US2687591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rifled gun barrel with tapered chromium bore wall
Assignee: United States Department of the Army
•
Filing: 1949-10-31
•
Granted: 1954-08-31
•
Expires: 1969-10-31
Abstract
No abstract record available.
Inventors
- 👤 Vernon A Lamb
- 👤 Elburt F Osborn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:42
CPC Classifications
F; F41; F41A; F41A21/00; F41A21/22; F41A21/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US660496A
Cited
US1127268A
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US1546895A
Cited
GB238379A
Cited
US1886218A
Cited
US1944883A
Cited
US1997004A
Cited
US2345089A
Cited
GB574010A
Cited
US2395044A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-30 | 1958-03-01 | 1958-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-30 | 1962-03-01 | 1962-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-30 | 1966-03-01 | 1966-08-31 | $7700.00 | Window Closed / Lapsed |