Patent US1391508A successfully refreshed from Google Patents.
US1391508A
Expired / Lapsed
US
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Mold for concrete blocks
Assignee: JOHN T ZEIDLER
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Filing: 1920-03-18
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Granted: 1921-09-20
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Expires: 1940-03-18
Abstract
No abstract record available.
Inventors
- 👤 Frank A Roosa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:52
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/0002; B28B7/0014; B28B7/0029; B28B7/0035; B28B7/0041
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1924-09-19 | 1925-03-21 | 1925-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-09-19 | 1929-03-21 | 1929-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-09-19 | 1933-03-21 | 1933-09-20 | $7700.00 | Window Closed / Lapsed |