Patent US1541443A successfully refreshed from Google Patents.
US1541443A
Expired / Lapsed
US
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Reversible circulation internal fan kiln
Assignee: Individual
•
Filing: 1925-03-07
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Granted: 1925-06-09
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Expires: 1945-03-07
Abstract
No abstract record available.
Inventors
- 👤 Thelen Rolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:32
CPC Classifications
F; F26; F26B; F26B15/00; F26B2210/00; F26B2210/16
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) | 1928-06-08 | 1928-12-08 | 1929-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-06-08 | 1932-12-08 | 1933-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-06-08 | 1936-12-08 | 1937-06-09 | $7700.00 | Window Closed / Lapsed |