US2544488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for making concrete blocks
Assignee: FINLOK BLOCK Inc
•
Filing: 1948-05-19
•
Granted: 1951-03-06
•
Expires: 1968-05-19
Abstract
No abstract record available.
Inventors
- 👤 Barrett W Chittenden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:31
CPC Classifications
B; B28; B28B; B28B5/00; B28B5/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1453747A
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US965003A
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US1428692A
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US1471990A
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US1554585A
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US1872521A
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US2350934A
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US2402655A
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US2454708A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-05 | 1954-09-04 | 1955-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-05 | 1958-09-04 | 1959-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-05 | 1962-09-04 | 1963-03-06 | $7700.00 | Window Closed / Lapsed |