Patent US2878545A successfully refreshed from Google Patents.
US2878545A
Expired / Lapsed
US
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Collapsible cores for concrete pipe
Assignee: Individual
•
Filing: 1954-05-17
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Granted: 1959-03-24
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Expires: 1974-05-17
Abstract
No abstract record available.
Inventors
- 👤 Fred C Lowe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:57
CPC Classifications
B; B28; B28B; B28B21/00; B28B21/86; B28B21/88
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US479451A
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US797173A
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US818158A
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US860144A
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US809504A
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US861106A
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US954696A
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US1171641A
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US2683912A
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US2707814A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-23 | 1962-09-22 | 1963-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-23 | 1966-09-22 | 1967-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-23 | 1970-09-22 | 1971-03-24 | $7700.00 | Window Closed / Lapsed |