Patent US2458564A successfully refreshed from Google Patents.
US2458564A
Expired / Lapsed
US
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Cement slab molding machine
Assignee: W E DUNN Manufacturing CO
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Filing: 1947-01-04
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Granted: 1949-01-11
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Expires: 1967-01-04
Abstract
No abstract record available.
Inventors
- 👤 Benjamin G Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:54
CPC Classifications
B; B28; B28B; B28B1/00; B28B1/04; B28B23/00; B28B23/02; B28B5/00; B28B5/02; B28B5/026; B28B5/027
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) | 1952-01-11 | 1952-07-12 | 1953-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-01-11 | 1956-07-12 | 1957-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-01-11 | 1960-07-12 | 1961-01-11 | $7700.00 | Window Closed / Lapsed |