US2585446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of tubular objects of prestressed concrete
Assignee: Individual
•
Filing: 1946-04-22
•
Granted: 1952-02-12
•
Expires: 1966-04-22
Abstract
No abstract record available.
Inventors
- 👤 Edwin Emil
- 👤 Nilsen Nils Darre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:33
CPC Classifications
B; B28; B28B; B28B21/00; B28B21/02; B28B21/10; B28B21/18; B28B21/20; B28B21/205; B28B21/56; B28B21/60; B28B21/62
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1413405A
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US1471990A
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US1570794A
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US1965748A
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US2048253A
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US2191025A
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US2236107A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-11 | 1955-08-13 | 1956-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-11 | 1959-08-13 | 1960-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-11 | 1963-08-13 | 1964-02-12 | $7700.00 | Window Closed / Lapsed |