radial distribution of heat through said barrel, said means comprising a combination of a coating of low thermal conductivity on one of said interface surfaces and a rough surface texture formed on the other one of said interface surfaces.
Claim 7
Dependent Claim
64 words
In a barrel comprising a plurality of cylindrical members in coaxial nested relationship forming interface surfaces therebetween, the addition of induced means for resisting the radial distribution of heat through said barrel, said means comprising a combination of a coating of low thermal conductivity on one of said interface surfaces and a rough surface texture formed on the other one of said interface surfaces.
References Cited (Backward Citations)
US664848A
Cited
GB189407071A
Cited
US930927A
Cited
US1789835A
Cited
US2112144A
Cited
US2137259A
Cited
US3177811A
Cited
US3152548A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |