Patent US2433036A successfully refreshed from Google Patents.
US2433036A
Expired / Lapsed
US
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Down-draft furnace
Assignee: University of Illinois at Urbana-Champaign
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Filing: 1943-05-14
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Granted: 1947-12-23
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Expires: 1963-05-14
Abstract
No abstract record available.
Inventors
- 👤 Fellows Julian Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:28
CPC Classifications
F; F24; F24B; F24B5/00; F24B5/02; F24B5/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US51649A
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US1807647A
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US1781726A
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US1914476A
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US2295781A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-12-22 | 1951-06-23 | 1951-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-22 | 1955-06-23 | 1955-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-22 | 1959-06-23 | 1959-12-23 | $7700.00 | Window Closed / Lapsed |