Patent US2490930A successfully refreshed from Google Patents.
US2490930A
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Method and apparatus for forming tubes from sheet material
Assignee: Akzo Nobel UK PLC
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Filing: 1946-08-28
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Granted: 1949-12-13
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Expires: 1966-08-28
Abstract
No abstract record available.
Inventors
- 👤 Donald C Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:41
CPC Classifications
B; B31; B31B; B31B70/00; B31D; B31D5/00; B31D5/0086; B31B2155/00; B31B2155/001; B31B2155/0012; B31B2160/00; B31B2160/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-12 | 1953-06-13 | 1953-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-12 | 1957-06-13 | 1957-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-12 | 1961-06-13 | 1961-12-13 | $7700.00 | Window Closed / Lapsed |