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US2647475A
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Knockdown arch structure
Assignee: United States Department of the Army
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Filing: 1950-06-19
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Granted: 1953-08-04
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Expires: 1970-06-19
Abstract
No abstract record available.
Inventors
- 👤 Dietrich Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:22
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/32; E04B1/3205; E04B2001/3235; E04B2001/3241; E04B2001/3252
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US649352A
Cited
AU18626A
Cited
FR652806A
Cited
US1896530A
Cited
CH203898A
Cited
GB525958A
Cited
US2292078A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-03 | 1957-02-02 | 1957-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-03 | 1961-02-02 | 1961-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-03 | 1965-02-02 | 1965-08-04 | $7700.00 | Window Closed / Lapsed |