Patent US6522994B1 successfully refreshed from Google Patents.
US2320172A
Expired / Lapsed
US
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Tunnel kiln
Assignee: SWINDELL DRESSLER CORP
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Filing: 1939-06-19
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Granted: 1943-05-25
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Expires: 1959-06-19
Abstract
No abstract record available.
Inventors
- 👤 Frank W Brooke
- 👤 Dressler Philip D Huc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:29
CPC Classifications
F; F27; F27B; F27B9/00; F27B9/14; F27B9/20; F27B9/201; F27B9/202; F27B9/205; F27B9/02; F27B9/021; F27B9/022; F27B9/06; F27B9/068
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) | 1946-05-24 | 1946-11-23 | 1947-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-05-24 | 1950-11-23 | 1951-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-05-24 | 1954-11-23 | 1955-05-25 | $7700.00 | Window Closed / Lapsed |