Patent US1546521A successfully refreshed from Google Patents.
US1546521A
Expired / Lapsed
US
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Cupola furnace
Assignee: Individual
•
Filing: 1924-02-05
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Granted: 1925-07-21
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Expires: 1944-02-05
Abstract
No abstract record available.
Inventors
- 👤 Vanderstein Ewald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:11
CPC Classifications
F; F27; F27B; F27B1/00; F27B1/10; F27B1/16
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) | 1928-07-20 | 1929-01-19 | 1929-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-07-20 | 1933-01-19 | 1933-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-07-20 | 1937-01-19 | 1937-07-21 | $7700.00 | Window Closed / Lapsed |