Patent US2520224A successfully refreshed from Google Patents.
US2520224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tube assembly machine
Assignee: Celanese Corp
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Filing: 1944-11-11
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Granted: 1950-08-29
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Expires: 1964-11-11
Abstract
No abstract record available.
Inventors
- 👤 Dimitri G Soussloff
- 👤 Rene P Piperoux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:55
CPC Classifications
B; B31; B31B; B31B50/00; B31B50/74; B31B50/81; B31B2105/00; B31B2105/002; B31B2105/0022
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1201319A
Cited
US1393274A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |